Calcium nitrate in water


Calcium Nitrate Fertilizer 15.5-0-0 (Ammonia Calcium Nitrate 15.5-0-0)

  • Calcium Nitrate enhances uptake of potassium, magnesium, and calcium from the soil, as these are positively charged and fixed in the soil. The negative charge of nitrate releases them from soil and thus promotes their uptake as the solution of calcium nitrate sprayed on leaves to roots also.

  • Nitrate increases soil pH, a combined effect of increased pH and strengthening of cell walls by calcium controls cluck root disease in brassica crops.

  • Foliar spray of Calcium Nitrate fertilizer during critical growth stages prevents bitter pit in apples, end rot in tomatoes and peppers, and flowering and fruit dropping.

Calcium Nitrate Fertilizer Application Rate:

Foliar Application: Mix 2-4 tablespoons per 1 gallon of water and spray the leaves with it.

As a Supplemental (Side Dressing) Fertilizer Application: Apply 1 pound per 100 feet of row (1 cup per 50 feet of row or 1 level tablespoonful per plant). Apply to root growing area. Do not place within 2 inches of stalk or crown of plants. Do not allow contact with wet foliage.

On Apples: Ground application broadcast under the tree. Use at a rate of 1/2 pound for each year of tree growth to a maximum of 8 pounds per tree. Apply in February or apply in split applications in February and October.

NOTE: Calcium Nitrate may be used as a foliar spray as an aid in the reduction of blossom end rot in tomatoes and peppers. Apply with cover sprays every other week until 2 or 3 weeks before harvest using 3 pounds per hundred gallons of spray. Calcium Nitrate is compatible with most insecticides and fungicides used on vegetables, floral crops and fruit crops. Do not use in combination with sulfates.

Related Blog Posts:

  • What’s the function of Nitrogen (N) in plants?
  • What’s the function of Calcium (Ca) in plants?


  • Safety Data Sheet

Frequently Asked Questions:

  • Ammonium Calcium Nitrate (Calcium Nitrate) Fertilizer 15.5-0-0

How much calcium nitrate should I add to 32 fl. oz. of water?

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Calcium nitrate is mainly produced as a fertilizer, used for plant nutrition purposes, and for wastewater treatment. It is a source of both calcium and nitrogen, for plants.


Calcium nitrate is a very soluble compound with a solubility of 172 oz/gal in 68◦ F, and it is widely used in fertigation. In various places, it is also available in a solution form.

The formula of calcium nitrate is Ca(NO3)2 and it is manufactured by one of the following processes:

1. Reacting limestone with nitric acid, 2. reacting phosphate rock with nitric acid or, 3. reacting ammonium nitrate with calcium hydroxide.
In 2015, the global calcium nitrate market was 15,215 metric tons. Asia Pacific had the largest market share, 54.6%, where North America was second, with a market share of 18.5%.

The increasing demand is driven by the rising demand for grain crops and for wastewater treatment.

Nitrogen is a macro element, required by plants in large quantities. It is a building block of the chlorophyll and of amino acids.

Calcium is an important component of the cell walls and proper supply of calcium is essential to plant development. It improves fruit quality, shelf life, strengthen the cell wall and helps protecting the plant from stress and diseases.

Calcium moves in plants only up from the roots, with the water flow, and is immobile once incorporated in plant tissue. Therefore, a constant supply is required.


Some popular commercial calcium nitrate fertilizers, include:

YaraLiva Tropicote – a granular fertilizer, containing 15.5% nitrogen and 19% calcium.

YaraLiva CN-9 – a liquid solution, containing 9% nitrogen and 11% calcium.

YaraLiva Calcinit – a water soluble fertilizer, specific for fertigation, containing 15.5% nitrate nitrogen and 19% calcium.

Haifa Cal, Haifa Group– a water soluble source of calcium nitrate, containing 15.5% nitrate nitrogen (14.4% nitrate nitrogen, 1.1% ammonium nitrogen) and 19% calcium.

Ultrasol calcium, SQM – a water soluble fertilizer, containing 15.5% nitrate nitrogen and 18.8% calcium.

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Calcium Nitrate with Boron


Calcium Nitrate with Boron : (15.5% N + 18% Ca + 0.3% B) is a field grade calcium nitrate fertilizer, with added boron suitable for field application to all crops especially brassicas which are more prone to calcium and boron deficiency.

Calcium and Boron are the most important nutrients that are vital for the growth, physical strength, flowering fertilization and fruit set of the plants. Their deficiency cause heavy losses both qualitatively and quantitatively.

Application of calcium nitrate with boron keeps the soil healthy and nourished and gives the plant the best chance for excellent growth.


  • Highly water soluble. Ideal fertilizer for both soil and foliar applications.
  • Contains dual nutrients calcium and boron important for fruits and vegetables. Cures Calcium and boron deficiency in the crops quickly.
  • Increases uptake of other nutrients and provides uniform shape and color to produce.
  • Improves soil health and creates favorable environment for friendly micro organisms.
  • Improves the strength of cell wall and plant growth.
  • Improves crop’s and product’s luster quality and storage longevity.
  • Improves tolerance to diseases, pests and environmental stress such as drought, flood, water logging, excessive heat, frost etc.
  • Increases yield both qualitatively and quantitatively.

A top dress liquid fertiliser that provides nitrogen and calcium nutrition for vegetables, fruits, vines, flowers, turf and ornamentals.


The nitrogen in calcium nitrate is fully available to plants and provides an immediate and predictable growth response.
The calcium helps to reduce plant disorders such as bitter pit of apples, blossom end rot of tomatoes and capsicums, hollow heart of brassica crops, and assists in reducing tip burn of lettuce.
Calcium is an essential nutrient for development of all plant tissues and an adequate supply and uptake assures a longer shelf life for all horticultural crops.

Aqua-Fert Calcium Nitrate cannot be lost to the atmosphere like urea or ammonium based
fertilisers and:

– Is not affected by temperature, so nutrients are still available when conditions are cold & wet

– Does not contain harmful chlorides or heavy metals

– Is not acidifying to the soil


Aqua-Fert Calcium Nitrate can be the major nitrogen source in a fertiliser program or strategically used at specific times in the development of crops, in conjunction with other fertilisers.

Aqua-Fert Calcium Nitrate can be applied through the fertigation system, as a foliar spray and can also be used in hydroponic systems.

Calcium Nitrate is particularly suitable as a post harvest application on stone fruit, pome fruit and vines, where it is important to achieve the best flower quality, fruit set and early fruitlet development the following season.


General rates for horticultural crops are between 25 to 70 L/ha through the fertigation system. When applying Aqua-Fert Calcium Nitrate through the irrigation system more frequent and smaller applications guarantee the nutrients are supplied to the plants without being lost due leaching or excessive rainfall. General foliar application rates are at a concentration of 0.5-1%. The actual rates, number of applications and their timing will vary considerably for different crops and for different districts. Before application, seek advice from your Campbell’s Aqua-Fert Calcium Nitrate distributor or your local agronomist.

Calcium Nitrate Alternatives In Hydroponic & Fertigation Systems

Calcium Nitrate is an inorganic compound with the formula Ca(NO3)2 and is mainly used as a component in fertilizers.

In soil and plant nutrition Calcium is King. Calcium Nitrate is the only cheapish non-reactive water soluble calcium fertilizer suitable for drip feeding fertigated crops, so it goes without saying that calcium nitrate is the sovereign of fertilizers. There are NO realistic, long term alternatives. Sadly, Kenyan (and Ugandan) growers have encountered a glitch in Calcium Nitrate supply due to port delays (October 2018). A long delay in clearing containers (and the extra costs) have resulted in lower availability and higher prices.

What can Kenyan growers do? As already mentioned, there are no direct alternatives to Calcium Nitrate, so we are going to have to be brave, innovative and move into untested waters…….

Calcium In The Soil

Calcium is not called the King of nutrients for nothing. Calcium is very important for soil health, microbial diversity, soil structure, heavy metal protection and countless other soil properties. As a soil amendment, we do have alternatives. Soil growers that are following our soil health program and balancing calcium and pH levels at planting, and annually, should have adequate Calcium levels in their soils, which will hold them in good stead through this crisis. They will be able to “mine” their soil Calcium and top it up with topdressing of Gypsum, Calcitic lime or dolomitic lime (depending on the soil test result recommendations).

Calcium In Hydroponics

Hydroponic growers are no so lucky. At planting growers should condition their media with gypsum, lime, calmag to bring up the calcium levels to optimum at the start – but the amount the media can store is very limited and the calcium very quickly (in a matter of days!) runs out. The whole concept behind hydroponics is to be able to have a system of nutrient feeding that can be changed at the drop of a hat…

Calcium In Plant Nutrition

Calcium is an essential secondary plant nutrient, and typically supplied in nutrient solutions at a rate of 80-240 ppm. Crucial for plants, Calcium also prevents various other nutrient deficiencies and is an essential ingredient of strong cell walls which leads to sturdier crops with increased vitality and storage properties (critical for exported crops that need to reach their destination in good form!).

Calcium is deposited as calcium pectate in the cell walls. This means it is not mobile in the plants and cannot be moved from older tissue to younger tissue, it is therefore needed all the time. Important for all plants – Calcium is especially important in roses, tomatoes, peppers, brassicas and cuttings.

Calcium enables the uptake of other nutrients. It is important for root cell division and cell strength. Low levels of calcium in root tissue make the roots susceptible to soil borne diseases and nematodes. Without root division phosphorous uptake slows down.

Calcium is important for the stability and functioning of cell membranes. When Calcium supply slows down the cell membranes become leaky, and cell division is disrupted – causing twisting and cupping of the newer foliage. Leaky membranes are more susceptible to pre-harvest diseases and post-harvest botrytis and bruising.

Calcium slows the ageing of cells by protecting them from toxins and ethylene – hence its importance in maintaining quality and shelf life. For cuttings producers – ample calcium levels are vital -not just for shipping, but also in root cell formation for rooting.

Because it is immobile, calcium deficiency occurs in the newest growth, and symptoms include tip burn in leafy crops, and blossom end rot of tomatoes and capsicum. Softer ‘leaky’ cell membranes are more susceptible to spray damage and heat stress.

Calcium deficiency symptoms vary according to plant type, variety, degree of severity of the calcium deficiency and growing conditions. At the onset symptoms are difficult to spot, and it is important in this difficult time, to monitor calcium levels with regular leaf analysis.

By the time Calcium deficiency expresses symptoms, cupping of new foliage, pale marginal bands, increased spray damage, diseases and insect pressure, water-soaked areas on stems and leaves and root tips that become jelly like, yield and quality will have been affected beyond repair.

Keep a close eye on your flower and vegetable shelf-lives. It’s not just the cells on the outside that are affected, Calcium deficiencies affect the inside cells too. Look out for black heart in lettuces, empty cabbages, browning inside of flower buds, browning in cut beans, pithy baby corn.

Optimum levels of Calcium in leaves vary from plant to plant, but typically fall in the range of 0.8-2%. The age of the leaves for sampling is important – because it is immobile older leaves will generally not show a deficiency. Hence the need for sampling the youngest most mature leaves for leaf analysis – in roses this would be the 3-4 leaf down on roses showing color. Calcium deficiency can cause loses of > 50%! So, it is important to stay on the ball.

Boosting Calcium Uptake

Optimizing Calcium nutrition in a crop is not just a matter of dosing correct levels. Calcium uptake is complex and often misunderstood. Soils, media and nutrient solutions generally have enough Calcium levels and many Calcium deficiencies are induced deficiencies.

Environmental factors, crop factors, solution management, moisture levels and elemental ratios all interact to affect Calcium uptake. Understanding the factors that affect Calcium uptake will help us maximize the limited calcium we have and will influence our choice of replacement fertilizers.

Optimizing transpiration

Calcium uptake is a passive process and Calcium moves into the root and through the plant in water movement driven by the transpiration stream through the xylem. So, it goes without saying that anything that factors that influence transpiration will affect the uptake of calcium.

  1. High light levels, lower humidity, warmer climate, air movement, optimum moisture in the root zone, growing out of flush all promote Calcium uptake.
  2. Dry roots, high humidity, thick plant growth, cold weather, low light levels, excess spraying (closed stomata), some silicate and oily products (blocked stomata) reduce calcium uptake.
  3. Optimum Copper and Potassium are required for xylem strength and translocation efficiency. Low levels induce premature wilting & reduced calcium uptake
  4. Excess Nitrogen promotes very fast soft growth – inducing Calcium deficiency through wilting and increasing the amount of growth the Calcium needs to satisfy.
  5. High soil temperatures promote Potassium uptake and reduce Calcium uptake – mulch / cover the soils.
  6. Flowers and fruits have a lower transpiration rate and will be the first to be affected by Calcium deficiency – hence blossom end rot in tomatoes and peppers.
  7. When humidity is too low –transpiration is high and Calcium will be deposited more quickly in the lower leaves resulting insufficient levels remaining for the upper leaves and flower buds.
  8. In very low humidity, in the hottest part of the day, with dry soils, flooded soils, high salinity, plants can shut down their transpiration by restricting the xylem, closing the stomata and turning their leaves – Zero calcium uptake happens then.

Warm, humid conditions combined with limited airflow and rapid growth are known as ‘calcium stress periods’ and result in tip burn & death of growing points (blind shoots).

Optimize moisture levels

Plants take up less water, and therefore Calcium from dry root zones. EC builds up around dry roots creating an osmotic stress, reducing water and calcium uptake. Flooded roots have no oxygen and shut down = no calcium uptake. Optimum moisture = optimum root activity = optimum Calcium uptake. If you haven’t got one, get a moisture sensor like Aquacheck, and use it to guide you on your irrigation cycling.

Balance your pH’s

pH has a big effect on Calcium availability and uptake. Low pH increases the solubility of metallic cations which depress Calcium uptake. At high pH calcium is bound up as an insoluble carbonate (Lime), and acidic conditions are required to neutralize the carbonate and release the Calcium.

When planting in the soil do a complete soil analysis at the the start. Scientifically calculated additions of lime / dolomitic lime, gypsum or sulphur will help balance your soil pH and optimize Calcium levels. For media, analysis and pre-conditioning of media will balance media pH. Cocopeat and pumice can contain large amounts of Sodium and Potassium and absorb large amounts of Calcium and Nitrogen. Conditioning needs to be done pre-planting.

The irrigation water quality, amount of acid and ratio of nutrients all affect the immediate and long-term pH in the root zone.

Balance your soil Electrical Conductivity (EC)

At low ECs plants struggle to take up any nutrients. High ECs in the root zone cause osmotic stress, reducing water and Calcium uptake. Take extra care in maintaining the optimum EC in the root zone. Note that drip & drain analysis in hydroponics can be misleading with regards to EC levels in media, a phenomenon known as false drain.

Monitor EC in the root zone with regular sampling for a 1:1.5 media analysis, or a 1:2 soil analysis. Samples should be taken fresh, not dried out, and shipped to the lab as soon as possible and not over the weekend. Analysis is time and moisture sensitive. Sending samples in absorbent bags (eg paper) will suck out the moisture and give a false high reading.

EC in the root zone is a balance between EC soil/media, of drip and the water uptake of the plants.

Balance your nutrient levels

Most well-balanced nutrient solutions at the correct EC range contain enough calcium for optimum uptake. Balance is the key here.

  1. Copper and Potassium deficiencies cause premature wilting, lowered translocation and reduced Calcium uptake.
  2. High Sodium & Potassium in the root zone compete for uptake with calcium AND translocation of Calcium to the growing tips, a common cause of tip burn.
  3. Calcium and Magnesium are opposed in the plant system and have antagonistic interactions. High Magnesium competes with Calcium and induces phytotoxicity in plants
  4. High Aluminum, Iron and other trace metals, are also cations, & compete with calcium for uptake.
  5. High bicarbonate levels in irrigation water bind with Calcium to form insoluble lime, taking it out of the nutrient solution. These should be neutralized with correct acid dosing.
  6. The Nitrate to Ammonium ratio is important. Calcium Nitrate is important as a Nitrate source especially for hydroponics. It is highly soluble and rapidly taken up by the root system. While a small proportion of Ammonium in the root zone helps boost growth in alkaline conditions and in low light and temperature, Ammonium is also a cation (NH4+) and significantly aggravates Calcium uptake and should be reduced to zero in hot weather and rapid growth conditions.
  7. High Phosphates can bind with Calcium, forming an insoluble precipitate, removing both calcium and phosphorous from the roots’ reach.
  8. High Sulphates combine with Calcium to form Gypsum – which has a limited solubility.
  9. Calcium and Boron go hand in hand – low or high Boron levels have a huge impact on Calcium uptake and use!

Root health

The health of the root system plays a vital role in calcium uptake. Root diseases, nematodes, water logged roots, anaerobic root zones all restrict calcium uptake. Run regular nematode and root borne disease checks.

Next, we will discuss calcium nitrate alternatives.

Calcium Nitrate Alternatives

As mentioned earlier, there are no water soluble, non-reactive Calcium Nitrate alternatives that you can throw into your fertigation recipes as a direct replacement. So here I will list some of the options available for Calcium to boost Calcium levels.

NOTE FIRSTLY that Calcium Nitrate brings a huge contribution of nitrates into your fertigation recipe. This is a major essential nutrient and the first thing any grower should do when removing calcium nitrate from their recipe is ensure that the N level is topped up via Ammonium sulphate, MAP, potassium nitrate and magnesium nitrate sources. Nitric acid is also a very good source of N, when balanced with lime or bicarbonates.

Without the Calcium in soluble form the EC in the recipe can come down – it will be balanced by the topdressing. When balancing the Nitrogen – bear in mind that ammonium can be very acidifying AND is a cation – so competes with Calcium uptake. Ideally you need to apply the Nitrogen in nitrate form.

1. Limestone

There are two types of lime.

  1. Calcitic lime or agricultural lime should have a calcium content of >35% and magnesium content of below 1%
  2. Dolomitic lime has a calcium content of 20-24% and a magnesium content of 10-14%.

Lime comes in dust form and can be hard to measure and messy to apply. It is generally mined in Kenya and therefore cheaper and more easily available than imported limes. The Calcium Carbonate Equivalent (CCE) of a good lime should be >70%. It is determined by quality and the fineness of the lime. The finer the lime, the faster it will react with the soil – releasing Calcium and taking the pH up. Large lumps are every unreactive and have little agricultural value. Quality varies according to the source and subsequent milling – it is good to check the lime quality before you apply it.

Lime is Calcium and Magnesium Carbonate. Lime adds add Calcium and Magnesium to the soil and the carbonate reacts with acids in the soil (like H+) to increase up the soil pH. Lime can be used in acidic soils, the amount required is determined from a complete soil analysis – which takes into account the pH, H+, Ca2+, other cations and soil CEC (heaviness) in a scientific way to balance pH and cations properly.

Applying too much lime is called over-liming and increases the soil pH. At high soil pH many nutrients get locked up and plants start yellowing. The high soil pH can be counteracted with acidic drip water or acidic fertilizers like Ammonium Sulphate. Nitric acid is preferred to bring in the extra Nitrates that are missing from the Calcium Nitrate application.

Sulphuric acid can work and is cheap, but has two downsides. One it is very dangerous to handle and is not allowed by some certificates. Sulphuric acid brings in excess sulphates that may temporarily tie the Calcium up as semi-soluble gypsum. Phosphoric acid can bring in too much phosphates that will tie up Calcium and iron.

Lime calcium nitrate reaction

2HNO3 + CaCO3 —–> Ca(NO3)2 + H2O + CO2

Calcitic lime reacts with Nitric acid to produce Calcium Nitrate, water and carbon dioxide. Amounts depend on the strength of the acid and the quality of the lime.

Generally, standard limes may not react fast enough to supply enough Calcium. For hydroponics you need a more readily available calcium source. Soil is more buffered and as long as there is enough Calcium in the soil – it is just a matter of regularly replacing plant removals by top dressing.

2. Micronized Limes

Granulated micronized limes are more expensive due to the additional processing & they are imported. But they are much easier to measure out and apply & there is less dust. The granules collapse when wet and the micronized lime particles quickly move into root zone and dissolve fast. So, they deliver calcium faster – but they also change the pH faster.

An idea would be to top dress the granules at the calculated rate of weekly calcium application (from your weekly Calcium Nitrate application per ha). For hydroponics you would apply a smaller rate more often and closely monitor with media and drain analysis until you get a balance.

Closely measure pH and counteract the alkalinity with extra acid and or acidic fertilizers. Always take your water quality into account. High bicarbonate water needs to be neutralized. Granulated limes include Calciprill and Magprill from Omya (Lachlan), G Lime from Amiran, Liquid lime from Dudutech.

3. Gypsum

Gypsum contains Calcium Sulphate. It is available locally and relatively in-expensive. It should be tested as the quality varies from source to source. It is only sparingly soluble in water at a rate of about 2.2 g/liter. It does not affect the pH directly but can cause an increase in EC and sulphates.

Normal gypsum is fine for top dressing soils if you have enough calcium in your soil profile and are just topping up the plant removals. There are also micronized and ‘soluble’ gypsum products that will move into solution much faster and would be more suitable for hydroponics. Ezy Flow Gypsum from Dudutech is a micronized liquid gypsum that can be drenched.

Application of lime and gypsum

Solid lime and gypsum products should not be applied via drip – they are very insoluble and will block your irrigation system. They should be sprinkled on the surface between the plants and watered in with a showerhead on a hose. The drip water will then pick them up and move them through the profile. Liquid gypsum and lime products should be applied alone as a drench as the last irrigation of the day.

4.Calcium Ammonium Nitrate

Calcium Ammonium Nitrate (CAN) is not fully soluble and only suitable for top dressing. It is hygroscopic and quickly dissolves in absorbed water from the air, and then can move into the soil/media. Fertilizer grade CAN contains roughly 8% calcium and 21-27% nitrogen.

It is less acidifying than Ammonium Sulphate and brings some Calcium into the equation. It tends to have about 13% nitrate and 13% ammonium ions. It should be used sparingly and only after trials in your system. Ammonium ions compete with Calcium ion uptake and can cause a rapid soft growth flush.

5. Other Calcium Products

Mainstay Calcium

This is a micro-encapsulated liquid calcium that can be drenched and remains available in the soil solution for a long time – manufactured by Cosmocel, available from Ocean. (20% Calcium) (no sulphates, nitrates, carbonates or chlorides).

ICL have a range of fertilizers suitable for topdressing that contain varying levels of calcium and other nutrients. (Agroleaf Power Calcium 11-5-19+9CaO+2.5MgO+TE, Nutrivant calcium 12-5-27+8CaO+TE, Polysulphate – 17%CaO).

ETG Kynoplus Nafaka 18-38-0+5S+2.3Ca+0.2MgO, Kynoplus Horti 15-9-21+4.75S+2.9Ca+1.5MgO.

Apply calcium drenches as the last cycle of the day to get maximum uptake in your plants.

Calcium Foliar Sprays

There are also many different foliar sprays to boost calcium levels in the plant. Note that Calcium moves through the xylem – up the plant, very little is moved in the phloem down to the roots. You always need some Calcium in the root zone. Green flower buds and fruit (eg tomatoes) – have less stoma and tend to be at the ends of the stems – concentrate foliar sprays here for better uptake.

Foliar sprays don’t just contain Calcium – look at the other ingredients too. Some foliar sprays are designed for 1-2 sprays in an orchard/coffee plantation per season and contain high boron or zinc and are not suitable for weekly spraying. ALWAYS read the label and do a phytotoxicity test first. (OmyaPro calcium is a 35% Ca pure calcium foliar). Calcium foliar sprays must be applied regularly and concentrate on the new growth.

Always consider the whole picture when it comes to nutrient application – add up the irrigation water / fertigated nutrients and topdressing nutrients and keep a balance.

Case Study – 20 ha Roses Grown In The Soil

Complete soil analysis at planting and addition of scientifically calculated lime and gypsum to balance calcium levels in soil. 500 kg calcium nitrate is used in fertigation daily over 20 ha.

The fertigation recipe is adjusted to reduce Calcium nitrate by 50%, using Potassium Nitrate and Magnesium Nitrate to increase the Nitrate levels and lower the Sulphate levels in the fertigation program. The balance of N is added as urea. The N:NH3 ratio in fertigation kept below 20% N:NH3. The EC is reduced. The ppm N in the final drip water remains constant.

250 kg/day /20 ha calcium nitrate reduction = 3500 kg/20 ha/ 14 days. ie 175 kg CaNO3 per ha per 2 weeks (34 kg calcium). This works out as a topdressing of 150kg/ha gypsum (225 Ca) every two weeks, sprinkled on and washed into the soil with showerheads.

Monitor available nutrients with a 1:2 soil analysis every month and leaf nutrients levels with a leaf analysis every two weeks & adjust feeding program until the situation has stabilized.

To source lime / gypsum / calcium fertilizers and foliar feeds please visit . To adjust recipe’s, test soils / hydroponics or leaves please contact us on

Happy farming!

About Ruth

Ruth Vaughan is the Technical Director at Crop Nutrition Laboratory Services Ltd. (CROPNUTS). Ruth is also a contributing author to Kenya’s leading horticulture magazines such as the HortFresh Journal, HortiNews and Floriculture. Ruth is a great believer in soil health, organic matter, biochar and carbon sequestration as a way to alleviate climate change and increase food security. Loves visiting farmers and seeing all the different farming methods

Calcium Nitrate Fertilizer – What Does Calcium Nitrate Do For Plants

Providing the correct amount of nutrients to your plants is crucial to their health and development. When plants don’t have enough of a certain nutrient, pests, disease and low bearing are often the result. Calcium nitrate fertilizer is the only water soluble source of calcium available for plants. What is calcium nitrate? It works both as a fertilizer and for disease control. Read on to learn how to use calcium nitrate and decide if it will be useful for you in your garden.

What is Calcium Nitrate?

Diseases like blossom end rot are easy to control with calcium nitrate. What does calcium nitrate do? It provides both calcium and nitrogen. It is usually applied as a dissolved solution, allowing for quicker plant uptake but may also be applied as side or top dressing.

Ammonium nitrate is a commonly used source of nitrogen but it interferes with calcium uptake and causes calcium deficiency disorders in plants. The solution is to apply calcium nitrate instead to any crop that has a tendency to develop calcium deficiency disorders.

Calcium nitrate is produced by applying nitric acid to limestone and then adding ammonia. It is known as a double salt, since it is comprised of two nutrients common in fertilizers which are high in sodium. The processed result also looks crystallized like salt. It is not organic and is an artificial fertilizer amendment.

What does calcium nitrate do? It helps with cell formation but it also neutralizes acids to detoxify the plant. The nitrogen component is also responsible for fueling protein production and essentially leafy growth. Heat and moisture stress can cause calcium deficiencies in certain crops, like tomatoes. This is when to use calcium nitrate. Its combined nutrients can help cell growth stabilize and fuel leafy development.

When to Use Calcium Nitrate

Many growers automatically side dress or top dress their calcium sensitive crops with calcium nitrate. It is best to do a soil test first, as excess calcium can also lead to problems. The idea is to find a balance of nutrients for each particular crop. Tomatoes, apples and peppers are examples of crops that may benefit from calcium nitrate applications.

When applied early in fruit development, the calcium stabilizes cells so they don’t collapse, causing blossom end rot. Meanwhile, the nitrogen is fueling plant growth. If you are an organic gardener, however, calcium nitrate fertilizer is not an option for you since it is synthetically derived.

How to Use Calcium Nitrate

Calcium nitrate fertilizer can be used as a foliar spray. This is most effective in treating and preventing blossom end rot but also cork spot and bitter pit in apples. You can also use it to treat magnesium deficiencies when it is combined at a rate of 3 to 5 pounds magnesium sulfate in 25 gallons of water (1.36 to 2.27 kg. in 94.64 liters).

As a side dress, use 3.5 pounds of calcium nitrate per 100 feet (1.59 kg per 30.48 m). Mix the fertilizer into the soil, being careful to keep it off of foliage. Water the area well to allow the nutrients to start seeping into soil and get to plant roots.

For a foliar spray to correct calcium deficiency and add nitrogen, add 1 cup of calcium nitrate to 25 gallons of water (128 grams to 94.64 liters). Spray when the sun is low and plants have been watered sufficiently.


Calcium Nitrate has an analysis of 15.5-0-0 19% Ca and it’s derived from reacting a derivative from the atmosphere. They pull out nitrate acid from the air and they react nitrate acid with the limestone and that is what gives calcium nitrate. So it’s basically derived from limestone and the atmospheric nitrogen.

Most of the production of calcium nitrate that’s dry is done in Norway, they’re the largest producer of calcium nitrate. They have a lot of hydroelectric power from waterfalls, etc. and cheaper electricity and they have limestone deposits and that’s where calcium nitrate is derived from.

Calcium nitrate is considered as a commercial fertilizer and as a result it is not approved for organics. As far as its application, it’s a double growth energy fertilizer which means the calcium causes growth in plants and so do the nitrates. This is in contrast to something that would be promoting reproductive energy for say flowers and fruit.

It’s a very useful product. It’s applied very well in turf, it’s used quite a bit for forages and pastures. In pasture situations a lot of times we’ll have 200 lbs. applied per acre in the spring, 200 lbs. in mid-summer and that will cause the grass to grow very well.

Calcium nitrate has some very nice properties. It pulls moisture out of the air and into the soil, so it’s excellent for increasing the moisture content in soils just from that effect. The dry comes in two versions. One is a coated and one is a technical grade or greenhouse grade crystals.

The problem with calcium nitrate is that it pulls moisture, therefore if it’s not coated, it’ll pull moisture into the product and get it moist and soupy. So in order to prevent that, they coat the granules of calcium nitrate with a tallow or a wax, it’s like a fat that prevents the moisture from coming through the product. Now once you put it out and apply it out on the soil, it begins to break down and it works fine. But this just helps to prevent that, so when you’re ordering you have to know whether you want to liquify or not. The cheapest of the two is to get the coated calcium nitrate.

The technical grade, or the crystals, is usually provided only in 50 lb. bags. These could be stacked up on a pallet. But this would be if you want to liquify it, put it down a drip line as a calcium nitrate or use it to liquify and make a foliar spray or whatnot. But you can make a liquid calcium nitrate with the technical grade.

Calcium nitrate’s very useful in crops like lettuce, spinach, cabbage, cauliflower, broccoli, celery, things of that nature give great response to calcium nitrate.

If you need any manufacturing formulations and production methods about
any liquid and solid calcium fertilizer,





is enough.

This encyclopedia has many formulas about NPK fertilizers,NP fertilizers,liquid poliar fertilizers, powder fertilizers, granulas fertilizers, micro nutrients fertilizers,macro nutrients fertilizers,chelated fertilizers etc.

All chemical fertilizers in the encyclopedia are producible easily.You need no help and no technıcal support. The encyclopedia is enough to produce chemical fertilizers itself.





is written clear and understandable.

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Calicum nitrate

Author: Amelie Stahlbuhk
back to Nitrate

Calicum nitrate
Mineralogical name Calcium nitrate
Chemical name Calcium nitrate
Trivial name
Chemical formula Ca(NO3)2
Other forms Ca(NO3)2•2H2O (Calcium nitrate dihydrate)
Ca(NO3)2•3H2O (Calcium nitrate trihydrate)
Ca(NO3)2•4H2O (Nitrocalcite)
Crystal system
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C
Density (g/cm³) 2.483 g/cm3
Molar volume 66.09 cm3/mol
Molar weight 164.09 g/mol
Crystal habit
Phase transition
Chemical behavior
Crystal Optics
Refractive Indices
Optical Orientation
Used Literature
Title: Thermodynamic properties of minerals and related substances at 298.15 K and 1 bar pressure and higher temperatures
Author: Robie R.A., Hemingway B.S.; Fisher J.A.


In this page, the calcium nitrate salt is discussed. Its behavior regarding solubility and hygroscopicity will be reviewed as well as its different hydration states.


Figure 1: Solubility of calcium nitrate in water. The molality m is plotted against the temperature.

Under standard conditions the tetrahydrate of calcium nitrate Nitrocalcite is the stable phase. With its relatively high solubility in water it is a highly soluble salt. The temperature dependence of the solubility is shown in the solubility diagram, where in parts the solubility increases extremely with increasing temperature. The dehydrations to the Trihydrate, Dihydrate and at least to the anhydrous calcium nitrate take place at 43 °C, 49.5 °C and 51 °C, respectively.


Figure 2: Deliquescence behaviour of calcium nitrate in the temperature range from -30 to 80 °C. The water acitivity aw is plotted against the temperature.

Calcium nitrate and its phases are hygroscopic salts. At a temperature of 25 °C the Nitrocalcite has a deliquescence humidity of about 50 %. The phase transitions to the other two hydrated forms and to the anhydrous calcium nitrate occur at relative humidities of 22 %, 13 % and 9 %, respectively.




When applying fertilizers through the irrigation water (fertigation), it is essential to be familiar with some important facts regarding fertilizers solubility.

Solubility of a fertilizer – The solubility of a fertilizer is defined as the maximal amount of the fertilizer that can be completely dissolved in a given amount of distilled water at a given temperature.

Manufacturers may provide you with solubility data of their fertilizers upon request. Here is an example of solubility data of various fertilizers (expressed in g/liter):

Solubility g/l
Fertilizer / Temperature (C˚) 5 10 20 25 30 40
Potassium nitrate 133 170 209 316 370 458
Ammonium nitrate 1183 1510 1920 . . .
Ammonium sulfate 710 730 750 . . .
Calcium nitrate 1020 1130 1290 . . .
Magnesium Nitrate 680 690 710 720 . .
MAP (Mono Ammonium Phosphate) 250 295 374 410 464 567
MKP (Mono Potassium Phosphate) 110 180 230 250 300 340
Potassium chloride 229 238 255 264 275 .
Potassium sulfate 80 90 111 120 . .
Urea 780 850 1060 1200 . .

Different manufacturers may provide slightly different solubility data for the same fertilizer. This is because they use different additives in their products. There are also some fertilizers that may contain insoluble residues.


When you dissolve a fertilizer, you should not exceed its solubility. Otherwise, a precipitate may form and might clog the irrigation system. Moreover, the nutrients you intend to provide through the solution may not be fully available.

For example, according to the data in the table above, the solubility of Potassium Nitrate in 20oC is 209 g/l and the fertilizer contains 38% Potassium. If you attempt to dissolve 300 g/l in the fertilizer stock tank, you will not get 114 g/l of Potassium (38% of 300g), but only 80g. The remaining 34g will precipitate and will not be available.


When mixing fertilizers that contain a common element (for example potassium nitrate together with potassium sulphate) the solubility of the fertilizers is decreased. In such case, we cannot refer to the fertilizer solubility data alone. The same happens when the water used for dissolution is highly rich with minerals, e.g. calcium, magnesium or sulphate.

In such cases, additional chemical reactions come into play, and calculations become more complex. Usually, these are not calculated in the field and instead, trial-and-error practices are common.


Some fertilizers should not be mixed together in one stock tank because an insoluble salt might form very quickly. An example for such incompatibility is mixing fertilizers that contain calcium with those that contain phosphate or sulphate.

Use this fertilizers compatibility chart:

Click on image to enlarge it


We’ve established that when mixing fertilizers, one must be familiar with the solubility data of the fertilizers used, as well as with the chemical reactions that may take place. In order to avoid unwanted precipitates, a common recommendation is to perform a “jar test”. In this test, the fertilizers are initially mixed in a jar containing the same water used for irrigation.

Complete dissolution Formation of a precipitate
The fertilizers should be mixed exactly in the same concentration as intended to be used in the stock tanks. If a precipitate forms or if the solution has a “milky” appearance, the test should be repeated with lower concentrations of the fertilizers.

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