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Magnisal™ - magnesium nitrate fertilizer for healthy crops

Magnisal™ / Haifa MAG™ magnesium nitrate fertilizer provides plants with readily-available magnesium, which is essential for their healthy growth


The nitrate in Magnisal™ facilitates the uptake of magnesium by the plant, thus improving its efficiency. It also enriches plant nutrition with readily available, easily absorbed nitrogen.

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Magnesium is essential for the plant

Magnesium is a vital nutrient for healthy plant growth. It is a key component of the chlorophyll molecule, hence essential for photosynthesis and formation of carbohydrates. Magnesium is involved in enzymatic reactions and assists in generation of energy. Magnesium deficiency retards plants development, resulting in decreased yields and poor quality.


Deficiency symptoms

Magnesium deficiency is manifested by yellow bands between leaf veins. The symptoms show first on older leaves, and move towards young leaves as deficiency worsens. In severe cases, necrosis may appear.


Magnesium deficiency in plants



The benefits of Magnisal™ - magnesium nitrate fertilizer

  • Prevents and cures magnesium deficiencies
  • Consists of 100% plants nutrients
  • Free of chloride, sodium and other detrimental elements
  • Dissolves quickly and completely in water
  • Ideal for efficient applications by fertigation and foliar spray


Magnisal™ is a superior source of magnesium

Magnesium nitrate is superior to magnesium sulfate fertilizers. It possesses higher nutritional value and better physical properties that make it more convenient for handling and application.


Plant nutritional value

Plants absorb the magnesium from Magnisal™ more readily, due to the interaction between the magnesium and the nitrate anion. Magnisal™ is up to three-fold more effective than magnesium sulfate in preventing and curing magnesium deficiencies, and therefor enables considerably lower
application rates.


Magnisal™ magnesium nitrate formula

Product analysis


Total nitrogen (N)11.0%
Nitrate-nitrogen (N-NO3)11.0%
Magnesium oxide (MgO)16.0%
Magnesium (Mg)9.6%
Insoluble matter200 ppm
Bulk density0.7 g/cm³
0.4 Oz/In.³


Water solubility

Magnisal™ is extremely soluble in water. It dissolves quickly and does not form precipitate, even at low temperatures.


Water temperature (°C)010203040
Grams Magnisal /liter17302000225025602890
Water temperature (°F)32506886104
Lbs Magnisal/gallon14.416.718.821.424.1


pH and EC

Magnisal™ is slightly acidic, which improves its absorption by leaf surface when sprayed, and enables tank-mixing with chelated nutrients and pesticides. The electrical conductivity (EC) of Magnisal™ solution is low, compared to other fertilizers.


Concentration (%)Lbs/100 galpHEC (mS/cm)


Physical and chemical properties

Magnisal™ is fully soluble in water. It is approximately ten-fold more soluble than Magnesium Sulfate:


 MagnisalMagnesium sulfate (Epsom Salt)
Solubility at 20°C2250 g/l252 g/l
68°F18.8 lbs/gal2.1 lbs/gal
Insoluble matter300 ppm3000-5000 ppm
Compatibility with calcium fertilizersCompatibleIncompatible


Nutrigation™ with Magnisal™

Nutrigation™ (fertigation), delivery of pure plant nutrients through the irrigation system, is a highly efficient application method, enabling full control over rates, composition, timing and placement of plant nutrition.

Magnisal™ is ideal for Nutrigation™ of crops in both soil and soilless media. Pure and highly soluble, Magnisal™ is safe for use with all types of irrigation equipment. It is compatible with all water-soluble fertilizers, except concentrated phosphate solutions.

Magnisal™, unlike magnesium sulfate, can be used with water of poor quality, hence recommended when the irrigtion water contains high levels of sulfates or salts. In most irrigation practices, magnesium concentration in the water should range between 20-60 ppm.

The following table shows stock-solution levels and injection ratios needed to obtain specified magnesium concentrations in the irrigation water.


 Mg concentration in the irrigation water 
 20 ppm40 ppm60 ppm80 ppm100 ppm 
Stock solutionInjection ratio 
25 kg / 1000 liter8.316.725.033.341.7Liter/m³
50 kg / 1000 liter4.28.412.516.821
50 Lbs / 200 gallon1. /gallon
100 Lbs / 200 gallon0.


When the injection ratio is preset, change the concentration of the stock solution to determine the concentration in the irrigation water (ppm Mg):


Target concentration20 ppm40 ppm60 ppm80 ppm
Injection ratiokg/lOz/galkg/lOz/galkg/lOz/galkg/lOz/gal


Note: data refer to magnesium (Mg) levels in the irrigation water, not to magnesium oxide (MgO).


Nutrigation™ of soil-grown crops

Determine Mg requirements according to soil and water analyses. If additional magnesium is required, apply 0.1-0.3 grams Magnisal™ per liter of irrigation water (1.3-4 Oz./100 gallon) per application.


Nutrigation™ in soilless media

For most crops, recommended magnesium concentration in the nutrient solution is 50-70 ppm MgO (30-40 ppm Mg). The magnesium level in the irrigation water should be taken into account. When the
Two-Tank method is employed, dissolve Magnisal™ in the tank that does not contain phosphorus (P).

The given recommendations should be regarded as a general guide only.

The exact fertilization program should be determined according to the specific crop needs, soil and water conditions, and the grower’s experience. For best results, follow the recommendation of a local crop consultant.


Magnisal™ for foliar applications

Foliar spray is an efficient tool to supplement and to enrich plant nutrition.
When absorption of nutrients from the soil is disturbed, foliar application of Magnisal™ provides the magnesium needed for normal development of crops.
When prompt correction of magnesium deficiency is required, foliar application is recommended, as uptake of magnesium by the leaves is very fast.


Preparation of tank-mix

Dissolve Magnisal™ in a small amount of water and add to the spray tank. When applying with cropprotecting agents, addition of wetting agent is not necessary. To ensure compatibility of tank-mix components, perform a small-scale test prior to actual application.


Foliar spray

To verify safety of suggested rates under local conditions and for specific varieties, it is recommended to spray on a few branches or plants. After 3-4 days check the tested plot for scorching symptoms.


CropWhen to applySpray concentration (%)Lbs. Magnisal™/ 100 gal water
Citrus1- 4 applications, when spring flush leaves are about 2/3 of final size and not yet hardened1-1.58-12
Deciduous fruit- trees3-4 applications at 14-day intervals, starting at bloom0.5-1.54-12
GrapesTo prevent “Dry Stalk”: 1-3 applications at 10-day intervals, starting after bunches have formed0.5-14-8
To prevent and cure chlorosis: 1-3 applications at 10-day intervals, starting after berry setting0.5-14-8
Mango1-2 applications when young leaves are about 2/3 of final size0.5-14-8
Olive• One week before anthesis
• Three weeks after bloom
Potato3 applications at 2, 3 & 4 weeks after emergence0.7-1.54-12
TomatoAt the beginning of fruiting0.5-1.54-12
CucumberAt the beginning of fruiting0.54
BarleyBeginning of shooting0.5-44-30
• Beginning of stem elongation
• Node formation
• Flag leaf sheet opening
• Anthesis complete


The given recommendations should be regarded as a general guide only.
The exact fertilization program should be determined according to the specific crop needs, soil and water conditions, and the grower’s experience. For best results, follow the recommendation of a local crop consultant.