Identify and handle crop magnesium deficiencies
Interveinal yellowing suggests Mg deficiency
Magnesium roles in the plant
Magnesium is the heart of the chlorophyll molecule.
- It is essential for photosynthesis and formation of carbohydrates.
- Involved in enzymatic reactions and assists in generation of energy.
| Typical symptom: interveinal yellowing | ♦ Appears first on older leaves ♦ Proceeds to young leaves as deficiency gets worse |
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Magnesium deficiency: causes and correction
Nutritional balance:
♦ Calcium, potassium and ammoniacal nitrogen compete with magnesium on plant uptake.
♦ Avoid surplus application of K, Ca or NH4 that might result in magnesium deficiency.
♦ Keep nutritional balance according to the crop’s needs.
| Magnesium deficiency: causes and correction | |||
 | Are Mg levels in nutrient solution sufficient and suit the crop’s requirements at the growth stage? |  | Adjust Mg supply |
 | For most crops the pH of the root zone should be between 5.5 and 7.0 | | ♦ Adjust the pH of the nutritional solution to 5.5-6.5 by pH adding acid to the stock tank ♦ Applying of ammonium to lower pH should be done carefully, as it competes with the magnesium on root uptake |
 | Root zone temperature: below 15⁰C (59⁰F ) P uptake is impaired | | ♦ Consider heating of the root zone using heating pipes ♦ Heat the nutrient solution if practical |
 | Phosphorus form insoluble precipitates with magnesium, making it unavailable for plant uptake. | | Do not mix magnesium fertilizers in the same tank with P fertilizers. |
| Root zone temperature: below 15⁰C (59⁰F ) Mg uptake is impaired | | ♦ Consider heating of the root zone using heating pipes ♦ Heat the nutrient solution if practical |
 | | Foliar application of magnesium fertilizer is an effective way to provide Mg at stages of pick demand and to correct deficiencies. | |
Haifa’s Pioneering Magnesium fertilizers
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| Magnisal™ / Haifa MAG™ |
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Potato: macro nutrients - Mg (magnesium)
Apple: Macro nutrients - Mg (magnesium)
Avocado: Macro nutrients - Mg (magnesium)
Banana: Macro nutrients - Mg (magnesium)
Beans: Macro nutrients - Mg (magnesium)
Broccoli: Macro nutrients - Mg (magnesium)
Cabbage: Macro nutrients - Mg (magnesium)
Carrot: Macro nutrients - Mg (magnesium)
Celery: Macro nutrients - Mg (magnesium)
Citrus: Macro nutrients - Mg (magnesium)
Corn: Macro nutrients - Mg (magnesium)
Cucumber: Macro nutrients - Mg (magnesium)
Grapes-table: Macro nutrients - Mg (magnesium)
Lemon: Macro nutrients - Mg (magnesium)
Lettuce: Macro nutrients - Mg (magnesium)
Peas: Macro nutrients - Mg (magnesium)
Pepper: Macro nutrients - Mg (magnesium)
Rice: Macro nutrients - Mg (magnesium)
Tomato: Macro nutrients - Mg (magnesium)
Vine: Macro nutrients - Mg (magnesium)
Wheat: Macro nutrients - Mg (magnesium)
Magnesium deficiency symptoms in Raspberries