Symptoms
Symptoms of magnesium deficiency start on older leaves. Chlorosis between the veins progresses from the margins to the middle of the leaflets. The veins remain green and white respectively.
Severe deficiency leads to necrotic spots between the veins.
Old leaves are stiff and prematurely fall down.
Reasons
Magnesium deficiency
Magnesium deficiency made worse by
Sandy soils
Acidic soils
Potassium rich soils
Soils receiving high potash applications
Cold wet periods
Magnesium is important for
Increases photosynthetic activity maintaining good growth for high yields