First of all, we must find out what symptoms of eggplant deficiency magnesium, the general characteristics are that the lower leaves are chlorotic and yellow, the veins remain green, and sometimes the leaves are accompanied by orange, purple and other motley. The difference from potassium deficiency is that magnesium deficiency chlorotic tends to yellowish whitening or whitening; the difference from physiological aging leaves is that the magnesium-deficient veins do not fade, the diseased leaves remain fresh for a long time, while the physiological senescent leaves are usually evenly yellowed, veins, The mesophyll is chlorotic at the same time, and it is mostly withered and lacks freshness. Since magnesium is required to form fruit, magnesium deficiency often occurs in the middle and late stages of growth, and several leaves appearing near the fruit first appear.
The prevention method is:
1. When planting eggplants in greenhouses, avoid the continuous cropping of vegetables such as cucumbers and tomatoes that require a large amount of magnesium.
2, timely irrigation, keep the soil moist, prevent soil salt concentration is too high, resulting in inhibition of magnesium absorption.
3. Apply magnesium sulfate and other magnesium fertilizers to about 10-20 kg per mu. For some acidic soils, it is best to use magnesium lime, which is about 50-100 kg per acre.
4. Spray with 1% to 2% magnesium sulfate solution, spray once every 5 to 7 days, and spray a total of 3 to 5 times.
The prevention method is:
1. When planting eggplants in greenhouses, avoid the continuous cropping of vegetables such as cucumbers and tomatoes that require a large amount of magnesium.
2, timely irrigation, keep the soil moist, prevent soil salt concentration is too high, resulting in inhibition of magnesium absorption.
3. Apply magnesium sulfate and other magnesium fertilizers to about 10-20 kg per mu. For some acidic soils, it is best to use magnesium lime, which is about 50-100 kg per acre.
4. Spray with 1% to 2% magnesium sulfate solution, spray once every 5 to 7 days, and spray a total of 3 to 5 times.
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