Excessive use of nitrogen fertilizers often produces fertilizer damage. The reasons are:
(1) Gas poisoning mainly refers to ammonia poisoning. Not only ammonia poisoning is easy to occur when ammonium bicarbonate is applied, but also ammonia poisoning may occur when urea is applied. When the concentration of ammonia in the air reaches 5 mg/kg, it will cause damage to the leaves; when the concentration reaches 40 mg/kg, ammonia will make the mesophyll tissue necrotic, chlorophyll disintegrates, and brown spots or lumps appear between veins.
(2) Concentration damage When an excessive application of nitrogen fertilizer, it is very easy to cause the soil solution concentration is too high, the penetration resistance increases, resulting in crop root water absorption difficulties, or even cell "dehydration" phenomenon, at the beginning of the leaf bristles, and then leaves yellow withered, The masses call it "burning seedlings."
The method to prevent the damage is:
1 Control the amount of nitrogen fertilizer, should be divided application.
2 Increase organic fertilizers to increase soil fertility and increase soil buffering.
3 Do not splash on the leaves during fertilization, especially when there is dew, and do not spray it to avoid burns.
(1) Gas poisoning mainly refers to ammonia poisoning. Not only ammonia poisoning is easy to occur when ammonium bicarbonate is applied, but also ammonia poisoning may occur when urea is applied. When the concentration of ammonia in the air reaches 5 mg/kg, it will cause damage to the leaves; when the concentration reaches 40 mg/kg, ammonia will make the mesophyll tissue necrotic, chlorophyll disintegrates, and brown spots or lumps appear between veins.
(2) Concentration damage When an excessive application of nitrogen fertilizer, it is very easy to cause the soil solution concentration is too high, the penetration resistance increases, resulting in crop root water absorption difficulties, or even cell "dehydration" phenomenon, at the beginning of the leaf bristles, and then leaves yellow withered, The masses call it "burning seedlings."
The method to prevent the damage is:
1 Control the amount of nitrogen fertilizer, should be divided application.
2 Increase organic fertilizers to increase soil fertility and increase soil buffering.
3 Do not splash on the leaves during fertilization, especially when there is dew, and do not spray it to avoid burns.
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