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Four types of crop damage and their preventive measures
Dehydration-type fertilizers are mainly caused by one-time application of too much chemical fertilizer, or insufficient soil moisture. After fertilization, the concentration of fertilizer solution in the soil is too large, causing the reverse osmosis of water in the crop cells and dehydration of the crop. The plants that are affected by the fertilizer show signs of wilting, which may appear to be frost-like or boiling water-like, and those that lightly affect the growth and development. In the worst cases, the whole plant will die. Prevention: Each dose should not be too large, when the drought can be taken with water flushing. Smoked-type fertilizers mainly use ammonia, ammonium bicarbonate, and Other fertilizers. These fertilizers are applied at high temperatures and are prone to produce large amounts of ammonia, causing damage to crops, lighter yellowing of the lower tip, and affecting growth and development. In severe cases, the whole plant will die of red and yellow. Prevention: This type of fertilizer should be avoided at high temperatures. When the seed fertilizer is used for fertilizer application, the dosage is too large, or the fertilizer is seeded with calcium superphosphate, ammonium bicarbonate, urea, lime nitrogen, etc., and seed burning often occurs, resulting in lack of seedlings. Prevention: Fertilizer dosage should not be too large, do not use superphosphate, ammonium bicarbonate, urea, lime nitrogen and other seed dressing. Toxic fertilizer Some chemical fertilizers, such as lime nitrogen, are applied to the soil and undergo a series of transformations to be absorbed by the plant. However, some toxic substances are poisoned in the conversion process, causing damage or death. Prevention: In the application of fertilizers, the application amount must be strictly controlled and the fertilizer should be used safely and rationally.