Oversupply of nitrogen often makes crops less mature. In some areas where the frost-free period is short, crops often suffer from serious damage from early frost due to excessive nitrogen growth resulting in prolonged growth. Excessive nitrogen often causes the cells to be large, the cell wall is thin, the cells are juicy, the plants are soft, and they are vulnerable to mechanical damage and bacterial invasion, such as rice brown spot, wheat scab, and corn leaf blight. Too much nitrogen also consumes a lot of carbohydrates, affecting the product quality of the crop.
For Chinese cabbage and some fruits, excessive nitrogen application will reduce the quality of storage and transportation. Excessive supply of nitrogen will also make the cereal crops hypertrophy, mutual shade, excessive consumption of carbohydrates, stalks are weak, easy lodging and lead to reduced production. Cotton often grows abnormally due to excessive nitrogen, manifesting itself as a tall plant, with long legs, sparsely populated bells, and easy to fall off, and the proportion of flowers after frost increases. The sugar yield of sugar beet roots declines due to the high nitrogen content. Plants with high nitrogen content have cell juicy characteristics, which is unfavorable for fiber crops. For example, if nitrogen is supplied to hemp, the biomass is increased, but the fiber yield is reduced and the fiber tension is reduced. Applying large amounts of nitrogen fertilizer will also increase the nitrate content in the crop and threaten human health.
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