How to Prevent and Treat Nitrogen Disorders in Vegetables

I. Nitrogen disorders (1) Nitrogen deficiency symptoms: Nitrogen deficiency in vegetables generally indicates short plantlets, slow growth, chlorotic leaves and yellow leaves, sometimes the veins are purple, and the disease forms spread from the bottom up; severe nitrogen deficiency, showing whole plant yellowing The growth of young leaves ceased, axillary buds shrivelled, withered, and the delayed release of bulbous vegetables did not affect the appearance of fruit and vegetables. The nitrogen deficiency of vegetables caused a decline in product quality, dullness and freshness of the product, high crude fiber content, low moisture, and poor taste. (B) Excessive nitrogen conditions: Fruits and vegetables show increased foliage, long growth, less flowering, low fruit setting rate, abnormal fruit shape, bitter fruit, and poor quality; root vegetables are characterized by overgrown shoots, poorly developed underground, and even small roots. Empty. If the radish is excessive in the late stage of the radish, the leaves grow lushly, but the underground meat root often has a hollow phenomenon. Excessive nitrogen causes unbalanced nutrient in the plant and induces lack of elements such as potassium, calcium, and boron. Accumulation of ammonia in plants causes ammonia poisoning, which affects the yield and quality of vegetables, and also affects nutritional quality and sanitary quality. Accumulation of large amounts of nitrates endangers human health. . Second, nitrogen disorders disease control (a) lack of information 1. Cultivation of soil. Increase soil organic matter, increase organic fertilizer, such as manure, bar fertilizer, garbage fertilizer, etc., increase the nitrogen supply of the soil. 2. Apply topdressing nitrogen fertilizer several times. For sandy soil and long-growing vegetables, a small amount of nitrogen fertilizer was applied multiple times to make up for the shortage of nitrogen fertilizer. 3. Long-term focus on topdressing nitrogen fertilizer. For the bulbous period of the cabbage, during the fruit expansion period of fruit and vegetables, the nitrogen fertilizer is re-used for the fast and long term of leafy vegetables to make up for the shortage of nitrogen. (II) Prevention and control of excess nitrogen: To control the amount of nitrogen fertilizer, and pay attention to the application of nitrogen, phosphorus, and potassium fertilizers.

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