Nitrogen disorders caused by vegetable diseases and control measures
Sardine Canned In Tomato Sauce Zhoushan City Shuangying Aquatic Products Co., Ltd.  , https://www.shuangying-aquatic.com
October 06 04:00:56, 2024
First, the condition: 1, nitrogen deficiency symptoms: refers to the lack of nitrogen fertilizer plants nitrogen deficiency plants. The general nitrogen-deficient vegetables show dwarf plantlets, slow growth, chlorotic leaves, yellowish leaves, sometimes purple veins, and disease progression from the bottom up; severe nitrogen deficiency, yellowing of the entire plant, young leaf growth, axillary bud atrophy, withered The delay of the ball type dishes is not included, and the fruit and vegetables are getting deformed. After nitrogen deficiency, vegetables caused a decline in product quality, dull and fresh products, high crude fiber content, low water content, poor taste, and low nutrient content. 2, excessive nitrogen sickness: refers to excessive nitrogen fertilizer, causing abnormal growth and development of vegetables. Its appearance, especially if the vegetables for the increase of foliage, lengthy, less flowering, fruit set, fruit deformity, bitter fruit, poor quality; root vegetables manifested as overgrown shoots, underground growth, small roots even 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, induces lack of elements such as potassium, calcium, and boron; ammonia accumulates in the plant and causes ammonia poisoning; affects the yield and quality of vegetables, and also affects nutritional quality and sanitary quality. Accumulation of large amounts of nitrates may endanger human health . Due to the high nitrate content of the vegetables, nitrites are produced by the action of the stomach and nitrites are converted to methylamine, which is a strong carcinogen and severely affects human health. Second, the reasons: 1, the lack of prime-like: A poor soil fertility, organic matter less, low nitrogen supply capacity. B. Vegetable crops require large amount of nitrogen fertilizer, long growing season or fast-growing vegetables require large amounts of nitrogen, vegetables show nitrogen deficiency. 2, excessive shape: A before the nitrogen residue is high. B Protected cultivation, such as plastic greenhouses, vegetables are prone to nitrogen formation. Third, the prevention and treatment of nitrogen disorders: 1, lack of raw materials: A cultivate soil. Increase soil organic matter, increase organic fertilizer, such as manure, bar fertilizer, garbage fertilizer, etc., increase the nitrogen supply of the soil. B and quantity 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. C Wang 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. 2, nitrogen excess control: to do to control the amount of nitrogen fertilizer, and pay attention to nitrogen, phosphorus, potash fertilizer application.