First, the vegetable fertilizer four avoid l, avoid application of nitrate nitrogen. After the application of nitrate-nitrogen fertilizers in vegetables, the nitrate content in vegetables will increase exponentially. Nitrosalt-high vegetables are likely to cause human hemoglobin degeneration, making the brain, heart and other organs hypoxia, respiratory center paralysis. Nitrate is also reduced to nitrite in the human body. Nitrosamine is a very toxic carcinogen and may cause cancers in the digestive system, such as esophageal cancer and gastric cancer. Therefore, vegetables should avoid application of nitrate nitrogen fertilizer, should choose ammonium nitrogen fertilizer. 2. Avoid application of chlorine-containing fertilizers: Apply chlorine-containing fertilizers to the vegetable fields. After ammonium, potassium, and other nutrients are absorbed by the soil or absorbed by crops, chlorine ions remain in the soil. When the concentration reaches a certain amount, it will poison the crop roots. Reduce the starch and sugar content of vegetables, and even lead to plant death. Especially vegetables such as tomatoes and potatoes are most sensitive to chlorine. Do not apply it on production. 3, avoid application of fresh manure: Some farmers do not pay attention to fertilization health, fresh manure directly into the vegetable field, that the direct application of high fertilizer efficiency. In fact, this has created conditions for the spread of tsutsugamushi disease. The fresh human feces and urine without bulkiness and depletion contain roundworm eggs, which are very capable of living in the outside world and generally can survive for 3 to 6 months. When people consume vegetables contaminated by roundworms, they will become infected with roundworm disease, and then cause Ascaris asthma, aphid pneumonia, intestinal perforation, acute peritonitis and other diseases. In this regard, the vegetable field before the application of human excreta, through high temperature stuffy, fully cooked before they can be applied. 4, avoid drought and fertilization: vegetables are hi fertilizer crops, fertilizer when the soil is dry. Not only can the fertilizer effect not be fully exerted, but also the concentration of soil solution can suddenly increase, which can easily lead to burning of roots. therefore. To fertilize vegetables, it should be compatible with irrigation. At 10 cm from the root of the vegetables, fertilize and then water. two. Vegetable foliar dressing technology Foliage topdressing is a kind of fertilizing method for vegetable production, which is a quick economic effect, increasing yield, and improving quality. It can promote vigorous vegetable growth, prevent premature aging, and extend the supply period. l. Fertilizers suitable for foliar dressing: According to the different growth periods of different types of vegetables, select suitable fertilizers. Ape, melon, legume, and mushroom vegetables should be topdressed with phosphorus, potassium, zinc, molybdenum and other fertilizers during the seedling development period. Such as potassium dihydrogen phosphate, potassium sulfate, ammonium molybdate, chicken manure and rabbit feces fermentation filtrate, increasing production of hormones. Make the fruit bigger and improve its quality. Potatoes and vegetables should be sprayed with phosphorus and potassium-rich fertilizers such as superphosphate extract, grass ash extract, potassium dihydrogen phosphate and ammonium phosphate during the expansion period; Fertilizers with high nitrogen content, such as urea, ammonium nitrate, mature human and animal urine, etc., can also be applied as root trace elements. 2. Concentration and dosage of foliar dressing: Concentration should be light in the early period, should be concentrated in the middle and late. The amount of mu is less in the early period and more in the middle and later periods. Urea concentration 0.3% to 0.5%, 50 to 100 kg of mu, potassium nitrate, ammonium nitrate, ammonium sulfate, potassium sulfate 0.2% to 0.4%, 80-100 kg of mu; potassium dihydrogen phosphate 0.2% to 0.3% The amount of mu is 50 to 60 kilograms; the concentration of superphosphate leachate is 1% to 3%. The amount of mu is 50-100 kg; the concentration of boric acid is 0.03%-0.1%; the amount of mu is 50-80 kg; the amount of ash extracted from plants is 15 kg for plant ash and 10 kg for heated water. Soaking for 24 hours, adding 50 to 75 kg of water after filter residue. 3. Time and frequency of foliar spraying: It should be carried out on a sunny day without wind. It is best to have 3-4 days of fine weather after spraying. Spray fertilizer is best in the evening, and it is better to spray after the morning dew. After the first spray, spray once every 7-10 days, spray 3-4 times continuously. Spray fertilizer should be used now. Not long put. Third, the appropriate part of the foliar spray fertilizer focus on the upper leaves of vegetables, the absorption of nutrients on the back of the leaf is several times faster than the front to dozens of times, as far as possible to achieve positive and back spray.
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