Foliar spray fertilizer is an effective fertilization method for vegetable production, which is economical, quick-impact, and improves yield and quality. It not only promotes vigorous vegetable growth, robustness, prevents premature aging, but also prolongs the supply period. Especially for the gradual aging of the root system, the absorptive function has been declining. In the middle and late stages of vegetable growth, the extra-root fertilizer application has been more effective.
First, select the appropriate fertilizer melons, mushrooms, legumes vegetables should be sprayed in the seedling stage of phosphorus, potassium, zinc, copper fertilizer, such as potassium dihydrogen phosphate, potassium sulfate, chicken manure and rabbit feces and other fermentation filtrate, increase production It promotes fruit enlargement and improves quality. Potatoes and vegetables should be sprayed with P and K rich fertilizers such as superphosphate leachate, grass ash leachate, potassium dihydrogen phosphate and ammonium phosphate during the expansion period. The leafy vegetables should be sprayed with fertilizers with high nitrogen content, such as urea, ammonium nitrate, decomposed human and animal urine, etc., at the right amount of time, and the corresponding trace elements can also be sprayed. In addition, in the early winter and early spring of the leek grown in a plastic greenhouse, the yield increase was particularly significant in the ninety-second and ninety-fifth days after each harvest.
Second, the concentration and amount of foliar spray fertilizer should be appropriate to the early growth of vegetable spray concentration should be light, the amount should be less. In the middle and late stages, the roots of vegetables are gradually senescent and their absorptive function is reduced. To ensure the growth and development of the above-ground parts for nutrient requirements, the spraying concentration should be strong and the amount should be more. The amount of mu is less in the early period and more in the middle and later periods. The concentration of urea is generally 0.5%, 1 kg per mu, and 60-100 kg of water is sprayed; the concentration of potassium dihydrogen phosphate is 0.2%, 100 g per mu, and 50 kg of water is sprayed; the leaching solution of grass ash is 15 kg of ash per acre. Heat 10 kg of water and soak for 24 hours. 50 kg of water was sprayed after removing impurities.
Third, to grasp the time and frequency of foliar spraying, and the spraying of key foliar spray should be carried out on a sunny day without wind. It is best to have 3-4 days of fine weather after spraying. However, it is generally best to spray in the evening, and it is also appropriate to spray after drying in the morning. One is to prevent the evaporation of liquid fertilizer under strong light before and after noon, and the other is that the pores of vegetable leaves in the morning and afternoon are in the open stage, and the liquid fertilizer is easily absorbed and utilized by the leaves after spraying. Spraying times, due to strong growth potential in the early stage of vegetable growth, can be sprayed once every 7-10 days, even spraying 3-4 times, in the middle and late due to weak root absorption, can be sprayed 3-5 times. Foliar spray fertilizer should pay attention to the current use, can not be put for a long time. It is necessary to spray the front and back of the blade as evenly as possible to obtain a better yield increase. However, it must be noted that the root-spraying fertilizer is an auxiliary measure after all, and the top-dressing can not be ignored. Fourth, grasp the key parts of spray fertilizer Different mineral elements in the plant body movement ability is different, spray poor mobility of minerals, should pay attention to spray on the fertilizer requirements, and increase the number of spray. For example, iron should be sprayed on young leaves in order to obtain good results, as well as calcium, zinc, and boron fertilizers. Nitrogen, phosphorus, potassium, magnesium, and zinc fertilizers can be sprayed to increase the absorption area.
First, select the appropriate fertilizer melons, mushrooms, legumes vegetables should be sprayed in the seedling stage of phosphorus, potassium, zinc, copper fertilizer, such as potassium dihydrogen phosphate, potassium sulfate, chicken manure and rabbit feces and other fermentation filtrate, increase production It promotes fruit enlargement and improves quality. Potatoes and vegetables should be sprayed with P and K rich fertilizers such as superphosphate leachate, grass ash leachate, potassium dihydrogen phosphate and ammonium phosphate during the expansion period. The leafy vegetables should be sprayed with fertilizers with high nitrogen content, such as urea, ammonium nitrate, decomposed human and animal urine, etc., at the right amount of time, and the corresponding trace elements can also be sprayed. In addition, in the early winter and early spring of the leek grown in a plastic greenhouse, the yield increase was particularly significant in the ninety-second and ninety-fifth days after each harvest.
Second, the concentration and amount of foliar spray fertilizer should be appropriate to the early growth of vegetable spray concentration should be light, the amount should be less. In the middle and late stages, the roots of vegetables are gradually senescent and their absorptive function is reduced. To ensure the growth and development of the above-ground parts for nutrient requirements, the spraying concentration should be strong and the amount should be more. The amount of mu is less in the early period and more in the middle and later periods. The concentration of urea is generally 0.5%, 1 kg per mu, and 60-100 kg of water is sprayed; the concentration of potassium dihydrogen phosphate is 0.2%, 100 g per mu, and 50 kg of water is sprayed; the leaching solution of grass ash is 15 kg of ash per acre. Heat 10 kg of water and soak for 24 hours. 50 kg of water was sprayed after removing impurities.
Third, to grasp the time and frequency of foliar spraying, and the spraying of key foliar spray should be carried out on a sunny day without wind. It is best to have 3-4 days of fine weather after spraying. However, it is generally best to spray in the evening, and it is also appropriate to spray after drying in the morning. One is to prevent the evaporation of liquid fertilizer under strong light before and after noon, and the other is that the pores of vegetable leaves in the morning and afternoon are in the open stage, and the liquid fertilizer is easily absorbed and utilized by the leaves after spraying. Spraying times, due to strong growth potential in the early stage of vegetable growth, can be sprayed once every 7-10 days, even spraying 3-4 times, in the middle and late due to weak root absorption, can be sprayed 3-5 times. Foliar spray fertilizer should pay attention to the current use, can not be put for a long time. It is necessary to spray the front and back of the blade as evenly as possible to obtain a better yield increase. However, it must be noted that the root-spraying fertilizer is an auxiliary measure after all, and the top-dressing can not be ignored. Fourth, grasp the key parts of spray fertilizer Different mineral elements in the plant body movement ability is different, spray poor mobility of minerals, should pay attention to spray on the fertilizer requirements, and increase the number of spray. For example, iron should be sprayed on young leaves in order to obtain good results, as well as calcium, zinc, and boron fertilizers. Nitrogen, phosphorus, potassium, magnesium, and zinc fertilizers can be sprayed to increase the absorption area.
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