Scientific use of foliar fertilizer to increase vegetable yield

The scientific selection of foliar fertilizer is more important for vegetable production. Because vegetables are topdressed at the seedling stage and in the middle and late stages after transplanting, they can promote growth and restore vitality, increase yield and improve quality. In the prevention and control of pests and diseases, if the foliar fertilizer can be mixed and sprayed, a double effect can be obtained. According to different types of vegetables, the following techniques for selecting and using foliar fertilizers are reviewed for reference by farmers.
First, leafy vegetables: refers to the leaves of vegetables that are mainly eaten all year round, such as Chinese cabbage, Chinese cabbage, broccoli, cauliflower, Shanghai green, spinach, leeks and so on. This type of vegetable requires more water and fertilizer during the whole growth period and is more sensitive to available nitrogen fertilizer. If the nitrogen fertilizer is insufficient, the leaves are yellow-green, the growth is slow, and the yield is greatly reduced. Therefore, in addition to the application of the base fertilizer, spraying 0.5~1% ammonium urea sulfate solution in the seedling stage, middle and late stage for 7-10 days, continuous spraying 2~4 times, can accelerate the growth of the leaves and increase the nitrogen utilization rate. 20~30%, if the Fenwei 2 (1000 times) or Foliar (1000 times) foliar fertilizers are added together in the urea water, the yield increase effect and economic benefits are greater.
Second, melons and fruits: vegetables mainly based on edible fruits, such as solanaceous fruits, beans, various melons and so on. The need for such vegetables for nitrogen, phosphorus, potassium and trace elements (boron, zinc, molybdenum, uranium, copper) is relatively balanced. That is, the nitrogen requirement in the seedling stage is heavier than that of phosphorus and potassium. The three elements in the flowering stage are needed, and the potassium and phosphorus are heavier than the nitrogen in the fruiting stage. If the nitrogen fertilizer is insufficient at the seedling stage and flowering stage, it is easy to prematurely decay and the fruit is small; if the nitrogen fertilizer is too much, it is easy to grow wild, fruit drop and late maturity, so fertilization is more scientific. That is to say, 0.5~1% urea water is added in the seedling stage to add 2000~3000 times of "802" or plant power 2003 solution spray, which is beneficial to strong roots and long leaves to set up high yield frame; flowering period is 1~2% urea water mixed 0.1 ~0.3% boric Acid solution or green Fenway 1 1000 times mixture, interval 5~7 days, spraying once or twice, is conducive to increase the fruit setting rate; the flowering period is 1~2% urea water mixed with 0.1% flower buds And the "three-in-liquid" solution such as 0.1~0.3% potassium dihydrogen phosphate, sprayed once every 7~10 days, sprayed two or three times, can significantly reduce the falling and falling fruit, and can effectively reduce the leaf surface temperature and increase the ground moisture. It creates an excellent environment in which water, fertilizer, gas, heat and light are coordinated with each other to create a foundation for high yield.
Third, rhizome: refers to tubers, roots and other vegetables, such as potatoes, sweet potatoes, garlic, onions, white radish, green onions, taro, yam, lotus root and so on. This type of vegetables requires more phosphorus and potassium fertilizer than nitrogen fertilizer during the whole growth period, especially in the middle and late stages. In addition to applying a small amount of nitrogen fertilizer in the seedling stage, such vegetables should be applied with potassium and phosphate fertilizers in the middle and late stages to meet the needs of root and stem hypertrophy. Optional 1-2% molybdenum perphosphate molybdenum immersion liquid 0.1~0.3% dihydrogen phosphate Potassium solution, 5~10% ash ash filtrate, 1~2% potassium chloride (potassium sulphate) solution, spray once every 7~10 days, a total of two or three times, the yield increase effect is obvious. According to the data, the root-stem vegetables are sprayed once in the middle and late 10 days, and the compound can be increased by 15~35%, and the morning market is 7~10 days. It also has the functions of drought resistance, water saving, cold resistance and stress resistance. Its concentration is 20g of eucalin and 15kg of water. It can also be mixed with acidic pesticides and sprayed according to their respective concentrations. It can also prevent the spread of pests and roots and rhizome.
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