Vegetable leaf fertilizer selection and use

The scientific and reasonable use of foliar fertilizer is very important for the growth of vegetables. According to different types of vegetables, the following describes the use of leaf fertilizer technology. Vegetable vegetables such as leafy vegetables require more water and fertilizer during the whole growth period, especially nitrogen-based fertilizers are more sensitive and urgent, such as nitrogen deficiency, the leaves are yellow-green, growth is slow, and yield is greatly reduced. Therefore, in addition to the application of base fertilizer, 1-2% urea (ammonium sulphate) solution should be sprayed at the seedling stage and the middle and later stages, once for 7 days to 10 days, and continuous spraying for 2 to 4 times can accelerate leaf pumping and rapid growth. , And can save costs and increase nitrogen fertilizer utilization, higher than the soil applied to 20% to 30%. If urea water is added, such as Green Fenway II (1000x-1500x), 802x (2000x-3000x), Yeebao (1000x), Huimanfengfei (500-1000x), and other foliar fertilizers, The yield increase effect is even more pronounced. The vegetables, such as melon vegetables, have relatively balanced requirements for nitrogen, phosphorus, potassium and trace elements (mainly boron, zinc and molybdenum). In the Deng seedling stage, nitrogen is required to be heavier than P and K. The three elements of the flowering period all require more, and potassium and phosphorus are required to be heavier than nitrogen during the seed stage. If the nitrogen deficiency in the flowering stage is insufficient, the premature aging and the fruit will be small; if the nitrogenous fertilizer is too much, it will be prolonged, falling off, and late ripening. Therefore, fertilization of fruits and vegetables should be more scientific. The seedling stage uses 1%-2% urea water and 3000-times 802 liquid spray to strengthen the roots and grow long leaves; flowering stage uses 1%-2% urea-water mixed 0.1-0.3 boric acid and 1000-fold plant power 2003 solution spray 2 - 3 times (interval 7 days or so) to increase the fruit setting rate and prevent "flower failure"; use 1% to 2% urea solution, or 0.2% to 0.3% potassium dihydrogen phosphate solution Spraying, once every 7 days to 10 days, spraying a total of two or three times, can fully supply the fertilizer needed for vegetable plants, and has a significant effect on reducing watering and fruit drop. Rhizomes such as these vegetables need more phosphorus than the world's fertilizers during their whole growth period, especially in the middle and late stages, they are more sensitive and have more quantities of potassium. If the potassium is insufficient, the organic nutrients produced by the leaves will be transported slowly and less to the rhizomes, leading to premature senescence and withering (or brown spot) disease in the leaves. Therefore, in addition to the application of a small amount of nitrogen fertilizer at the seedling stage, such vegetables should be given more potassium and phosphate in the middle and later stages. 1%~2% superphosphate soaking clear liquid and 1% chemical potassium fertilizer liquid can be used, once every 7 days, spraying 2~3 times. According to data, root vegetables spraying 1~2 times (20 grams to 15 kilograms of water) in the middle and late period can increase production by 15%~35%, and provide 7 days to 10 days in the morning, as well as drought resistance. , water, cold, stress and other effects.

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