In the production of shed vegetables, many farmers apply fertilizers frequently and excessively, which often causes soil compaction, rotten roots, decant roots, and plant wilting, which seriously affects farmers' economic benefits. For this reason, it is recommended that in the production of greenhouse vegetables, fertilization should be "four combinations". Combine top dressing and flushing fertilization. Choose high-quality fertilizers, mainly multiple compound fertilizers, and adopt a combination of topdressing and flushing. On the one hand, it solves the problem of fertilization for surface roots. On the other hand, topdressing can activate the soil layer, increase roots, and alleviate fertilizer efficiency. Combine organic and inorganic. Many farmers use chemical fertilizer as the main fertilizer, whether flushing or topdressing. Although some fertilized fertilizers contain humic acid, most of the inorganic fertilizers are nitrogen fertilizers such as ammonium nitrate and urea. They grow fast in the short term, with large leaves and long stems. From the surface, they grow well, but they lack long-term effects. Attention should be paid to the balance between vegetative growth and reproductive growth; some fertilization consists of cake fertilizer (hemp seed cake, cotton cake, bean cake), diammonium phosphate (or ammonium nitrate), and other fertilizers such as potassium chloride and potassium sulfate. It is not good because it takes a certain time for the cake fertilizer to ferment. Combine biological fertilizer and chemical fertilizer. Biological fertilizer contains more than ten kinds of beneficial bacteria, which has the effect of activating the soil and regulating nutrients. When combined with inorganic fertilizer (chemical fertilizer), it can relieve fertilizer damage, increase soil organic matter, and promote root development. Combination of big water and small water flushing. Many farmers use large water to carry fertilizer regardless of the seedling stage and fruiting stage, which makes the fertilizer and water too large, causing seedling disease, root rot and retting. Regardless of biological fertilizer, organic fertilizer, or chemical fertilizer, it is necessary to use fertilizer for seedlings and use a reasonable amount. "Small fertilizer and water nourish roots, medium fertilizer and water to protect seedlings, and big fat and water to nourish fruits" is this truth. It will be better if the soil is cultivated in time after fertilizer and water. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone Guofu Technology Group Co., Ltd , https://www.guofufarm.com