First, the seedlings must be transplanted with fertilizer. When growing seedlings, we must use a sandy soil with deep, sterile sandy soil as the seedbed, and do not use old seedling beds of previous years. Second, we must use adequately composted compost and silt and other organic fertilizers as basal fertilizers, and the dosage should account for 50% of the total fertilizer applied to the seedbeds. The third is to apply a certain amount of compound fertilizer or phosphorus and potassium fertilizer. Fourth, we must make early use of adequately decomposed human excreta to fully mix it with bed soil. At the same time, 15 days before making nutrients (blocks), 200-300 ml of formalin and 25-30 kg of water were sprayed for every 100 kg of nutrient soil, mixed with spraying and then covered with a film to kill germs. Generally every cubic meter of nutrient soil can do nutrients (blocks) 2000 or so, to do é’µ (block), side sowing, side cover soil, side coating.
Second, high-quality basal fertilizer should be applied in divided portions. Basal fertilizer is dominated by organic fertilizers, supplemented by chemical fertilizers. In the structure of fertilizer, mainly nitrogen and potassium fertilizers, followed by phosphorus fertilizer, and appropriate amount of micro-fertilizer. Organic fertilizer is mainly composed of various types of high-energy bio-organic fertilizers such as various types of cake fertilizers, composts, manures, and bio-organic compound fertilizers. Basal fertilizer per acre 100 kg cake or fully cooked compost 4000 ~ 5000 kg, 75 ~ 100 kg of plant ash or bio-organic compound fertilizer 75 ~ 100 kg, and with a high content of compound fertilizer 50 kg. Of course, when determining the amount of fertilizer, it is also necessary to increase or decrease according to the local soil quality and fertility. The first application of basal fertilizer should be 20 days before the watermelon sowing or seedling transplanting, the amount of fertilizer should account for about 70% of the total amount of basal fertilizer. The second application of basal fertilizer was separated from the first by about 10 days, and the application amount was about 30% of the total amount of basal fertilizer.
Third, we must optimize fertilization techniques. The first is to change the application of basal fertilization for the purpose of applying or acupuncture, and the application of a large number of points is not as good as applying a point and a line. The second is to change the primary application of basal fertilizer for secondary application and stratified application. The first application of basal fertilizer is to be applied in a depth of about 25 cm. The second application of basal fertilizer should be applied at a depth of about 10 cm. The thickness of cover soil is not. Below 3 cm, and make good marks for fertilization. Third, the ratio of basal fertilizer and topdressing fertilizer should be 7:3 or 6:4. Top dressing is generally divided into drawing seedling fertilizer, cranberry manure, and swelled manure fertilizer, combined with pest control to conduct extra-root fertilizer application. The fourth is to look at the land to adapt to fertilization, water shortages after land fertilization should be watered; groundwater level of land is too high, to do deep trench lift field. In short, we must use water to make use of water to activate fertilizers and improve the efficiency of fertilizer application.
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