One is not to use large amounts of nitrogen fertilizers. The fertilization of watermelon is the most concerned with the combination of nitrogen, phosphorus and potassium. If a single application of large amounts of nitrogen fertilizer, the plants are extremely prolonged, which is not conducive to flowering melon and fruit development. According to the research, watermelon is mainly absorbed by nitrogen before sitting on melon, and the absorption of potassium is increased dramatically after sitting on melon; the requirement of nitrogen and potassium is basically the same in the hair removal stage of melon, and the absorption reaches a peak during the expansion stage. Absorption is significantly reduced at the mature stage, and the absorption of phosphorus is relatively increased. The ratio of nitrogen, phosphorus and potassium, the seedling period should be 3.8:1:2.8, the extension period is 3.6:1:1.7, and the melon growth period is 3.5:1:4.6. The second is not to use chlorine-containing fertilizers. Watermelon is a chlorine-tolerant crop, and the application of chlorine-containing fertilizers (such as ammonium chloride, potassium chloride, etc.) will affect the accumulation of sugar and make the melon taste lighter. Excessive application of human excreta, easily lead to plant leggy, so that sitting melon is difficult, melon skin thick and taste sour. The third is not to fertilize the topsoil. Pay attention to the deep application of watermelon dressing, timely cover after application, especially nitrogen fertilizer. If formulated, nitrogen is easily volatilized to produce ammonia, which damages the leaves and also reduces the effectiveness of the fertilizer. Rainy weather has high air humidity and high soil moisture. Fertilizer is not only easy to lose fertilizer, but also can cause watermelons to grow. Fourth, do not fertilize too close to the root. The fertilization site of watermelon is generally required to be about 10 centimeters from the main root, and it is easy to burn roots when it is too close, which affects the growth of plants. When the weather is dry and the soil water content is low, the application of chemical fertilizers will allow the cytoplasmic solution of the root cells to infiltrate, resulting in physiological water shortage and dead plants. Hot-dip galvanization is a form of galvanization. It is the process of coating iron and steel with zinc, which alloys with the surface of the base metal when immersing the metal in a bath of molten zinc at a temperature of around 840 °F (449 °C). When exposed to the atmosphere, the pure zinc (Zn) reacts with oxygen (O2) to form zinc oxide (ZnO), which further reacts with carbon dioxide (CO2) to form zinc carbonate (ZnCO3), a usually dull grey, fairly strong material that protects the steel underneath from further corrosion in many circumstances. Galvanized steel is widely used in applications where corrosion resistance is needed without the cost of stainless steel, and is considered superior in terms of cost and life-cycle. Galvanized Steel Pipes,Galvanised Pipe,Galvanised Steel Pipe JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.skyplantgreenhouse.com