One must determine the proportion of fertilizer. The ratio of pure nitrogen, pure phosphorus and pure potassium required for each 1000 kilograms of potato tubers was 5:2:11, and the amount of fertilizer was determined according to soil nutrients. Second, increase organic fertilizer. Organic manure is a complete fertilizer containing a large number of trace elements necessary for the growth of potatoes. Third, we must use basal fertilizers correctly. Basal fertilizers are mostly organic or organic and inorganic fertilizers. In the case of adequate fertilizer can be fully applied to improve the soil fertility; if the fertilizer is limited, it is more reasonable to concentrate on seed fertilizer use. The amount of basal fertilizer generally accounts for more than two-thirds of the total amount of fertilization, and the basal fertilization is based on decomposed farmyard manure, and a certain amount of quantitative fertilizer is added. The specific fertilization amount is: a plot of land of about 1,500 kg in 667 square meters, 1500-2500 kg of organic fertilizer, 20 kg of Urea, 20-30 kg of Calcium, 10-12 kg of potash, and will be applied to calcium, magnesium and sulfur. The requirements for medium and trace elements are relatively large. In order to improve the quality, extra-root fertilizers can be combined with pest control. 667 square meters is sprayed with 200 grams of Gaole foliar fertilizer and 400 times of liquid is sprayed. The amount of boron fertilizer to be applied is 0.5-1 kg per 667 m2. It is better to use basal fertilizer as the base fertilizer, and it can also be used as a root spray. The 0.2% spray concentration is appropriate. Trisodium Citrate,Sodium Citrate,Food Additives,Magnesium Citrate Wuxi Yangshan Biochemical Co.,Ltd. , https://www.yangshanchem.com