First, we must apply enough base fertilizer. The base fertilizer can supply the nutrients needed for the whole growth period of the lotus root, and has the functions of improving the soil and fertilizing the soil. The amount of base fertilizer in Putian should be determined according to the soil fatness and thinness. Most of the planted lotus roots are selected from fertile soil, rich in organic matter, and convenient for irrigation and drainage. In combination with the whole land, 2500-3000 kg of fertile farmyard manure and 60-80 of general-purpose compound fertilizer are applied per mu. Kg, and apply calcium, boron, zinc and other fertilizers, and then plow 20 to 30 cm deep, cultivate fine and flat, put 3 to 5 cm shallow water for use.
Second, we must rationally topdress. Lotus root needs to be topdressed 2 to 3 times throughout the growing season. The first time when the plant has 1 or 2 leaves (25 to 30 days after planting), 15 kg of urea per mu or 1500-2000 kg of decomposed farmyard manure, Potassium sulphate 7.5 ~ 10 kg; the second time in 5 ~ 6 pieces of leaves (40 ~ 50 days after planting), apply high nitrogen and potassium compound fertilizer per acre 20 ~ 25 kg; the third time in the emergence of the terminal leaves At the time of this application, the crusting begins, and 15 to 20 kg of high-potassium compound fertilizer is applied per mu, or about 2000 kg of manure and manure is applied. When applying fertilizer, choose sunny and windless weather. In the morning or evening, put shallow water before each fertilization, let the fertilizer dissolve into the water, fertilize it for 2 days, then pour it to the original depth. After topdressing, pour water to rinse the lotus leaf. For deep-water polders, it is best to apply the fertilizer to the fat mud group to prevent the fertilizer from floating. When fertilizing, be careful not to step on the lotus whip, so as not to affect the scarring.
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