How to fertilize asparagus seedlings?

How to fertilize asparagus seedlings? Please introduce the method that asparagus seeds must be affected by various diseases and insect pests in the process of development. Now I will teach you the fertilization technology of asparagus. I hope it will be useful to the bamboo shoot farmers! The cultivation of asparagus should use more organic fertilizer to make the soil loose and fertile, which is beneficial to the development of underground stem and root system. The amount of fertilizer was comprehensively considered according to the plant growth, soil fertility and utilization rate. The plant growth includes the yield of tender stem, the weight of aboveground stem and the growth of underground stem and fleshy root. According to the annual yield of 400 kg per mu of tender stem, the absorption of asparagus to the three elements is 6.96 kg of nitrogen, 1.8 kg of phosphorus and 6.2 kg of potassium. When fertilizing, the utilization rate of nitrogen and potassium is about 50%, and that of phosphorus is 20%. In addition, 20% of the nutrients needed by the plant already exist in the soil, so the actual amount of fertilizer should be 11.1 kg of nitrogen, 7.2 kg of phosphorus and 9.9 kg of potassium. White asparagus harvested from May to August in the first year after seedling planting combined with ploughing and loosening soil, thin human feces and urine were applied around the plant for 4 times to promote the growth of the plant cluster. In the spring of the following year, ditches were opened on both sides of the plant at a distance of 30km / mu from the plant. 1500Mu / mu was applied with 1500Mu of compost, 25kg of calcium superphosphate, 1200 kg of human feces and urine or 12kg of urea. Mix well with the soil and then cover it with soil. The tender stems were harvested in the third year after planting. After the tender stems were harvested, compost was applied in the middle of the furrow at 2000Mu, 1200 kg of human feces and urine, 35 kg of calcium superphosphate and 15 kg of potassium chloride. After ploughing and loosening the soil in summer and autumn, 2 Mel was applied near the plant for three times with thin human feces and urine and potassium chloride. The key point of topdressing should be arranged when the plant is growing vigorously in autumn. If green asparagus is harvested, the fertilization method in the first year after planting is the same as that of white asparagus. From the second year, the focus of fertilization is in spring, followed by autumn. The following spring, before smoking young stems, dig deep ditches in the middle of the furrow and apply compost, human feces and urine, calcium superphosphate and potassium chloride, etc. The amount of various fertilizers is about 70% of that of white asparagus after harvest in the third year. Dilute human feces and urine and potassium chloride were applied 3 times near the plant in summer and autumn. The amount of fertilizer applied in the spring of the third year was 30% higher than that of the second year. The amount of fertilizer will be increased appropriately after the fourth year. Click to get more asparagus planting techniques click to get more vegetable planting techniques