When cultivating asparagus, use more organic fertilizers to make the soil loose and fertile, which is conducive to the development of underground stems and root systems. The amount of fertilizer should be considered based on factors such as plant growth, soil fertility and utilization rate.

The growth of the plant includes the yield of tender stems, the weight of above-ground stems, and the growth of underground stems and fleshy roots. Based on the annual yield of 400 kilograms of tender stems per mu, the absorption of three elements by asparagus is: 6.96 kilograms of nitrogen, 1.8 kilograms of phosphorus, and 6.2 kilograms of potassium. When fertilizing, the utilization rate of nitrogen and potassium is about 50%, and the utilization rate of phosphorus is 20%. In addition, 20% of the nutrients required by the plant are already present in the soil, so the actual fertilizer amount should be 11.1 kg of nitrogen, 7.2 kg of phosphorus, and 9.9 kg of potassium. When harvesting white asparagus, combine cultivating and loosening the soil between May and August of the first year after the seedlings are planted, and apply thin human excrement 3 to 4 times around the plants to promote vigorous growth of the plants. In the spring of the following year, dig ditches on both sides of the plant 30-40 cm away from the plant. Apply 1,500-2,000 kg of compost, 25 kg of superphosphate, 1,200 kg of human feces or 12 kg of urea per acre. Mix it with the soil and then cover it with soil. without. Harvest the young stems starting in the third year after planting. After harvesting the young stems, apply 2,000-2,500 kilograms of compost per mu, 1,200 kilograms of human excrement, 35 kilograms of superphosphate, and 15 kilograms of potassium chloride in the center of the furrow. In summer and autumn, apply dilute human feces and potassium chloride 2-3 times near the plants after cultivating and loosening the soil. The focus of top dressing should be arranged in autumn when the plants are growing vigorously.

For green asparagus, the fertilization method in the first year after planting is the same as for white asparagus. From the second year onwards, the focus of fertilization is in spring, followed by autumn. In the spring of the second year, before extracting the young stems, dig a deep trench in the center of the furrow and apply compost, human excrement, superphosphate, potassium chloride, etc. The amount of various fertilizers used is about 70% of the amount of fertilizer applied after the white asparagus is harvested in the third year. Apply dilute human feces and potassium chloride 2-3 times near the plants in summer and autumn. The amount of fertilizer applied in the spring of the third year increased by 30% compared with the second year. The amount of fertilizer should be increased appropriately after the fourth year.

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