In the process of planting green onions, in fact, it is best to avoid using chemical fertilizers as much as possible, especially urea, which belongs to chemical fertilizers and is a kind of strong chemical fertilizer. Once the proportion is improper and the concentration is too high, it is easy to burn the roots. If foliar fertilizer is sprayed, in hot weather, green onions planted in natural environment can be planted in spring, summer and autumn except in winter. Generally, planting in spring can be done after the soil is thawed; The planting in summer (because summer belongs to the dog days) is called fu cong, which shows that the amount of urea fertilizer applied is still strict. So for green onions, it is an important crop that my family must raise seedlings and transplant every year. This is just a few days ago.

The elongation of leaf sheath cells of pseudostems of Welsh onion requires a dark and humid environment, which is based on the input and accumulation of nutrients. Soil cultivation is an important measure to prevent lodging, soften leaf sheath, prolong the length of scallion and improve the yield and quality of scallion. The variety and quantity of fertilizers used in green onions have great influence on their growth, yield and quality. Among them, nitrogen is an important factor to determine the yield of Welsh onion, phosphorus affects the occurrence and growth of Welsh onion root system, and potassium mainly participates in photosynthesis and transportation of photosynthetic products.

All crops and vegetables are inseparable from nitrogen, phosphorus and potassium. But different plants have different requirements for various elements. The amount of nitrogen absorbed by Welsh onion is more than that of potassium, and the ratio of nitrogen to potassium is about1:0.9. When the onion stems are full, the absorption of potassium increases, and then shallow tillage and fine harrow can be used. 50kg compound fertilizer can be applied as base fertilizer per mu, and at the same time, 2.5kg furandan and 0.5kg carbendazim powder can be applied to kill underground pests and germs. Onion is topdressing in beginning of autumn, applying 3000-4000kg soil miscellaneous fertilizer or cake fertilizer 150-200kg, or urea 10-5 kg per mu.

Generally speaking, due to different varieties, it is necessary to adjust the amount and method of fertilization. Sufficient decomposed organic fertilizer should be applied in the planting ditch, but chicken manure should not be applied. And increase the application of phosphorus and potassium fertilizer, and generally apply 30OO-50OO kilograms of decomposed organic fertilizer per mu.