When fertilizing the plants grows faster, they should top-up a "foliar attacker" with 1500-2000 kg per hectare of farmyard manure and 20-25 kg of superphosphate. If the soil fertility is high and the base fertilizer is sufficient, the fertilizer can be postponed appropriately. Fertilizer can be changed to 750 kg human waste or 100 kg grass ash, 30 kg ammonium humic acid, 30 kg superphosphate, combined with deep fertilizer.锄 锄 进行 进行 进行 进行 进行 进行 进行 进行 进行 进行 进行 soil, then watering. After the White Dew Festival, it enters the period of vigorous growth of scallions, which is the key period for the formation of welsh onion production. It should be combined with watering to apply “strong manure†twice, each applying 15-20 kg of urea and 10-15 kg of potassium sulphate. Applying to the rows, watering after shallow cultivating, in order to speed up the absorption and utilization of fertilizer.
Watering at the end of summer and autumn, the field management center is to promote the root, watering should be carried out due to the weather, in addition to the long sunny and not rain, under normal circumstances should pay attention to control the water, rain after the flood control, to prevent rot, yellow leaves and dead seedlings . At the same time, strengthen the cultivator and promote root growth. Between the beginning of autumn and Bailu, the principle of light pouring, watering in the morning and evening should be mastered in irrigation. After the white dew, green onions enter the peak of growth, and irrigation should be based on the principles of pouring and re-watering. Pour water once every 4-6 days. After the frost falls, the temperature drops, the onion basically grows, the water requirement decreases, and the soil is kept moist. Stop watering 5-7 days before harvest to reduce the water content of light blue rice, in order to facilitate the harvest and extend the storage period.
Soil management combined with water and fertilizer management also requires scientific training. Soil cultivation is an important measure to soften leaf sheaths, prevent lodging, and increase light blue yield and quality. From the beginning of the autumn to the harvest, the soil is usually cultivated three times. The former two times combined with the cultivator, the ridge soil will be plunged into the onion ditch, and the ditch will be filled after the summer heat. The height of each cultivating earth of welsh onion should be determined according to the height of pseudostem growth. Each time 3-4 cm, the soil should be cultured to the leaf outlet of the uppermost leaf blade, and the heart leaf must not be buried to prevent the leaf rot.
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