After the autumn festival, the temperature is significantly reduced, the air humidity is reduced, and the suitable temperature and humidity make the green onion enter a period of rapid growth. During this period, it is necessary to scientifically formulate fertilizer water to create a suitable growth environment for the formation of green onion, thereby increasing the yield of green onions and Quality, in production, we must grasp the following points:
1. After the beginning of autumn, the temperature gradually decreased, the root absorption function turned into a vigorous period, and entered the leafy stage, the need for water and fertilizer increased. During the period from Liqiu to Bailu, the principle of watering was “light pouring, early and late pouringâ€, combined Watering and topdressing “grazing leaf fertilizerâ€, apply 1,500 kg of decomposed farmyard manure, 20~25 kg of superphosphate, and 10 kg of potassium sulfate per mu to promote the rapid development of the leaves.
2. After the white dew, the weather is cool, the temperature difference between day and night is increased, the green onion enters the period of onion formation, and it is also the key period of fertilizer and water management. In the white dew to the autumn, the topdressing is mainly based on quick-acting nitrogen fertilizer, and urea is good, 20 kg per acre. It is advisable to add about 15 kg of potassium sulfate. The principle of watering is “deep pouring, re-castingâ€, and the soil is often kept moist to meet the growth requirements of scallion.
3. After the frost, the weather is getting colder, the leaf body grows more slowly, the leaf water transpiration is reduced, and the watering should be gradually reduced. The watering should be stopped 7 to 8 days before harvest to improve the storability of the green onion. (Dan Lan)
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