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 chasing "leaf-leaf fertilizer", and vegetables and strong stems to promote the rapid development of the leaves.
2. After the white dew, the weather is cool, the temperature difference between day and night increases, and the green onion enters the period of onion formation, which 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 better, combined with the new high spraying. Lipid film improves fertilizer efficiency. 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.
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