After the beginning of autumn, the temperature is significantly reduced, the air humidity is reduced, the temperature and humidity are suitable, and the growth period of the green onions is entered. Management should focus on “promoting roots, strengthening trees and softening soil†to create a suitable growth environment for the formation of scallions, thereby increasing the yield and quality of green onions. Specifically, we must grasp the following four points.
1. Scientific operation of fertilizer and water. After the beginning of autumn, the temperature gradually decreased, the root absorption function turned into a vigorous period, and entered the leafy stage, the demand for water and fertilizer increased significantly. During the period from Liqiu to Bailu, the principle of watering was “light pouring, early and late pouringâ€. Combined with watering and topdressing fertilizer, apply about 1,500 kg of decomposed farmyard manure per mu, 20-25 kg of superphosphate, and 10 kg of potassium sulfate to promote the rapid development of the leaves. After the white dew, the weather is cool, the temperature difference between day and night is increased, and the green onion enters the period of onion formation. It is also a key period for fertilizer and water management. Before the autumn equinox, the topdressing fertilizer should be based on quick-acting nitrogen fertilizer, and urea should be used. It is better to apply about 20 kg per mu. , add 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. 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 7-8 days before harvest to improve the storability of the green onion.
2. The soil is softened. "If you want to get green onions, you have to cultivate the green onions." Production practice has proved that the deeper the green onions, the longer the scallion. Soil cultivation is an important measure to soften the leaf sheath, prevent lodging, and improve the yield and quality of onion. From the beginning of autumn to the harvest before harvesting, it should be cultivated three times (Liqiu, Zhishu, Bailu). The thickness of each soil is cultivated to the top of the upper leaves. It is advisable not to bury the heart leaves so as not to affect the growth of green onions.
3. Prevention of pests and diseases. The control leaf miner can use 1500 times of 1.8% avermectin EC or 3500 times of 75% muscimol WP; spray 80% trichlorfon soluble powder 800 times in the early stage of spawning to larval hatching. Or 20% fenvalerate EC 2000-3000 times solution, or 2.5% deltamethrin EC 2000 times solution, spray once every 7-8 days, even spray 2-3 times. When black spot or purple spot disease occurs in the leaves of the onion, 50% carbendazim WP 500 times solution or 70% mancozeb WP 600 times solution can be used, and sprayed once every 7 to 10 days. , 2 to 3 times in a row.
4. Harvest at the right time. Nongyeyun "The cold dew does not receive onions, the longer the heart is, the more empty." Green onions should be harvested at the right time. In the central and southern regions of Hebei Province, harvesting is generally completed before the winter.
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