Hebei Province is an important green onion cultivation base in northern China. Its area and production occupy an important position. In addition to satisfying local consumer demand, it is also exported to many provinces and cities such as Beijing, Tianjin, Northeast China, Inner Mongolia, and Shanxi. Households also benefited from it. After entering the autumn festival, the temperature is significantly reduced and the air humidity is reduced. The appropriate temperature and humidity make the green onions enter a period of rapid growth. During this period, field management must be strengthened to promote roots, strong trees, and soil softening. , To create a suitable growing environment for the formation of light blue, so as to improve the production and quality of green onions, in production specifically to grasp the following four points:
1. After the top-dressing watering began, the temperature gradually decreased, and the root absorption function was transferred to a vigorous period. After entering the period of growing leaf, the need for water and fertilizers increased. During the period of Liqiu-Bailu, the principle of watering was “light pouring, morning and evening pouring. "Combined with watering topdressing" leaf attack fertilizer, per acre applied cooked farmyard fertilizer 1500 kg, superphosphate 20-25 kg, potassium sulfate 10 kg, in order to promote the rapid development of leaves. After the white dew, the weather is cool, the temperature difference between day and night increases, green onions into the light blue and white formation period, is also a critical period of fertilizer management, in the white dew-equinox, topdressing with fast-acting nitrogen fertilizer, urea is good, apply about 20 kg per acre It is appropriate to add 15 kg of potassium sulfate. The principle of watering is "diligence, heavy pouring," and often keep the soil moist to meet the growing needs of light blue. After the frost falls, the weather is getting cooler, the leaf growth is slowing, and the transpiration of leaves is reduced. Watering should be gradually reduced. Watering should be stopped 7-8 days before harvest to improve the storability of green onions.
2, cultivate soil to soften the farmland cloud "If you want scallions to get up, the soil must be cultivated to the heart." The actual production shows that the deeper the green onions are, the longer the light blue. Soil cultivation is an important measure to soften leaf sheaths, prevent lodging, and increase yield and quality of light blue rice. From the beginning of the autumn to the harvest, soil should be cultivated 4 times (early autumn, summer heat, white dew, and autumnal equinox), and the thickness of each soil should be cultivated to the leaf outlet of the uppermost blade. It is advisable to not bury the heart and leaves so as not to affect the growth of green onions.
3, prevention and control of pests and diseases in time to prevent the damage of leaf miner, after the seedlings can be sprayed 1.8% avermectin EC 1500 times, or 75% ciprofloxacin 3500 times, or 72% Kelu wettable powder 600 - 800 times liquid; In the spawning period to the early stage of larval hatching, spray 20% fenvalerate EC 2000-3000 times, or 2.5% deltamethrin EC 2000 times, spray once every 7-8 days, even spray 2-3 times. On black onion leaves or purple spot, can be used 50% carbendazim WP 500 times, or 70% mancozeb WP WP 600 times, spray every 7-10 days, Continuously 2-3 times. Drugs should be used in rotation to prevent drug resistance.
4, timely harvest of farmland cloud "cold dew does not receive onions, the longer the heart and more space." Scallion should be timely harvest, early harvest, light blue is not fully inflated, resulting in reduced production, late harvest, the loss of water at the top of the pseudo-stem becomes soft, affecting the value of green onions. The south-central part of our province is generally harvested before the beginning of winter.
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