Autumn planting green onions management rules
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 application of fertilizer, the temperature gradually decreased after the beginning of autumn, and the root absorption function was transferred to a vigorous period. After entering the peak stage, the need for water and fertilizer increased. During the period from the beginning of autumn to 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 to the equinox, topdressing with fast-acting nitrogen fertilizer, with urea as the best, about 20 kg per acre Shi 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 the leaf surface is reduced. Watering should be gradually reduced. The watering should be stopped 7-8 days before harvest to improve the storability of Welsh onion.
2. Cultivate the farmland to soften the cloud: "If we want to get up, we must cultivate the soil." 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. Prevent pests and diseases in time to prevent the damage of leaf miners. After easing seedlings, it can spray 1.8% avermectin EC 1500 times, or 75% ciprofloxacin WP 3500 times, or 72% Kelu WP 600~ 800 times liquid; In the spawning period to the early stage of larval hatching, spray 2.5% deltamethrin EC 2000 times, every 7 to 8 days spray once, and even spray 2 or 3 times.
On black onion leaves or purple spot, can be used 50% carbendazim WP 500 times, or 70% mancozeb WP wettablet 600 times, every 7 to 10 days spray 1, Continuous 2 or 3 times. Drugs should be used in rotation to prevent drug resistance.
4, timely harvest of farmer's 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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