1. The scientific management of fertilizer and water in the period from the beginning of autumn to Bailu, the principle of watering is "light pouring, morning and evening pouring", combined with watering topdressing attack leaf fertilizer, applied per acre maturity farmyard fertilizer about 1500 kg, superphosphate 20 to 25 kg, potassium sulfate 10 kg, promote the rapid development of leaf. Bai Lu after the autumn equinox to fertilizer before the main fast-acting nitrogen fertilizer, urea is good, apply about 20 kilograms per acre is appropriate, increase the application of potassium sulfate 15 kg. The principle of watering is to "dilute and re-pour" to keep the soil moist and to meet the growing needs of light blue. After the frost falls, watering should be gradually reduced, and watering should be stopped 7-8 days before harvest to improve the storability of Welsh onion.
2. The soil softens the green onions and the deeper the earth, 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 three times (early autumn, summer heat, and white dew). The thickness of each soil should be cultivated to the leaf outlet of the uppermost leaf blade. Should not be buried in the heart, so as not to affect the growth of green onions.
3. Control of pests and diseases Control of leaf miner can choose 1.8% avermectin EC 1500 times or 75% ciprofloxacin WP 3500 times; spray 80% trichlorfon soluble powder from spawning to early larval hatching 800 times liquid, or 20% fenvalerate EC 2000 to 3000 times, spray once every 7 to 8 days, spray 2 to 3 times. When the leaves of scallion appear black spot or purple spot, 50% carbendazim WP can be used 500 times, spray every 7 to 10 days, 2 to 3 times in succession.
4. Timely harvest When the temperature dropped to 8 °C to 12 °C, the growth of the leaves of the onion leaves basically stopped, and the leaves turned yellow-green. Generally speaking, overwintering dry scallion should be after the frost, and the harvesting period is 15 days to 20 days before the soil is frozen.
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