1, scientific management of fertilizer
In the period from the beginning of autumn to the period of Bailu, the principle of watering is “light pouring, morning and evening pouringâ€, and the combination of watering and chasing leaves and fertilizers, applying rot about 1500 kg of farmyard fertilizer per mu, and 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. Soil softening
The deeper the onion soil, 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. Pest control
The control of leafminers can use 1.8 times of avermectin EC 1500 times or 75 percent of imafenamic acid WP 3,500 times; in the spawning period until the early stage of larvae hatching, spray 80 percent of the enemy 100 insect soluble powder 800 times, or 20 percent of fenvalerate EC 2000 to 3000 times, sprayed every 7 to 8 days, and sprayed 2 to 3 times. When the black onion leaves appear black spot or purple spot, use 50 percent of Carbendazim WP 500 times, spray every 7 to 10 days, 2 to 3 times in succession.
4. Timely harvest
Generally completed before the beginning of winter.
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