The end of the rainy season in late August is an important period for the growth of vegetables in the fall, and field management should be strengthened. The center of lush green field management is to promote roots, strong trees and soil softening, strengthen fertilizer and water management, and create suitable environmental conditions for the formation of light blue, so as to improve the production and quality of green onions.
1. Watering: After the scallion is planted, it enters the high temperature season. At this time, the management center is to promote rooting. Watering should be controlled, and the water should be drained after the rain to prevent rot, yellow leaves and dead seedlings. At the same time, the cultivator should be strengthened to promote root growth. . Between the beginning of the autumn and the White Dew Festival, the principles of pouring, watering in the morning and evening should be mastered. After the white dew, green onions enter the growth stage. The principle of ground pouring and heavy pouring should be mastered for irrigation, and water should be poured every 4 to 6 days. After the frost falls, the temperature drops, the onion basically grows, the water requirement decreases, and the soil is kept moist. Stop watering 5 to 7 days before harvest to facilitate harvesting.
2, top dressing: Welsh onion basis in the application of base fertilizer but also phase fertilizer. After the beginning of autumn, when plant growth speeds up, topdressing "foliar manure", per acre Shi Man farmyard fertilizer 1500 ~ 2000 kg, superphosphate 20 ~ 25 kg, promote leaf growth. After the White Dew Festival, it enters into a period of vigorous growth, which is the key period for the development of welsh onion production. It should be combined with watering and topdressing “attacking the tree-fertilizer†twice. Each time, urea 15-20 kg and potassium sulphate 10-15 kg should be applied. Sprinkle between rows, water after shallow cultivator.
3. Earthing: Earthing is an important measure to soften leaf sheaths, prevent lodging, and increase light blue yield and quality. From the autumn festival to the harvest, generally three times of soil cultivation, the former two combined with cultivator, the ridge into the onion ditch, filling the ditch at the end of summer; the height of each cultivating scallion, should be based on the height of pseudostem growth, each time 3 to 4 cm, the soil will be cultured to the leaf outlet at the top of the blade, and the heart must not be buried to prevent the leaves from rot.
4. Disease prevention: To prevent the damage of leaf miners, every 8 to 10 days after seedling soaking, spraying 1 dimethoate (15 milliliters of water per 15 kilograms of water plus dimethoate), and brown leaf spot or gray spot disease on the leaves of the onion. Can be used 1000 times carbendazim spray control.
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