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1. Watering welsh onion after entering the summer season after planting, the management center of gravity at this time is to promote root, should control watering, water drainage after flood prevention, prevent rot, yellow leaves and dead seedlings; at the same time strengthen the cultivator, and promote root growth. Between Liqiu and Bailu, the principle of light pouring and watering in the morning and evening shall be mastered for irrigation; after the white shallots enter into the prosperous period, the irrigation shall master the principles of pouring and re-watering, pouring water once every 4 to 6 days; after frost When the temperature is lowered, green onions are basically grown up, the water requirement is reduced, and the soil is kept moist; watering is stopped 5 days to 7 days before harvest, which is conducive to harvesting and transportation.
2. Dressing green onions is also based on the application of basal fertilizer but also phase fertilizer. After the beginning of autumn, when the growth of plants is accelerated, topdressing "foliar manure" is applied, and culturing manure fertilizer per acre is 1,500 to 2,000 kilograms, and superphosphate is 20 to 25 kilograms to promote leaf growth. After the white dew, it enters the period of intensive growth, which is the key period for the development of welsh onion production. It should be combined with watering to top up the “attacking tree fertilizers†twice. Each time, the application of urea from 15 to 20 kilograms, potassium sulfate from 10 to 15 kilograms, and so on. Between rows, water after shallow cultivator.
3. Earthing soil is an important measure to soften leaf sheaths, prevent lodging, and increase light blue yield and quality. From the beginning of the autumn festival to the harvest, the soil is usually cultivated three times. The previous two times combined with cultivator, the ridges of soil were plunged into the onion ditch, and the ditch was filled after the summer heat. The height of each onion shall be determined according to the height of the growth of the pseudo-stem, and each time 3 cm to 4 cm, the soil shall be cultivated to the leaves of the uppermost blade, and the heart shall not be buried to prevent the leaves from decaying.
4. Disease prevention In order to prevent the damage of leaf miners, every 8 days to 10 days after the seedlings are sprayed, dimethoate is sprayed once (15 milliliters per 15 kilograms of water plus dimethoate), and brown spots or gray spot disease may occur in the leaves of the onion. Times of carbendazim control.
Onion Fall Field Management
The end of the rainy season in mid-August is an important period for the growth of autumn vegetables. The focus of the 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, thus improving the yield and quality of green onions.