(1) Spray “Tianda—2116â€: After planting the onion seedlings, spray 600 times “Tianda—2116†(special type for rhizome), once every 10-15 days, even spray 2 times to promote hair roots. To improve the cold resistance, disease resistance and adaptability of plants. Continue to spray after re-greening, once every 15-20 days, for 2-4 consecutive times, improve the photosynthetic efficiency and disease resistance of plants, and promote high yield and quality.
(2) Management before winter: After planting, water the seedlings first, and after 2-3 days, carefully draw the soil to promote the growth of the roots. Before freezing, it is necessary to re-water the winter water, and then carefully draw the soil. After the hoe, push the topsoil with the slab to improve the ground temperature and protect the sputum, and protect the winter by the soil dung or wheat stalks and grass.
(3) Management of the returning period: After the convulsions, the temperature starts to rise, and it is necessary to remove the grass and raise the ground temperature. When the onion seedlings return to green, combined with watering for topdressing, each mu is fertilized with 1000-1500 kg of decomposed manure, or 10-15 kg of urea, or 15 kg of potassium sulfate compound fertilizer. When the dry soil is exposed on the surface, it is immediately drawn, and the rhizosphere soil is cleaned by combining the sputum, so that the rhizome is exposed to facilitate the growth of the onion. Before and after the Qingming period, the leaves entered a prosperous growth period, once again watering and topdressing, and applying 10-15 kg of urea or potassium sulfate compound fertilizer per acre. Note that the amount of fertilizer should not be too large, and appropriate seedlings for about 10 days in the future, so as not to affect the growth of onion.
(4) Management of bulb expansion period: After the rainy season, when the temperature reaches 20 °C, the onion begins to expand. It needs to be topdressed again with watering, and 20-25 kg of urea or potassium sulfate compound fertilizer per mu. After the summer, the bulb enters the rapid expansion period, and can be combined with watering to apply the decomposed manure 1000 kg/mu or potassium sulfate compound fertilizer 10-15 kg/mu, and increase the number of watering, every 3-5 days, until 1 Stop 7 days before harvest.
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