How does the onion grow after the beginning of autumn?
Fertility requirements According to calculations, each 1,000 kg of scallion will need to absorb about 3 kg of nitrogen, phosphorus 0.5-0.6 kg, and potassium 3-3.7 kg. In addition to a large number of elements, the application of trace elements calcium, magnesium, boron, manganese fertilizers, have a certain role in the growth and development of Welsh onion.
Before the fertilization seedlings are sown at the seedling stage, the organic fertilizer is applied to the nursery seedlings. Generally, 2000-3000 kilograms of compost and 40-60 kilograms of superphosphate are applied per acre. After the seedlings are applied, they are deep-turned, and the seedlings are removed. In order to keep the seedlings safe for winter, water should be poured before freezing. A few days later, sprinkle the finely-divided horse dung or earth-fertilizer on the ravioli, about 1 cm thick, in order to prevent freezing. After returning to young crops, 2000-3000 kilograms of soil-fertilizer can be applied per acre, or 10-15 kilograms of ammonium sulfate or 6 kilograms of urea can be applied.
The basal fertilizer should be applied before the scallion is planted. Generally, 4000-5000 kilograms of manure can be applied per acre. After deep plowing, the soil fertility is fully mixed. After leveling, the ditch is opened by row spacing, and 100-150 kilograms of cake fertilizer or 1,000 kilograms of human waste is applied per acre. Then the soil is mixed thoroughly. Loosening and colonization.
In a timely manner, it is necessary to top-dress fertilizers immediately after the beginning of autumn and apply organic fertilizers and quick-acting fertilizers. For the first time, fertilizer was applied at a rate of 4,000 kilograms per mu for ridge backs, or 150 kilograms of cake fertilizer and 3,000 kilograms of fertiliser were applied. After the application, the water was poured once and watered once. After 15 days, the second topdressing was performed, and 750 kilograms of human excrement per acre was applied, or 20-25 kg of ammonium sulfate, 10-20 kg of superphosphate, and 10-20 kg of potassium sulfate were applied. After fertilization, the soil is mixed with sorghum and then watered. After 25-30 days, the third fertilizer application is conducted. Apply 15-25 kg of ammonium sulfate or 7-10 kg of urea per acre. After top dressing, water and soil.
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