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According to the calculation, for every 1000 kg of green onions, about 3 kg of nitrogen should be absorbed, 0.5-0.6 kg of phosphorus and 3-3.7 kg of potassium. In addition to a large number of elements, the application of medium and trace elements of calcium, magnesium, boron, manganese fertilizers, have a certain role in promoting the growth and development of green onions.
Fertilization at seedling stage Before planting, fertilized organic fertilizer is applied to the nursery nursery. Generally, 2000-3000 kg of compost is applied per mu, 40-60 kg of superphosphate is applied, and the soil is deep after application, and the sputum is fine and sputum. In order to keep the seedlings safe for the winter, water should be poured before freezing. A few days later, spread the fine horse manure or soil fertilizer on the surface of the clam, about 1 cm thick, so as to prevent freezing and keeping. After returning to the green seedlings, each acre can be used to apply 2000-3000 kg of soil fertilizer, or 10-15 kg of ammonium sulfate or 6 kg of urea.
Applying the base fertilizer Before the green onions are planted, the base fertilizer should be applied. Generally, 4000-5000 kg of manure can be applied per acre. After deep tillage, the soil and fertilizer are fully mixed evenly. After leveling well, ditch by row spacing, apply 100-150 kg of cake fertilizer per acre, or 1000 kg of human excrement, and then mix the soil and fertilizer. Loosen and colonize.
Timely topdressing After the fall, it is necessary to topdress in time, and apply organic fertilizer and quick-acting fertilizer together. The first top dressing, apply 4000 kg of soil fertilizer per acre on the back of the ridge, or apply 150 kg of cake fertilizer and 3000 kg of fire soil fertilizer. Immediately after application, it should be shallowed once and watered once. After 15 days, carry out the second top dressing, apply 750 kg of decomposed manure per acre, or apply 20-25 kg of ammonium sulfate, 10-20 kg of superphosphate, and 10-20 kg of potassium sulfate. After fertilization, the soil is combined with sorghum and then watered. After 25-30 days, carry out the third top dressing, apply 15-25 kg of ammonium sulfate or 7-10 kg of urea per acre, watering after topdressing and cultivating the soil.
After the autumn, the green onions need to be topdressed in time.
After the autumn, the crop enters an important period of growth and development. Guo Zhiqing, a researcher at the College of Horticulture of Northwest A&F University, reminded farmers that the cultivation of green onions should master the rules of fertilizer and scientific fertilization.
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