Fertilization technology of green onion seedling

      Cultivating strong seedlings is the main task of growing onions. Seedbed soil fertility directly related to the quality of the seedlings. The nursery site should use flat terrain, fertile soil, convenient irrigation and drainage, and deep soil in the cultivation layer. It is necessary to pay attention to the application of decomposed soil and fertilizer, and the fertilizer as base fertilizer. Generally , 2000-3000 kg per 667 square meters , superphosphate 40-60 Kilograms, spread on the ground before the preparation of the ground, and then shallow tillage, so that the organic fertilizer and soil are fully mixed, leveling and sown after sowing. When planting, each 667 square meters can be applied with 5 kg of urea or 12 kg of compound fertilizer for seed fertilizer, and the mixture is evenly mixed, so that the seed fertilizer and the soil are evenly mixed to avoid injury. However, the seedbed soil should not be fertilized too much, especially when planting early and when the amount of sowing is small, it is even more difficult to apply fertilizer. Excessive fertilization will cause the pre-winter seedlings to be too large. During the winter, the low temperature will easily induce low temperature. After wintering, the flower buds will differentiate, and the phenomenon of early convulsion will occur, which will affect the yield. The growth of the green onion seedlings before wintering is small, and the amount of fertilizer is small. Under the premise of applying the base fertilizer to the seedbed, the fertilizer should be controlled before wintering to prevent the seedlings from being too large or long, and generally not fertilizing or watering. During the wintering period, when the soil begins to freeze, it can be combined with watering, chasing a small amount of nitrogen and phosphate fertilizer, and laying 1-2 cm thick horse manure and circle fertilizer on the ground to make the seedlings safely winter. The following year the end of February, onion seedling root and leaf have begun activities, conditions can be 667 square meters per lap miscellaneous fertilizer applicator crushing 2000 kg in the morning, help soil moisture insulation, and promote seedling early onset. After the green onion seedlings return to green, the growth of seedlings gradually increases, and the demand for fertilizer and water also increases, which is a crucial period for cultivating strong seedlings. If the winter water is not topdressed before wintering, it can be combined with pouring green water to trace the returning green fertilizer, which is called “lifting seedling fertilizer” to promote seedling growth. Generally , about 10 kilograms of ammonium sulfate is applied per 667 square meters . If the phosphate fertilizer is insufficient, it can be combined with the application of superphosphate. It can be applied with 2000-3000 kilograms of soil fertilizer , or mixed with bauxite, wall soil and circle fertilizer. Seedlings thrive in the early and mid recover a quick result may each nitrogen, to 667 square meters per kilogram 5-10 with ammonium sulfate, urea, or 3-5 kg, induce strong healthy seedling growth. However, before planting, it is necessary to pay attention to controlling the fertilizer and water, to prevent the onion seed from being tender and to reduce the survival rate after planting.