Green onions: reasonable soil and anti-corrosion
First, promote roots and strong trees. When the green onion enters the hairy stage, the first top dressing should be combined with irrigation, and 20 kg of urea can be applied to the mu, and potassium nitrate or potassium dihydrogen phosphate can be applied. When the green onions enter the period of onion formation, they can be chased twice with fertilizer, with quick-acting nitrogen fertilizer as the main factor, and with phosphorus and potassium fertilizer.
Second, the soil. The cultivating soil must be carried out during the formation of scallion, otherwise it will easily cause the plant to rot. When cultivating the soil, it should be gradually thickened according to the age of the seedlings. After the autumn, the soil should be ploughed once every half month, and the soil should be ploughed 3 to 4 times. This is the key measure to increase the length of the scallion. The soil should be carried out in the afternoon when the leaves are soft. Avoid cultivating the leaves when the morning is crisp. The height of the soil should not be buried in the heart, so as not to affect the growth of the green onions. (Generally, the seedlings should be shallower. The soil is thicker and thicker with the increase of the number of soils. The thickness of each soil is preferably to the exit of the top one. The last time the soil should be grasped 15cm above the ground. Do not bury the heart leaves, so as not to affect the growth of green onions and cause roots and plant decay.
Third, the prevention of pests and diseases. The high temperature stage is the growth and decay period of the green onion, which is easy to infect diseases, mainly the onion and mildew disease and disease. It is recommended that spraying 1500 times solution of ampicda or 1000 times solution of bis-formylamine or 500 times solution of chlorothalonil in the slow seedling stage, and then adding streptomycin, can effectively prevent fungal and bacterial diseases.
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