First, to promote strong trees. When the welsh onion enters the age of leaf, it should be combined with irrigation for the first time dressing, and 20 tons of urea can be topdressed with potassium nitrate or potassium dihydrogen phosphate. When the green onion into the light blue formation period, can be chasing two fertilizers respectively, with quick-acting nitrogen fertilizer, with topdressing phosphorus, potash fertilizer.
Second, earth. The cultivating soil must be carried out during the formation of light blue, otherwise it will easily cause plant rot. When the soil is cultivated, it should be gradually thickened according to the age of the seedlings. After the beginning of the fall, the soil should be cultivated once every half a month and a total of 3 to 4 times of soil should be cultivated. This is a key measure to increase the length of light blue rice. Ploughing should be carried out when the leaves are soft in the afternoon. Avoid cultivating the soil when the morning is crisp and damage the leaves. It is advisable to raise the height of the soil so as not to affect the growth of green onions. (In general, the seedlings should be lighter than the seedlings. With the increase in the number of earth-cultivation, the earth should be thicker and thicker. The thickness of each soil should be cultivated to the exit of the last leaf, and the last earth should generally be 15 cm above the ground. Must not bury the heart and leaves, so as not to affect the growth of green onions and cause root and plant rot.
Third, the prevention of pests and diseases. The high-temperature stage is the growth and decline of green onions, and is susceptible to diseases, mainly on onion downy mildew and disease. It is recommended to spray 1500-times of amidoxal or 1000 times of bisprozion or 500-fold of chlorothalonil in the seedling-seeding period of transplanting, and then add streptomycin, which can effectively prevent fungal and bacterial diseases.
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