Winter onions are prone to lodging. If there is much rain and humidity, the lodging will be more serious. The main reason is that the onions planted in winter grow vigorously, have less light, and the plants are softer. It is recommended to control nitrogen fertilizer and increase phosphorus and potassium fertilizer. This can effectively control plant growth, increase plant hardness, and prevent lodging. The specific method is as follows.
When the spring onions are 7-10 cm, 15-20 cm, 25-30 cm, each root is sprayed once with 300-500 times potassium dihydrogen phosphate aqueous solution or 800-1000 times starpone potassium potassium No. 1 aqueous solution. Apply 8 to 10 kilograms of rice, and apply it evenly to the soil around the roots of the plants. It is advisable to completely infiltrate the soil with fertilizer solution. At the same time, supplement the phosphorus and potassium fertilizer from the foliage. Every 7 to 10 days, foliar spray 25 to 30 times of superphosphate and dry and pure grass ash mixed leaching clear solution, or 1000 times of green Fenway No. 1, 1000 times of green Fenway No. 3, or 0.2% to 0.3% An aqueous solution of potassium dihydrogen phosphate, or an aqueous solution of 800 to 1,000 times the starpone potassium potassium solution, is sprayed continuously 3 to 5 times.
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