Phosphorus and potassium fertilizer for winter onions
Winter onions are prone to lodging. If there is much rain and humidity in winter, 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 with starpone potassium potassium No. 1 aqueous solution. Apply 8-10 kg / m2, and evenly apply it to the soil around the roots of the shallot plants. It is advisable that the fertilizer solution completely penetrates into the soil. 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 plant ash mixed leaching clarified 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 continuously sprayed 3 to 5 times, and all the stems and leaves are evenly sprayed, and it is advisable to start to drip water drops.
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