The excessive fertilizer and water in the potato fields, especially excessive nitrogen, often cause stems and leaves to prosper, affecting the swelling of the roots and reducing the yield. In practice, gallbladder is sprayed on plant growth inhibitors such as paclobutrazol or diaminotolamine in potato fields, which can play a role in promoting control.
The first time before the general rainy season comes, spray once every 10-15 days and spray 3-4 times. Each mu of paclobutrazol 50-100 grams or 7-15 grams of dilute amine, 50-75 kg of water evenly sprayed. When spraying, the dosage of medicinal drugs can be flexibly adopted according to the growth of stems and leaves, the size of rainfall, the characteristics of varieties, and soil fertility.
Sweet potato is based on the application of basal fertilizer, top dressing with irrigation cracks and foliar spray fertilizer. After recovering the cracks, there are 4-5 kg ​​of urea, 10 kg of super-calcium leaching solution, 3 kg of potassium sulfate, and 150-200 kg of water. When the cracks are generally started in the field, they should be carried out on a cloudy or sunny afternoon. Trees along the cracks are poured and require uniform application. Foliar spray fertilizer according to the growth of the plant, the growth of weak signs of premature aging with nitrogen spray, with phosphorus, potassium fertilizer, with 100 kg of water 0.5 kg of urea, 0.2 kg of potassium dihydrogen phosphate, stirring spray. The main spraying phosphorus and potash fertilizers that are growing prosperously can be sprayed with 0.2% potassium dihydrogen phosphate solution. Can use a pack of sweet potato swelling agent, add 20 kg of water to dissolve and filter, then evenly spray the leaves of the plants and spray twice, each time for about 10 days. In case of autumn drought, timely irrigation can prevent premature aging, prolong the functional period of the leaves, and increase the root swelling rate.
Sweet potato Xifeng wolfberry, irrigation volume should not be too large, about 40 cubic meters per mu. Do not step on the potato ridge after irrigation, so as not to affect soil permeability. In addition, to achieve high yields of sweet potatoes, we must also cooperate with the selection of improved varieties, chemical weed control, pest control and other measures.
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