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Fertilization Techniques in the Late Growth Stage of Sweet Potato
In the late growth stage of sweet potato, rational fertilization can prevent premature aging of plants, maintain the assimilation ability of the leaves, and promote the transfer of nutrients to roots, thereby increasing yield. First, foliar spray fertilizer. After the sweet potato enters the late growth stage, the absorption capacity of the root system is weakened, and foliar spray can be performed. 0.5% urea can be sprayed on weak hilly slopes, plain sands, or fields with premature aging, and 0.2% potassium dihydrogen phosphate solution can be sprayed on plots with prosperous vegetation and high fertility levels. 2% to 3% of superphosphate calcium leaching solution, the general field can be sprayed with 0.4% to 0.5% of urea and potassium dihydrogen phosphate mixture, spraying every 7 to 10 days, a total of 2 or 3 times, Each spray of fertilizer solution per acre of 70 to 100 kg, spraying time is appropriate for a sunny evening. Second, fertilizer irrigation. With 3% to 5% of potassium sulfate solution or 10% to 20% of the ash leaching solution was applied along the ridge, 100 to 150 kg of fertilizer solution per acre. For a field with premature aging, a 2% ternary fertilizer solution can be used.