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.
After the foliar sprayed sweet potato enters the late growth stage, the absorption capacity of the root system weakens, and the foliar spray fertilizer can be classified. 0.5% urea can be sprayed on weak hilly slopes, plain sands, or fields with premature aging; 0.2% potassium dihydrogen phosphate solution can be sprayed on fields with prosperous vegetation and high fertility levels. 2%～3% of superphosphate leaching solution; 0.4%～0.5% urea and potassium dihydrogen phosphate mixture can be sprayed on the general field, sprayed once every 7-10 days, spray 2～3 times in total Spray fertilizer solution per acre 70 ~ 100 kg, spray time sunny evening is appropriate.
Fertilizer irrigation with 3% ~ 5% of potassium sulfate solution or 10% ~ 20% of the leaching liquid ash ridge irrigation into the seam, 100 ~ 150 kg per acre with fertilizer. For a field with premature aging, a 2% ternary fertilizer solution can be used.
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