In the late growth stage of sweet potato, rational fertilization can prevent premature aging of plants, promote nutrient transfer to roots, and increase yield. Foliar spraying fertilizer After the sweet potato enters the late growth stage, the root absorption capacity is weakened and the foliar spray can be classified. 0.5% urea solution may be sprayed on weak hilly slopes, plain sands, or fields with premature aging; 0.2% potassium dihydrogen phosphate may 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, and sprayed 2～3 times. Each spray of fertilizer solution per acre 70 to 100 kg, suitable for a sunny evening. Cracking fertilizer When sweet potato expands on the ground, cracks occur when using human and animal dung and urine 750 to 1000 kg plus 500 kg of water, or 500 g of potassium dihydrogen phosphate to add water to 400 kg or 2.5 kg of urea and 10 mg of superphosphate to add 500 kg of water. Into the cracks, each irrigation 0.7 to 1 kg. After 15 days, cracks were re-used with the supernatant of the plant ash (100 kg of plant ash plus 500 kg of water per mu for 4 hours, and the filtered supernatant was poured into the cracks). When the application of cracking fertilizer slow, after the application of topsoil seal cracks.
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