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After the foliar fertilizer sweet potato enters the late growth stage, the root absorption capacity is weakened, and foliar spray fertilizer can be applied. For the weak hilly slopes, plain sands or fields with premature aging tendency, 0.5% urea solution can be sprayed, and 0.2% potassium dihydrogen phosphate solution can be sprayed on the fields with high growth potential and high fertility level. 2% to 3% of superphosphate leaching solution, generally 0.4% to 0.5% of urea and potassium dihydrogen phosphate mixture can be sprayed on the field, sprayed once every 7 to 10 days, a total of 2 to 3 times, Spraying 70-100 kilograms of fertilizer per acre, the spraying time is suitable for sunny evenings.
The fertilizer water is filled with 3% to 5% potassium sulphate solution or 10% to 20% of ash ash leaching solution for ridge irrigation, and the fertilizer solution is 100-150 kg per mu. For the field with premature aging trend, it can be applied with 2% ternary compound fertilizer solution.
In the late growth stage of sweet potato, reasonable fertilization can prevent premature senescence of the plant, maintain the assimilation ability of the leaves, and promote the transport of nutrients to the roots, thereby increasing yield.
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