The late growth period of sweet potato is the key period for determining the yield. To do this, it is necessary to apply good fertilizer to increase the yield.
Foliar spraying fertilizer. After the sweet potato enters the late growth stage, the absorption capacity of the root system weakens, and foliar fertilization can be performed. For plots with premature aging, 0.5% urea water can be sprayed; plots with prosperous and fertile soils can be sprayed with 0.2% potassium dihydrogen phosphate solution or 2%-3% calcium superphosphate leachate; The plot can be sprayed with a 0.4%-0.5% mixture of urea and potassium dihydrogen phosphate, sprayed once every 7-10 days, sprayed 2-3 times, sprayed with 70-100 kg of fertiliser per acre. The time is appropriate for sunny evenings. Skillfully applying big fertilizer. During the expansion of potato wedges, when there is a crack in the surface soil layer, 500 grams of potassium dihydrogen phosphate can be used per mu, 500 kg of water can be poured into the cracks in the soil, or 2.5 kg of urea and 10 kg of superphosphate can be used per acre. Kilogram irrigation, promote potato block expansion. For lands with a tendency to premature aging, a 2% ternary fertilizer solution can be applied.
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