In the cultivation of sweet potatoes, how to do a good job of fertilization will make your sweet potato more productive. After the foliar sprayed sweet potato enters the late growth stage, the absorption capacity of the root system is weakened, and the foliar spray can be categorized and fertilizer can be used to increase the yield of sweet potato. The following situations are mainly involved:
1. 0.4%-0.5% urea and potassium dihydrogen phosphate mixture can be sprayed on the general plots, sprayed once every 7-10 days, and sprayed 2-3 times, each time spraying fertilizer solution per acre 70 -100 kg, spraying time is suitable for sunny evening.
2. For fields with prosperous growth and high levels of fertility, 0.2% potassium dihydrogen phosphate solution or 2%-3% superphosphate calcium leaching solution can be sprayed.
3. 0.5% urea can be sprayed on weak hilly slopes, plain sands, or fields with premature aging. Fertilizer irrigation with 3% -5% potassium sulphate solution or 10% -20% of the ash leaching liquid is applied along the ridge irrigation, 100-150 kg of fertilizer solution per acre. For a field with premature aging, a 2% ternary fertilizer solution can be used.
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