The sweet potato planting is the key in the later stage. Rational fertilization can prevent the plant from premature aging, maintain the assimilation ability of the leaves, and promote the transportation of nutrients to the roots, thus increasing the yield.
Foliar spray fertilizer: After the sweet potato enters the late growth stage, the absorption capacity of the root system is weakened, and the leaf surface spray can be classified, mainly in the following cases: Co.,
1. For the general field, spray 0.4% to 0.5% of urea and potassium dihydrogen phosphate mixture, spray once every 7 to 10 days, spray a total of 2 to 3 times, spray a fertilizer solution of 70 per acre. ~100 kg, spraying time is suitable for sunny and evening.
2. 0.2% potassium dihydrogen phosphate solution or 2% to 3% superphosphate leaching solution may be sprayed on fields with high growth potential and high fertility level.
3. 0.5% urea solution can be sprayed on the hilly slopes, plain sands or fields with premature aging tendency.
Fertilization of fertilizer water: Use 3% to 5% potassium sulphate solution or 10% to 20% of ash ash leaching solution to apply for ridge irrigation, and use 100-150 kg of fertilizer solution per mu. For the field with premature aging trend, it can be applied with 2% ternary compound fertilizer solution.
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