From late July to early September, sweet potato roots are inflated. This period of time is the key period for the formation of yield, and it is also the period when most fertilizer is needed. The following three methods can be used for top dressing.
Eye hole dressing method: In the 20 ~ 30 cm from the main root of sweet potato, hit a hole about 30 cm deep, apply the amount of ternary compound fertilizer, and sealed with wet soil. If you drill a hole on both sides of the ridge, the effect is better. This method can increase production by about 20% per mu.
Crack dressing method: When the sweet potato expands and cracks appear on the ground, 0.5 kg of potassium dihydrogen phosphate per acre is used to water 400 kg, or 2.5 kg of urea and 10 kg of superphosphate are replenished with 500 kg of water. , Each irrigation 0.7 to 1 kg. After 15 days, 100 kilograms of plant ash plus 500 kilograms of water per acre were soaked for 4 hours. The supernatant was poured into the cracks, and the cracks were sealed with soil after irrigation.
Foliage Top Dressing: Foliar spraying 0.3% potassium dihydrogen phosphate solution, spraying once every 7 days. This method can increase production by 18% to 20% per mu.
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