From mid-August to early-October, it is the period of sweet potato root expansion in spring and summer. This period is the key period for the formation of yield, and it is the period with the most need for fertilizer. The following three methods can be used for top dressing. With a significant increase in production, generally about 18-20% per 667 square meters, economic benefits are also significant.
First, the hole with a piece of wood picking fertilizer, in 20-30 centimeters away from its main root, playing a deep hole about 30 cm, into the appropriate amount of three-element compound fertilizer, and sealed with wet soil, if played on both sides of its ridge A hole, the effect is better.
Second, cracks, fertilizers, sweet potato expansion occurs when the cracks, every 667 square meters with 500 grams of potassium dihydrogen phosphate, 400 kg of water, or urea 2.5 kg and 10 kg of superphosphate, add 500 kg of water, dubbed fertilizer solution irrigation cracks, each 0.7-1 kg of strain. After half a month, 500 kg of water and 500 kg of water (soaked for 4 hours) were used every 667 square meters, and the filtered liquid was irrigated and sealed.
Third, foliar fertilizer spraying foliar spraying 0.3% potassium dihydrogen phosphate, or 0.3% superphosphate and urea aqueous solution, spraying 7-10 days.
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