From late August to early October, it is the period of expansion of sweet potato roots. 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: 1. Eye hole top dressing method: use a piece of wood pickaxe, away from it At the main root 20__30 centimeters, hit a hole about 30 centimeters deep, enter the appropriate amount of three-element compound fertilizer, and seal well with wet soil. 2: Crack top dressing method: When sweet potato expands on the ground, cracks appear when 500 grams of diphosphoric acid per acre is used. 400 kg of water was added, and a fertilizer solution was used to fill the cracks. Each plant was 0.7_1 kg.3: foliar dressing: 0.3% potassium dihydrogen phosphate aqueous solution was sprayed on the leaves and sprayed once a week. This method increased the yield by 18%-20%.
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