Sweet potato topdressing technology

From the end of August to the beginning of October, the sweet potato roots are in the expansion period. This period is the key period for the formation of yield. The most suitable period for fertilizer is the following three methods: 1. Eye-hole topdressing method: use a wooden raft to hit 20__30 cm from its main root. A hole of about 30 cm deep into the right eye into the appropriate amount of three-element compound fertilizer and sealed with wet soil. 2: crack topdressing method: when the sweet potato expands the ground cracks, 500 grams per mus of diammonium plus 400 kg of water is formulated into a fertilizer solution Plant 0.7_1 kg. 3: Foliar topdressing method: Foliar spraying 0.3% potassium dihydrogen phosphate aqueous solution once a week, this method can increase yield by 18% _20%.

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