Potassium fertilizer is applied to the roots of sweet potato in the later period of growth. 30-40 kg of potassium sulfate or 25-30 kg of potassium dihydrogen phosphate is applied per acre. Potassium fertilizer is evenly spread on the soil around the roots of autumn sweet potato plants. 15-20 cm thick soil, covered with potash. It can also be equilibrated with 50-60 times of water or biogas slurry or decomposed human and animal fecal water, and evenly applied to the soil around the roots of autumn sweet potato plants. In addition, while applying fertilizer to the roots, it is necessary to spray the leaves with 3-5 times of 0.3%-0.5% potassium nitrate aqueous solution or 300-500 times of potassium dihydrogen phosphate aqueous solution, or 25-30 times of dry pure grass ash leaching clear liquid. 7-10 days spray once, evenly spray all the stems and leaves, in order to start dropping drops is appropriate, from the foliage to add potassium, is conducive to autumn sweet potato enlargement and weight gain.
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