   A: After 40 days of planting purple sweet potato, carry out cultivating and chasing potato fertilizer, and apply 20 kg of nitrogen and potassium fertilizer per acre . The fertilization of the potato vine can be carried out with a foliar fertilizer such as 0.2 % potassium dihydrogen phosphate per acre , and sprayed every 7 to 10 days.
In the midsummer, we must control the growth of vines. When the vine grows to 60 cm, spray paclobutrazol or chlormequat in the afternoon. Apply 15% paclobutrazol 30 g per sprayer ( 15 kg) , spray once every 10 days, and spray 2 to 3 times. . In the middle and late period ( August to September ), sweet potato swell can be sprayed 2 to 3 times to promote rapid expansion of tubers. (Li Bo)
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