1. It is strictly forbidden to turn the vine
Turning the vine will damage the stems and leaves, affect photosynthesis, reduce the accumulation of nutrients, and affect the weight gain of potato chunks. Generally, the yield is reduced by 20% to 25%, and the high is more than 30%. Therefore, sweet potatoes are not suitable for turning vines during the entire growth period. For the sweet potato fields with vigorous growth, it is advisable to control the growth by hitting the vine tips or lifting the vines gently to inhibit the formation of fiber roots, so as to avoid the consumption of nutrients by the fiber roots, improve the photosynthetic capacity of the leaves, and promote the enlargement of potato pieces.
Second, apply crack fertilizer
The tuber swelling period of sweet potatoes generally starts in late August, and cracks appear between the rows due to the swelling of the tubers. At this time, crack fertilizer should be applied to prevent premature aging of the stems and leaves and accelerate the expansion of the tubers. Nitrogen and potassium fertilizers are mainly used for irrigation. Generally, 3% to 5% potassium sulfate or 15% to 20% plant ash leaching solution is used in late August. 1% potassium dihydrogen phosphate fertilizer solution can also be used. 150 kg; or topdressing 4 to 5 kg of ammonium sulfate per mu, with 500 kg of water; or 200 to 250 kg of human excrement, 600 to 750 kg of water, and irrigating along the ridge. It can also sprinkle 150-200 kg of ash water per mu. For late-maturing and premature senescence plots, 2% NPK mixture can be irrigated.
3. Foliar spray fertilizer
In the later stage of sweet potato growth, the ability of the roots to absorb fertilizer is weakened, and spraying fertilizer on the leaves can ensure the nutrients needed for the tuber to expand. Generally, 0.5% urea solution should be sprayed on hilly sloping land or fields with premature aging; 0.2% potassium sulfate or 5% plant ash leachate should be sprayed on fields with prosperous leaf vine growth; general fields can be sprayed 0.4%～0.5% urea and potassium dihydrogen phosphate mixture. Spray 75-100 kg of fertilizer solution per mu each time. The fertilizer spraying time generally starts in mid-August, and sprays once every 7-10 days for a total of 2 to 3 sprays. The spraying time should be controlled before the evening on a sunny day. After spraying, it should be sprayed when it rains.
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