The root expansion period of the cracked fat red sweet potato is generally started from August, and cracks appear due to the enlargement of the roots. At this time, the crack fertilizer should be applied to prevent premature senescence of the stems and leaves and accelerate the expansion of the potato pieces. The application of nitrogen and potassium fertilizers is mainly carried out, generally using 3% to 5% potassium sulfate or 15% to 20% of ash ash leaching solution, or 1% potassium dihydrogen phosphate fertilizer solution, 100 to 150 kg per acre of fertilizer; or 4 to 5 kg of ammonium sulfate per acre, 500 kg of water; can also be used 200 to 250 kg of human excrement, 600 to 750 kg of water, applied to the ridge filling. It can also spray 150-200 kg of grass ash water per acre. A 2% NPK mixture can be applied to plots with late maternal premature aging.
It is strictly forbidden to turn over the vines and damage the stems and leaves, affecting photosynthesis, reducing the accumulation of nutrients, and affecting the weight gain of the potato tubers. Generally, the yield is reduced by 20% to 25%, and the high is more than 30%. Therefore, sweet potatoes should not be vinened throughout the growth period. For the growing sweet potato field, it is better to use the method of vine tip or light vine to control the growth and inhibit the formation of fiber roots, so as to avoid the consumption of nutrients by fiber roots, improve the photosynthesis ability of leaves, and promote the expansion of potato chips.
Drought-proof drainage encounters dry weather in the late stage of sweet potato growth. The conditional areas should be watered by furrows, fertilize water, promote stem and leaf growth, enlarge photosynthetic area, increase photosynthetic products, and facilitate root enlargement. However, it is not advisable to water the water within 20 days before harvest to avoid reducing the storage stability of sweet potato roots. If you encounter autumn sputum, you should clear the ditch and drain in time to prevent the potato pieces from being stained, and form hard heart rot and lead to reduced production.
In the late growth stage of foliar fertilizer, the ability of roots to absorb fertilizer is weakened, and foliar spray fertilizer can ensure the nutrients needed for root enlargement. Generally, hilly slopes or fields with premature aging should be sprayed with 0.5% urea solution; those with prosperous leaves should be sprayed with 0.2% potassium sulphate or 5% ash ash; general fields can be sprayed 0.4% to 0.5% of a mixture of urea and potassium dihydrogen phosphate. 75-100 kg of spray fertilizer per acre. Spraying time generally starts from mid-August, spray once every 7 to 10 days, a total of 2 to 3 times, the time of spraying should be carried out before the sunny evening, after the spray, it should be sprayed.
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