How to manage in the later stage of growing sweet potatoes?

How to manage in the later stage of growing sweet potatoes? Please guide that in late August, the growth of sweet potato stems and leaves slows down, the growth center gradually changes from above ground to underground, and the root tuber begins to expand rapidly. In management, it is necessary to control the excessive growth of stems and leaves, coordinate the relationship between aboveground and underground growth, promote root expansion and obtain high yield. Irrigation and drainage: this period is in the rainy season and generally does not need watering. However, in case of drought, it will cause premature senescence of stems and leaves, affect the formation and accumulation of carbohydrates, and reduce yield. Therefore, it is necessary to replenish watering according to the development of drought. The watering method can be watered with small ditches to relieve the drought. It can adjust fertilizer with water, promote the balanced growth of stems and leaves, expand the photosynthetic area and increase the photosynthetic products. Accelerating the speed of nutrient transport is beneficial to the expansion of root tubers. If there is too much autumn rain, the formation of waterlogging, timely drainage, to prevent stagnant water in the field, not only increased water content, not resistant to storage, but also because the stagnant water for a long time will cause "hard heart" rot, reduce the quality. Topdressing "crack fertilizer": sweet potato "crack fertilizer" is a fertilization method to pour fertilizer along the crack on the ridge. In late August, the End of Heat was applied before and after. On the one hand, it can meet the nutrients needed for tuber expansion and promote the root expansion. On the other hand, it can prevent premature senescence of stems and leaves, enhance photosynthesis and increase nutrient accumulation. According to the experiment, the yield of sweet potato can be increased by about 30% after topdressing "crack fertilizer". The amount of fertilizer can be determined according to the growth of potato vines. More topdressing should be applied to the fields with the trend of premature senescence. If there is enough fertilizer in the early stage, the fields with strong potato vines can be applied less. General fields per mu can be traced to 200 kg of rotten human feces and urine to 500 kg of water, or urea 5mur7 kg to 500 kg of water. In the method of fertilization, the configured fertilizer liquid can be drenched along the crack, and the soil will be cultivated immediately after the fertilizer liquid is drenched, and the soil of the ridge and furrow will be broken and cultivated at the crack on the ridge surface. Extra-root fertilizer: in the later stage of sweet potato growth, 1% Mel 2% urea solution, 0.3% Mel 0.5% potassium dihydrogen phosphate solution, or 5% Mel 10% plant ash leaching solution can be sprayed after 5: 00 p.m. Spraying 60 Mu 80 kg per mu, every 10 days, continuously spraying 2 Mu for 3 times, the effect of increasing yield was significant. Click to get more sweet potato planting techniques click to get more vegetable planting techniques