Key points of medium-term Management of seed Sweet Potato

Most areas of drought prevention and drainage are hot and rainy, the stems and leaves on the ground of sweet potato grow rapidly, and the nutrients go up but not down. At this time, attention should be paid to drainage, that is, timely removal of stagnant water on the ground after rain to control the vigorous growth of the aboveground. A number of droughts require watering to prevent drought, so that potato cubes can expand rapidly in non-wet and dry soil.

Lift the vine to break the root, can not turn the vine in the high temperature and rainy season, the soil moisture is too high, some sweet potato varieties take root too much, especially in the high fertilizer paddy field, the sweet potato white root is many and deep. Lifting vine can control the growth of stems and leaves, at the same time, it can dry the ridge soil and improve soil permeability. However, the vine can not be turned during this period, because the vine is easy to damage the stems and leaves, disturb the uniform distribution of the leaves, affect the photosynthetic efficiency of the leaves, and reduce the yield.

Multiple spraying paclobutrazol for overgrown sweet potato fields, 50 kg of 15% paclobutrazol per mu was sprayed on 50 kg of water, generally 2 times, and the effect was better.

In the middle stage of sweet potato growth, we should pay attention to topdressing potassium fertilizer such as potassium sulfate, plant ash and so on. Because potash fertilizer can not only prolong leaf age, but also improve photosynthetic efficiency, promote the transport of photosynthetic matter, increase the ratio of potassium to nitrogen, and promote the rapid expansion of potato. 10 kg potassium sulfate per mu and 100-150 kg plant ash per mu.

The occurrence of sweet potato diamondback moth in some places has been serious in recent years, so attention should be paid to observation and timely control after discovery.