Measures for increasing production of Sweet Potato during expansion period

The root expansion period of sweet potato is the key period of yield formation. It is now August, and it is the root expansion period of sweet potatoes planted in spring and summer, and it is the period when the most fertilizer is needed. The following methods can be used to strengthen management, which can obviously increase production, generally increasing production by about 18% per 667 square meters, and the economic benefit is also remarkable.

First, spray foliar fertilizer. The plots with serious premature senility should mainly be sprayed with nitrogen fertilizer, on the contrary, the rational combination of nitrogen, phosphorus and potassium should be achieved. The amount of fertilizer applied can be determined according to the weather conditions at that time. Generally speaking, the amount of spraying can be less when there is no rain for a long time, and the spray should be made up in time in case of rain after spraying. Each time, the dosage is 30g / mu, 15kg of water is sprayed, and 7Mel is sprayed once every 10 days.

Second, hole topdressing. With a piece of wood, make a hole about 30 cm deep from its main root, put in an appropriate amount of three-element compound fertilizer, and seal it with wet soil. the effect will be better if you punch a hole on each side of the ridge.

Third, crack topdressing. When cracks appear in the expanded ground of sweet potatoes, use 500 grams of potassium dihydrogen phosphate per 667 square meters, add 400 kilograms of water, or 2.5 kilograms of urea and 10 kilograms of calcium superphosphate, add 500 kilograms of water, and fill cracks with fertilizer liquid, 0.7-1 kilograms per plant. Half a month later, every 667 square meters with 100 kg of grass ash plus 500 kg of water (soaking for 4 hours), the filtrate will be sewn and sealed.

Fourth, dry irrigation and waterlogging drainage. Autumn drought is often encountered in the expansion period of sweet potato, and the yield will be affected if it is not watered in time. In order to ensure the increase of yield, it can be irrigated 2 or 3 times in this period. In case of autumn waterlogging, it should be drained in time, so as not to cause soil hypoxia and affect root expansion.

Fifth, pinch the sharp and numerous branches. Removing all the tips of sweet potato seedlings when they survive can shorten vines, increase branches, increase green leaves, improve plant type, and facilitate more tubers. Note: do not turn the vine, do not "beat the rattan", only grow the rational vine to lift the vine, cut off the beard root, control the overgrowth.

Sixth, spray paclobutrazol many times. For overgrown sweet potato fields, 50 kg of paclobutrazol per mu was sprayed with 50 kg of paclobutrazol per mu, generally 2 times 3 times, and the effect was better.