Four key points of field management of sweet potato

One is to fertilize and raise seedlings. During ploughing 7-10 days after planting, 20-30 piculs of human and animal manure water to 10-15 kg ammonium bicarbonate or 5 kg urea (preferably with 40% high-efficiency compound fertilizer 7-10 kg) were irrigated into the pond; at the same time, 100-150 kg of plant ash mixed with 25-30 kg calcium superphosphate per mu was applied to the pond, not in the pond (only human and animal manure water was used to lift seedlings with high-efficiency compound fertilizer) When rattan leaves seal ridges, 21.8% zinc sulfate 0.5 kg or compound zinc fertilizer 0.8 kg per mu is sprayed on 50 kg of water; in the first ten days of October, 100 grams of potassium dihydrogen phosphate and 150 grams of urea are used per mu, and 50 kg of water is sprayed 2-3 times.

The second is to 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.

Third, drainage and waterlogging prevention. It is necessary to clear the ditch and remove silt at any time, repair the ridge surface, and ensure that there is no stagnant water in the ridge and furrow.

Fourth, timely harvest. In the first and middle of November, sweet potatoes were dug up, used as seed, edible or forage, vine tips as vegetables and rattan leaves silage as feed. Note: harvesting early and too late will reduce yield, quality and storability. As a fresh potato on the market, it can be harvested in advance.