A brief discussion on the key points of High-yield cultivation of Film-mulched Sweet Potato

First, select suitable plots to increase fertilizer. It is best to choose fertile and irrigated loam to plant sweet potatoes. The ploughing layer of the land covered with plastic film should be deepened, the depth of ploughing in autumn is about 25 cm, and more than 2500 kg of high-quality mature farm manure are applied per mu, and when ploughing and ploughing, 2 to 3 agricultural fertilizers and 1 to 3 ridges, 20 kg of potassium sulfate compound fertilizer (15% of N, P2O5, K2O) and 10 kg of potassium sulfate are applied to each mu.

Second, ridging specifications and film mulching technology. Ridging according to 50 cm wide ridge distance before and after May 1, to flatten the ridge surface so as not to break the film, it is best to buckle the film after rain; if there are weeds with herbicide 50% Acetochlor EC 0.1 kg per mu, evenly spray 70 kg water, and immediately cover the film after spraying through. The width of the film is 120 cm, two ridges are buckled at a time, and the film is 6 kg per mu. When buckling the film, the film should be tightened, and the soil should be firmly covered. Press a strip of soil across the film every 2 meters, waiting for seedlings to be planted.

Third, planting seedlings: sweet potato varieties cultivated with plastic film mulching should choose 868 series which are more popular in the market, such as Yifeng and so on. Seedlings are usually planted on May 8-15 after raising seedlings. Under the premise of ensuring that you will not be harmed by cold, the earlier the planting date, the better. Choose sunny and windless weather, plant on the ridge with a row spacing of 50cm according to the plant spacing of 30cm, with a hole opener of 3.3cm in diameter, generally plant seedlings at a depth of about 6cm and protect 4200 seedlings per mu. After planting, the aboveground part of the seedling leaves 3 leaves and the outcrop is about 3 cm. First irrigate the foot nest water, plant the seedlings immediately, and seal the strict nest hole after the water seeps down. If it is too dry, it can be irrigated along the ridge and furrow after planting.

Fourth, field management: film-mulched sweet potato has a better anti-waterlogging effect, such as special drought can be irrigated along the ridge under the film. Rain Water should drain water in time when there are many times. It is forbidden to turn the vine during the whole growing period of sweet potato, generally there is no need for topdressing, and diseases and insect pests rarely occur. In the middle stage of growth, 50 kg of 0.2% potassium dihydrogen phosphate solution per mu can be sprayed according to the appearance of the plant, preferably in the evening, once every 6-7 days, 3-4 times in succession.

Harvest: film-covered sweet potatoes are generally harvested around October 1 and listed immediately after harvest.