High yield of sliced sweet potato for direct seeding

The cultivation of cut pieces and direct seeding of sweet potato is 20-30 days earlier than that of traditional planting. Due to the extension of its growth period, the yield of fresh potato per mu is increased by about 1000 kg. It is a comprehensive high-yield cultivation technique with low investment, high efficiency, labor and time saving.

First, prepare the land as soon as possible. The ditching depth of 30cm in winter or early spring can increase the ground temperature and water content, and use the low temperature in winter and spring to kill underground overwintering diseases and insect pests. Ridging is carried out according to the north-south line or according to the topography, the ridge distance is 60 cm, the ridge height is 20 cm, the ridge shape is tall and fat, and the ridge groove is deep and narrow, which is not only conducive to drainage and drought prevention, but also conducive to root block expansion. When raising the ridge, it is necessary to keep the ridge soil loose and the ridge surface pulled and raked flat. Apply sufficient base fertilizer, apply 4000-6000 kg organic fertilizer, 50 kg ammonium bicarbonate, 50 kg calcium superphosphate, 20 kg potassium sulfate or 100 kg plant ash per mu.

Second, select potato species. Select the excellent varieties suitable for local planting, the size of potato pieces should be uniform, and the potato pieces of 100g to 150g are better. Get rid of potato pieces that are damaged by freezing, diseases and insect pests. Generally use 50 kilograms per mu.

Third, cut into pieces and soak the seeds. According to the characteristics of dense buds at the upper end and sparse buds at the lower end of the potato block, the upper part of the potato block should be cut smaller, and the lower part of the potato block should be larger. Generally, each piece should retain 2-3 bud holes, and the cut potato mother should be soaked in 500-600-fold carbendazim solution for 10 minutes for 20 minutes. The solution temperature should be 5 ℃ higher than the temperature at that time, and it should be planted immediately after being taken out and dried.

Fourth, sow seeds in time. The time of slicing and direct seeding is one month earlier than the time of planting seedlings. After getting out of the cellar, the seed potato should be treated and sowed to the ground as soon as possible to avoid freezing injury. Before sowing, open a ditch on the back of the ridge with a width of 15 cm and a depth of 5 cm. After pouring enough water into the ditch, the mother bud eye face is placed in the ditch facing south, and the plant spacing is 25 cm 30 cm. Immediately after planting, it is covered with film to protect moisture and increase temperature, so as to promote germination.

Fifth, strengthen management. In the early stage, it is necessary to replenish the seedlings in time, the height of the seedlings is about 2 cm, and the membrane is broken artificially in time to avoid burning the seedlings. The film should be released in time when the ground temperature rises at the end of May and the beginning of June. In the middle and later period, we should pay attention to drainage and waterlogging, protect the stems and leaves, and not turn the seedlings. Topdressing should not be too much, you can carry out extra-root topdressing, spraying 1% urea or 0.5% potassium dihydrogen phosphate solution 50 kg per mu. At the same time, pay attention to weeding and insect control.