Summer sweet potato refers to the sweet potato planted after the harvest. Its fertility period is short, only about 120 days. Therefore, strengthening management of cultivation techniques is the key to determining production.
Variety selection and cutting: Select early-maturing high-quality varieties such as Beijing 553, Red Heart King, and Shanchuan Purple. The potato seedlings of the summer potato are mainly cut from the seedlings of the spring potato. When cutting the seedlings, the seedlings are required to be 20-30 cm long, have 6-8 nodes, and have apical buds, because they have the apical dominance, strong growth potential, and therefore slow The seedlings are fast, extend the vines early, and the potatoes are fast.
Soil ridging and base fertilizer application: After grading with a special ridge rig, the ridge length is 70-75 centimeters, and the ridge height is 25 centimeters. The sweet potato ridge should be flat and straight, with no apparent slag. Under normal circumstances, 2000-3000 kg of high-quality organic fertilizer and 40-50 kg of 30% sweet potato fertilizer should be applied per acre. Fertilizer is applied on one side of the potato ridge, and this method can save fertilizers when applied to the surface before preparation.
Planting: In the top of the potato ridge, dig a deep, 5-6 cm, 8-10 cm diameter soil pit, horizontally insert the potato seedlings into the earth pit, and pour in enough water to cover the soil immediately after seepage. All the leaves are buried in the soil so that the water in the leaves can be returned to the stalks of the seedlings to promote seedlings. Check the seedlings and fill the seedlings at 2-3 days to ensure 4000-5000 acres per mu. After planting, 0.2-0.3 kg of acetochlor and 100 kg of water are used in the mu and evenly sprayed in the furrows for chemical weeding. In the middle and late growth stage, the middle cultivator is used, and then the clear grass is removed.
Pruning twigs and smashing: Entering the rainy season on the potato easily breeds adventitious roots and disperses nutrients. Potato farmers are used to turning over vines. This will reduce the photosynthetic efficiency and generally reduce production by 1-2%. Putting the vines back and putting them back in place will not cause such consequences. When the yam grows to 12 knots, it is topping to promote lateral branching. Lateral branches reach a maximum of 12 knots to accelerate the growth of yam.
Foliar spray fertilizer: sweet potato growth into the middle and late, if the seedling growth is weak, yellow leaves, you can use 0.2% potassium dihydrogen phosphate and 0.5% urea mixed solution spraying, spray every 7-10 days, Even spray 2-3 times to prevent premature failure and increase production.
Timely harvest: When the temperature drops to 15-20 degrees Celsius, and the ground temperature is below 5 degrees Celsius and 16 degrees Celsius, the harvest will be timely when the tubers stop expanding. Pay attention to not damage the epidermis at the time of harvesting and store in graded packing.
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