Potato sprout-breaking rapid propagation method

Site selection: any place used for sprouting or transplanting must be a plot where potatoes have not been grown for more than 3 years. Sprouting: tuber selection: carefully select the pre-elite seed potatoes or elite seed potatoes harvested the previous year, choose tubers weighing about 100 grams, uniform in size, and remove any deformed, misshapen tubers and diseased tubers. Sprout promotion: spread the selected tubers on the ground in a nylon mesh shed, promote sprouting and sun the seed potatoes for 10-15 days; when the surface of the seed potatoes becomes soft and the apical buds grow to the size of soybean grains, plant the tubers for sprouting. Making the sprouting bed: the bed is 1 m wide, 2.5 m long, and 0.3 m deep. Choose fresh donkey and horse manure, sift it repeatedly until fine and crumbly, then spread it into the bed to a thickness of 0.2 m, tread it firm and water it thoroughly; water to the extent that when you step on the surface of the manure, water squeezes out around your foot. Promptly cover with a small plastic arch tunnel, cover tightly and seal with plastic film, and let it fully decompose in the shed at 25-35°C for about one week. Planting tubers: first spread a 3 cm thick layer of fine moist soil on the surface of the bed, then place the selected and sprout-promoted seed potatoes into the bed, with the tuber navel facing down and the top facing up, placed at a slant from north to south, with about 4 cm between tubers; then sprinkle fine sand and fertilized soil 3 cm thick over the surface of the seed potatoes and scrape the top level. If the surface soil layer becomes dry, spray lightly as appropriate to keep the surface soil moist, then cover well with plastic film to keep warm and promote sprouting. On May 23, plant the tubers for sprouting; on June 10, carry out the first sprout breaking; the first sprouting period is 18 days, and the second sprouting period is 12 days. Transplanting: making the bed: level and make beds in the nylon mesh shed, with a bed width of 1 m, apply sufficient base fertilizer, applying 3000 kg of high-quality barnyard manure and 40 kg of ammonium nitrate per mu, plowed in at one time. Sprout-breaking transplanting: when the sprouts of the seed potatoes in the sprouting bed grow to 3-4.5 cm and are thick and strong, and the roots are about 9 cm long and carry a large number of fibrous roots, they can be transplanted.