Pollution-free production technology of potato stevia and autumn cabbage in early spring

Rencheng District, Jining City, Shandong Province is the hometown of stevia rebaudiana in China. In recent years, we have vigorously promoted the pollution-free planting technology of early spring potato-stevia-autumn cabbage, which not only reduces the market risk brought by planting single crop stevia, but also greatly increases farmers 'income. The planting mode generally produces potato 1200~1300 kg, stevia 300~350 kg, cabbage 1600~1800 kg, output value 5000~5500 yuan and net income 3500~3800 yuan for 667 square meters. 1 production conditions pollution-free agricultural products production requirements within 2 kilometers around the pollution-free sources, farmland atmospheric environment quality, irrigation water quality and soil are in line with pollution-free agricultural products base standards. At the same time, the soil layer is deep and the organic matter content is high. 2 Variety selection early spring potato virus-free Luyin 8, Holland 15, Dongnong 303. Stevia rebaudiana varieties Huaxian 1,2 and 3 with large leaves, high yield, strong resistance and high sugar content were selected. Summer light is selected for autumn cabbage. 3 crop arrangement early spring potato sowing in late February, harvest in late May. Stevia rebaudiana seedlings in early April, mid-late May transplant. Autumn cabbage seedlings at the end of July and early August, transplanted 25 days later, harvested in October. 4 Planting specifications Early spring potato cultivation with ridge width and narrow rows, ridge spacing 1 meter, ridge top width 60 cm, ridge height 15 cm, a ridge double rows, wide rows 70 cm, narrow rows 30 cm, plant spacing 25~30 cm, 667 square meters planted 4200~4600 plants. Stevia rebaudiana is planted in large and small rows, with large row spacing of 40~45 cm, small row spacing of 30 cm, plant spacing of 10~12 cm, and planting 16,000 ~ 18,000 plants in 667 square meters. Autumn cabbage row spacing 40~45 cm, plant spacing 40 cm, 667 square meters planted 3500~4000 plants. 5 Field management 5.1 Early spring potato cut into pieces before sowing, warm seed, cut 40~50 pieces per kilogram, each piece at least has a healthy bud eye in the middle and upper part, warm seed for 15~20 days, bud germination can be transplanted to the field. Before transplanting, apply sufficient base fertilizer to the field, deeply plow 20~25 cm, ridge according to specifications, spray herbicide Duer after sowing, then film mulching, and water the seedlings after seeding. 15 kg urea is applied during the growth period, 15~20 days before harvest, and attention is paid to the prevention and control of pests and diseases during the growth period. 5.2 Stevia rebaudiana seedlings in small arch shed, the ratio of field to seedbed area is 15~20∶1, the width of seedbed is 1~1.2 meters. Before sowing, apply enough base fertilizer, 667 square meters of high-quality soil fertilizer more than 1 500 kg, 20 kg of diammonium or 50~60 kg of calcium phosphate, concentrated on the ridge surface, and then rake flat. Fine sowing, seed soaking 2~4 hours before sowing, mixed with fine sand soil evenly scattered on the seedbed, and then with plastic film wrapped in wood gently pressed, covered with fine sand, with seeds half-exposed half-buried is appropriate. 4~5 days before transplanting, remove the film and refine the seedlings. Apply more soil and miscellaneous fertilizer (decomposed chicken manure is better) to the field as much as possible. Apply more than 1500 kg soil and miscellaneous fertilizer to 667 square meters. 50 kg of sakofu (15:15:15)(30 kg of urea and 20~25 kg of diammonium can also be applied). After transplanting, check seedlings and supplement seedlings in time; cultivate 2~3 times before ridge sealing, and pick the top when the plants have 7~9 pairs of true leaves. Sprinkle after slow seedling can enrich 30 kg, kel20 kg; sprinkle before ridge sealing can enrich 30 kg. During the growth period, timely watering in case of drought and drainage in case of waterlogging. At the same time do a good job of pest control, after sealing the ridge timely pick the lower part of the old leaves of the plant. 5.3 Autumn cabbage seedlings are raised from the end of July to the beginning of August, transplanted in the field after 25 to 30 days, and then 2000 to 3000 kg of high quality fertilizer, 10 to 15 kg of urea and 20 kg of diammonium are applied to 667 square meters before transplanting, the transplanting row spacing is 40 to 45 cm, the plant spacing is 40 cm, 3500 to 4000 plants are planted in 667 square meters, watered after planting, watered in case of drought, and 20 to 30 kg of urea is applied to 667 square meters during the heading stage. In late October, according to market conditions and cabbage growth conditions, timely harvest and market.