Early autumn potato is a better autumn crop, short growth period, good food and vegetables, but it also has high yield barriers, mainly in the following: the sowing season coincides with the autumn rain season, after the high temperature, high temperature and humidity can easily lead to the lack of bad potatoes Seedlings, in addition to other years, the late blight harm is more serious. Therefore, in order to obtain high yields of autumn potatoes, cultivation should be based on the production characteristics of early autumn potatoes, and do a good job in all aspects of technology.

Potato selection and selection. The seeds of potatoes in early autumn should be selected from the small potatoes in spring potatoes. Seed potatoes are stored in low-temperature, ventilated areas in order to ease the degradation and ensure that the seedlings are neat and tidy in autumn. Potatoes in early fall must use early-maturing varieties with strong resistance to stress, high temperature and drought resistance, short dormancy period, early potato growth, and resistance to decay, such as Dongnong 303, Feiwuruitin, Zhongshu No.4 and Luyin No.1. Buster 4 and so on.

Cut the potatoes and handle them. Cut seed potatoes to use sterile, pollution-free knife, cut the best hot water boiled before washing it again. Cut the potato from the top of the seed potato and cut it vertically to break the top bud. Then keep 1-2 buds according to the distribution of the buds. The potato weighs 25-30 grams. In order to avoid knife-to-mouth disease, it must be cut and used fresh for 3 days before sowing. Clean grass ash protects the incision.

Soaking and germination. Seed germination can promote early dormancy, promote germination, so that the emergence of seedling after sowing, increase production. Potatoes must be germinated in autumn. 30 days before sowing, the tubers were soaked in a solution of 85% gibberellin, 1 gram of water and 100 kg of water for 15 minutes, and then germinated with wet sand. After germination, the seed potatoes were budded at room temperature for 10-15 days to ensure the whole. seedling.

Soil preparation and fertilization. The cultivation of potatoes is preferably done in the loose sand loam of the upper-middle fertility. In order to meet the potato's requirements for soil nutrients in early autumn, it is beneficial to the enlargement of tubers. After harvesting the former crops, the soil should be ploughed more than 20 cm deep, and carefully plowed twice to make the ground flat and clear. At the same time, in combination with site preparation, basal fertilizer should be applied. Generally, 1500 kg of pig manure per acre, 50 kg of 45% potassium sulfate compound fertilizer or 50 kg of special compound fertilizer should be applied. After the above fertilizer is fully mixed, the ditch will be applied and the soil will be covered. .

Sowing and dense planting. Early sowing of potatoes should be after the beginning of autumn. Seeding is too early, the seedlings are too long and the temperature is too long; the sowing is too late, the growth period is shortened by the limitation of the frost period, and the yield is low. The local climate should strive for early sowing. Early autumn potato growth period is relatively short, the yield per plant is relatively low, should be appropriate close planting, generally 5500-6000 points per acre, with the amount of 160-180 kilograms, width of narrow lines, row spacing 40 cm x 25 cm. After sowing, it is necessary to cover straw or grass to moisturize, prevent rain, and cool down on the surface of the car to ensure the emergence of seedlings as soon as possible.

Intertillage and top dressing. After the emergence of timely cultivator, combined with cultivator, suitable for nitrogen fertilizer, generally apply 5 kg of urea per acre. Leaf age 6-7 leaf stage, see the seedlings apply a good top dressing, so that when the drought is filled with horse racing water, rain and waterlogging. When the early autumn sowing potato seedlings are about 15 cm high, they should be combined with cultivator and moderately cultivated. Especially after heavy rain, drainage, soil loosening and earth-cultivation should be promptly conducted to increase soil permeability and reduce the phenomenon of potato exposure.

Disease prevention and pest control. Potatoes are generally less susceptible to pests and diseases, and underground pests need to be controlled before they are sown, and 48% of L. or Splendor 1000 times can be sprayed. After sowing with cover soil, use 90% Na Nase 50-60 grams per acre to evenly spray 100 kilograms of water to control weeds. For each stage of growth, if it is found to be harmful to locusts, 10 imidacloprid wettable powders (1500 times) can be used and the entire plant can be evenly sprayed. For late blight 72% Kelu 700-800 times the liquid can be used to prevent and treat.

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