The method of early spring ripening of potato has three ways: mulching small arch shed double film covering, thick film small arch shed covering and mulching film tiling. Potatoes cultivated in these ways can be marketed 10 to 20 days earlier than conventionally cultivated potatoes.
Regardless of the type of coverage used, it is necessary to use Dongnong 303 or Kexin No. 4 original species transferred from the northeast. It is not allowed to use self-retained seeds, and it is not allowed to use seeds that have been kept for many years, and the varieties are aging and the species are seriously degraded. Kind. The amount of ar is about 150 kg. The big potato can be cut and planted, each seed potato weighs 20 grams to 25 grams, and the bud eye 2 to 3 pieces.
Applying the base fertilizer is inconvenient for top dressing after film mulching, and the fertilizer should be applied once before the film is applied. When ploughing, the acre is supplied with 50 kg of sulfur-containing ternary compound fertilizer (15% of nitrogen, phosphorus and potassium). After the whole land is done, the farmer's organic fertilizer, such as livestock and poultry fat or human urine fertilizer, is more than 30. The hole should be deeper and larger. First use human feces and urine, then apply a manure and manure, and then cover a layer of soil to avoid direct contact between seed potatoes and fertilizers, affecting emergence. The remaining fertilizer can be applied in the ditch between the rows, and then covered with soil, so that it can be continuously supplied with fertilizer, and it is not necessary to topdress later.
Chemical weeding should be carried out before the cover film is covered with chemical weeding to prevent grass damage. The whole field is sprayed with 50% to 100 ml of 50% acetochlor. When applying the medicine, the soil is required to be moist, and the surface of the sky is flat to improve the herbicidal effect.
Cover the film nylon film to be carefully covered, surrounded by soil compaction, to ensure that the seal does not leak before emergence. After the emergence of the seedlings, the mulch film should be broken in time to release the seedlings, and the seedling holes should be sealed with the soil to increase the soil temperature. Covered with arch sheds, ventilation should be ventilated in case of high temperature on sunny days to prevent high temperature burning.
Chemically regulate the initial flowering period of the potato to the full bloom period, using 30 ml of uniconazole to 48 kg of water, and spraying evenly on the plant can enhance the resistance of the plant, reduce the disease, prevent the growth, early maturity and increase the yield. Generally, the yield can be increased by 10% to 15%.
The disease during the growth of disease-preserving and controlling insects is mainly late blight. When sporadic disease plants are found, they should be removed in time, and then the whole field is treated with 25% sulphur 800 times spray; the insect pests are mainly 28-star ladybugs and aphids. The 28-star ladybug can be sprayed with 80% dichlorvos 500 times, and the aphids can be sprayed with 10% imidacloprid 2000 times.
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