At present, tubers are used as seeding materials in production. First, disease-free, smooth-skinned and thin-skinned, potato-shaped, and clear-spotted potato pods should be selected for seeding. The storage is improper or the storage time is long and weak. The potato chips or the slender, fragile potato chips are weak in viability and are susceptible to disease. They cannot be used as seed potatoes. Otherwise, it will seriously affect the output. Generally, the production of large seed potatoes is higher than that of small seed potatoes. However, large seed potatoes are used for seeding, and the seed amount is large and the cost is high. Therefore, middle-sized potato blocks are generally used as seed potatoes in production, and each seed potato is generally used. About 50 grams is appropriate. The use of non-dividing whole potato sowing has the advantages of preventing disease and keeping seedlings, preventing droughts, preventing floods, avoiding the spread of diseases and insects through cuttings, saving labor, neat planting, well-developed root systems, and strong growth potential. In particular, sowing the whole potatoes in autumn has a significant effect on the reduction of seedlings. Seed cuttings can save seed use and early germination. Generally each cut weight should not be less than 20 grams, there should be 1-2 buds on it, when the seed potato cuts, in order to prevent ring rot and bacterial wilt infection by the cutter, the cutter should be strictly disinfected, available Two blades cut edge and turn the knife in boiling water for 5 minutes to disinfect, or disinfect with 75% alcohol. Seed potatoes should be placed in a cool, well-ventilated area and then air-dried before planting. In order to promote early germination, the incision should be close to the eye of the bud, and the incision can also be smeared with some ash. When introduced from other places, seed potatoes should be disinfected before sowing in order to prevent infection of seed potatoes (scar, black shank, and black shank). Usually soaked in 0.5% formalin solution for 20-30 minutes, remove and boring for 6-8 hours after immersion, and then cut and sow. As potato tuber matures into a dormant period, in the early spring when the winter sowing of autumn tubers used as seed potato or autumn sowing of spring and summer harvested tubers for seed sowing, stem dormancy is often not easy to germinate. Therefore, it is necessary to carry out the treatment to break the dormancy and promote germination. Common methods include: 1 Cutting method: The cuttings of seed potatoes promote oxygen into the interior of the tuber, increase the oxygen absorption rate, and promote the activities of various enzymes. This method is applicable to seed potatoes that have a short dormancy period, weak dormancy intensity, and a long shelf life. 2 Pharmacy treatment method: Soak seeds with 0.510-6—110-6 gibberellic acid for 5-10 minutes, or soak the whole potato with 0.510-5—1.510-5 gibberellin for 1 hour. This method is suitable for dormancy. Seed potatoes with longer or stronger dormancy intensity. 3 sun seed germination method: the seed potatoes spread out in the sun drying, even the sun for 3-5 days, the potato block becomes soft and then heap up and stuffy. Then the sun and then heap stuffy, usually after 15-20 days. The skin of the seed potato becomes blue, the potato becomes soft, and when the buds have white spots or grow short green and strong buds, they can be sown. China Agricultural Network Editor
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