Purple black potato cultivation

1. Pregermination and cutting: 20-30 days before sowing, the selected seed potatoes are placed under 20°C ambient conditions, sprayed with water and covered with grasshoppers. When the young shoots grow to the size of the soybeans, the seed potatoes will be placed in a warm and sunny place and the seedlings will be green and vigorous. Seed cuttings are made 1-2 days before sowing. The weight of each seed potato is about 25 grams. A small piece of seed potato is cut vertically, and each cut must have a top bud; the large seed potato is cut open from the tail, and the weak shoots are eliminated. The buds are arranged in order, cut obliquely from the top, and finally the top is divided into two. The knife must be strictly disinfected with 75% alcohol.

2. Site preparation: purple and black potatoes have a short growth period and require more concentrated fertilization. Each sub-acre is spread with 3-5 cubic meters of high-quality organic fertilizer, 20 kg of diammonium phosphate, 20 kg of urea and 10 kg of potassium sulfate. The soil will be fertilized. Deep plowing. The purple-black potatoes should not be dense and should be ditched at a distance of 70 cm, with a ditch depth of 5 cm. The phoxim granules should be applied to prevent underground pests such as tigers in the ditch. Seedlings were planted at a plant spacing of 25-30 cm. About 3,500 plants were maintained per acre. Immediately after sowing, the ridges were repressed and well-formed, and the mulching film was sprayed with the herbicide.

3. Field management: After the seedlings are unearthed, the seedlings must be broken and the seedlings should be sealed in the wet soil. When the seedlings are flushed, in order to promote the early emergence of seedlings, foliar spray may be sprayed with chlorophyll 800 times for 2-3 times; during the flowering period, the buds are removed timely. In order to increase the rate of large potatoes, sweet orange fruit can be sprayed on the leaves for 2-3 times. The main disease of purple-black potatoes is late blight, and insect pests are aphids and ladybugs. The control of late blight can be sprayed with 64% of the antivirus 600 times; control of aphids and ladybugs can be sprayed with 18% of Lethburn 1000 times.

4, timely harvest: According to the market supply and marketing situation timely harvest, harvesting process to minimize mechanical damage, so as not to affect the quality of goods.

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