Seed retention technique of potato in autumn

1. Fine soil preparation for autumn potato should choose fields with high topography, convenient drainage and irrigation and fertile soil, and loam soil is better.

two。 Seed potato sprouting in mid-August, the harvested spring potato was picked out diseased potato, split potato, irregular potato, and cut into pieces according to the seed potato bud eye. Each seed potato was longitudinally cut into 6 pieces and mixed with 0.1 grams of gibberellin and 100 kilograms of water. Soak the potato pieces for 10ml for 20 minutes, take them out and dry them, then sprout with wet sand layer. Do not sprinkle water during the budding period, and the budding temperature should be kept above 30 ℃. Under the conditions of low temperature, ventilation and humidity, when the buds grow about 3 cm in 8 days, take the potato pieces out of the sand and dry the seedlings in the shade for 1 day.

3. When sowing at the right time and applying sufficient basic fertilizer for remaining seeds in autumn, the potato should avoid sowing in the high temperature season, so as to ensure the smooth emergence of potato seedlings and avoid the high temperature season, so as to reduce the degradation of seed potato and maintain its seed character. Sow seeds when the temperature drops in late August. When sowing, 3000 kg of high-quality farm manure, 15 kg of urea and 20 kg of potassium sulfate were applied into the sowing ditch with seed potatoes, and then planted all kinds of potatoes.

4. Reasonable close planting and autumn sowing potato should appropriately increase the density than spring sowing potato. When sowing, shallow trenches should be opened according to row spacing of 50cm and plant spacing of 20cm. The seed consumption is about 120kg per 667m2, sowing 7000 plants. After planting, the soil is 10 cm thick, forming a natural ridge.

5. Field management in early September, after seed potato seedlings, it is necessary to strengthen water and fertilizer management to ensure that potato seedlings have sufficient fertilizer and water. The temperature of autumn sowing potato is higher in seedling stage, so pay attention to drought prevention and drainage. Watering in time in case of drought to keep the field moist and furrow dry, so that potato seedlings grow early and quickly, form sufficient photosynthetic area and promote the formation of tubers. After each watering, the soil should be cultivated according to the situation. Potatoes are generally cultivated for 3 times during the growing period.

6. Control of diseases and insect pests autumn sowing potato is prone to late blight and autumn aphids. If it is found that the infected plant of late blight should be pulled out in time, it should be taken out of the field and burned. You can use 65% mancozeb 100 grams or 40% ethyl phosphorus aluminum 150 grams per 667 square meters, evenly spray 30 kilograms of water, spray once every 10 days, and spray 2 colors 3 times in a row. 40% omethoate can be used to control aphids with 100 grams of omethoate per 667 square meters or 50 grams of 25% dimethoate, and 50 kg of water can be evenly sprayed to control aphids.

7. At the end of October, when the leaves of the middle and lower parts of the plant begin to turn yellow, the potato can be harvested and stored at the end of October.