Potato tuber enlargement and starch precipitation period in the middle and late stage of potato cultivation are the key periods for water requirement and fertilizer demand. The management in the later period can not be ignored, which will directly affect the stable yield and high yield of the potato. The main management measures are:
1. Timely weed out the weeds between the ridges and cultivate the earth twice in the potato roots. Potato production can be increased by soil cultivation to prevent the occurrence of potato tuber scab.
2. Water and fertilizer in time. Potato tuber enlargement requires sufficient water and fertilizer supply. When the tuber size of the walnut can be combined with water to topdressing, potato is a potassium-like crop, the demand for potash fertilizer is greater. When watering, Mu topped 20 kg of nitrogen and potassium fertilizers, and then top-dressed it once every 10 days, continuously topdressing twice. When encountering continuous dry weather, it is necessary to pay attention to watering in time to prevent soil drought from affecting tuber enlargement.
3. Controlling and preventing leggy. Observed at the right time, there is no growth before the phenomenon, if there is a long, you can spray 15% paclobutrazol 50 to 80 grams, 50 to 60 kilograms of water evenly spray regulation, in the tuber enlargement period, spraying potatoes, large expansive tablets, is conducive to tubers Expansion, increase production.
4 timely control of pests and diseases. (1) Late blight. Each use of 64% anti-tussive WP 120 grams, or 72% WP WP, or 58% metalaxyl MnZn wettable powder, etc., 50 to 60 kg of water evenly spray. (2) Insect pests. When pests are found, 25 grams of 5% anti-inflamy WP, 10 to 20 grams of 10% imidacloprid wettable powder, 50 to 70 kilograms of water, and spraying are used alternately. Also can control aphids, whitefly and other pests. At the same time, adding 0.3% potassium dihydrogen phosphate solution to foliar spray can effectively prevent premature potato decay, promote tuber enlargement, and increase yield.
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