Potato planting enters the tuber expansion and starch precipitation period in the middle and late periods, which is the key period for water and fertilizer. The management of the latter period cannot be ignored, which directly affects the stable and high yield of potatoes. The main management measures are:

1. Pull out the weeds in the ridge in time and cultivate the soil twice at the root of the potato. Soil cultivation can increase potato yield and prevent the occurrence of potato tuber green skin disease.

2. Water and fertilize in time. The expansion of potato tubers requires sufficient water and fertilizer supply. When the tubers are the size of walnuts, they can be combined with watering and top dressing. Potatoes are potassium-like crops, and the demand for potassium fertilizer is large. When watering, apply 20 kilograms of nitrogen and potassium fertilizer on the mu, topdressing once every 10 days, and topdressing twice in succession. When encountering continuous dry weather, pay attention to timely watering to prevent the soil drought from affecting tuber expansion.

3. Chemical control and prevention. Observe in time to see if there is a long phenomenon before flowering. If there is a long time, spray 50% to 80 grams of 15% paclobutrazol. Evenly spray the water with 50 to 60 kg to regulate and control. Spray the potato expander on the foliage of the tuber expansion stage, which is helpful for tuber Swell, increase production.

4. Prevent diseases and insect pests in time. (1) Late blight. Each mu selects 120 grams of 64% antitoxin alum wettable powder, or 72% glu wettable powder, or 58% metalaxyl manganese zinc wettable powder, etc., evenly spraying 50-60 kg of water. (2) Pests. When pests are found, use 25 grams of 5% aphid-resistant wettable powder per acre, or 10-20 grams of 10% imidacloprid wettable powder, 50-70 kg of water, spray control, alternate use. It can also control pests such as aphids and whiteflies. At the same time, add 0.3% potassium dihydrogen phosphate solution for foliar spray, which can effectively prevent the premature aging of potatoes, promote tuber expansion, and increase yield.

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