Second, strengthen fertilizer management
This year, Jianchuan had a relatively dry climate in the early stage. It should be watered once during the bud period. During the flowering period and the final flowering period, a small amount of watering should be carried out depending on the weather. If the rainfall is large in the later period, it is necessary to pay attention to drainage and prevent water accumulation. Combine each cultivating and cultivating soil, carry out topdressing, apply 5 kg of urea per acre, and 5 to 10 kg of potassium sulphate to prevent premature senescence of the plants and promote potato formation. In the expansion period of potato tubers, 5~10kg of 0.2% potassium dihydrogen phosphate solution can be sprayed per acre. When the aboveground part of the plant appears to be long, spray chlormequat or paclobutrazol 1~2 times to control the plant height below 60cm.
Third, pest control
Potato pests and diseases are early blight, late blight and leaf miner. The monitoring of pests and diseases should be strengthened. It is found that the central disease plants should be removed in time, and the field destruction should be carried out to remove the dead lower leaves; timely drug control: early blight, 58% of late blight Metalaxyl manganese zinc 1000 times, or 64% anti-virus hydrating powder 500 times liquid, or 25% leaf dry spirit 250 ~ 400 times liquid, 7 to 10 days, continuous control 2 to 3 times. The leaf miner is controlled with 25% plaque emulsifiable concentrate 1500 times solution or 48% chlorpyrifos 1500 times solution or 98 battan original powder 1500 times solution or 1.8% edpredin emulsifiable concentrate 3000 times solution.
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