Focus on the "Three Preventions" of Sweet Potatoes
Waterlogging prevention
In September, the above-ground stems and leaves of sweet potato grow rapidly, and the nutrients are upwards and not downwards. At this time, attention should be paid to drainage, that is, promptly drain the ground water after the rain, and control the growth of the upper ground, so that the potato pieces can be in the soil that is not wet or dry. Expand quickly.
Anti-legal
In the hot and rainy season, the soil moisture is too high, and some sweet potato varieties take too much root, especially in high-fertility land, where the white roots of sweet potato are much deeper. The vine can control the length of the stems and leaves, and can also dry the ridge soil to improve the permeability of the soil. However, during this period, the vines cannot be turned, because turning vines can easily damage the stems and leaves, disturb the uniform distribution of the leaves, affect the photosynthetic efficiency of the leaves, and reduce the yield. It is also possible to spray paclobutrazol several times. For leggy sweet potato fields, use 15% paclobutrazol 50 to 70 grams per mu with 50 kg of water to spray, generally spraying 3 times, the effect is better.
Prevent premature aging
Pay attention to applying foliar fertilizers such as potassium dihydrogen phosphate in the middle and late stages of sweet potato growth. Because potassium fertilizer can not only prolong leaf age, but also improve photosynthetic efficiency, promote the operation of photosynthetic substances, and promote the rapid expansion of potato pieces. In early September, 100 grams of potassium dihydrogen phosphate per mu was mixed with 50 kilograms of water for foliar spray, once a week, 3 times in total.
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