In the middle and late stages of sweet potato, focus on this "three defenses"
Anti-harm
Most areas are rainy, the stems and leaves of sweet potato plants grow rapidly, and the nutrients do not go upwards. At this time, attention should be paid to drainage, that is, the water in the area should be quickly removed after the rain, and the upper part of the ground should be controlled to make the potato pieces not wet. The soil is rapidly expanding.
Defense chief
In the hot and rainy season, the soil moisture is too large, and some sweet potato varieties are rooted too much, especially in the high-fertilizer plot, the sweet potato white roots are much deeper and deeper. It can control the stems and leaves, and can dry the ridges and improve soil permeability. However, during this period, it is impossible to turn over the vines, because the vines are easy to damage the stems and leaves, disturbing the even distribution of the leaves, affecting the photosynthesis efficiency of the leaves, resulting in reduced yield. It is also possible to spray paclobutrazol several times. For the long sweet potato field, 15% paclobutrazol 50-70 g per acre is sprayed on 50 kg of water, and generally sprayed 3 times, the effect is better.
Premature aging
In the middle and late stages of sweet potato growth, attention should be paid to foliar fertilizer such as potassium dihydrogen phosphate. 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 chips. 100 grams of potassium dihydrogen phosphate, 50 kg of foliar spray with water, 3 times a week.
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