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The sweet potato stems and leaves are long, which can cause the potato to become "burd root", which affects the yield. In order to inhibit the growth of sweet potato stems and leaves and promote the expansion of tubers, the following measures should be taken.
1. Topping: In the growing season of sweet potato, the top growth point of the vine is removed. Topping on the long vine variety and the field with a long trend can increase production. The topping was carried out twice. The first time when the sweet potato main vine grows to 30-33 cm, the 1-2 cm long head is removed, and the second time when the branch grows to about 30 cm, the branch is tender. tip. In this way, the branches are increased, the stems and leaves are flourishing, the photosynthesis is enhanced, and the distance between the roots, stems and leaves to transport nutrients is shortened, thereby promoting tuber enlargement.
2. Pruning: In July, the potato field with more branches and more growth can be cut off with 2-3 branches. Promote nutrient reflux, allow the potato to get more nutrients, improve the ventilation and light conditions between the branches, and increase photosynthesis.
3, do not turn over the vine: potato vine turnover not only changes the natural arrangement of the original leaves and affects photosynthesis, but also makes a large number of axillary buds sprout, and compete with nutrients, so it is not appropriate to turn over the vines, but for the overgrown fields Lifting vines, when the stems and leaves appear prosperous, lifted from the ground, and then placed in the original place, do not twist the stems and leaves, do not disturb the order of stems and leaves, do not break the stems and leaves. This can inhibit the generation of adventitious roots and stems and leaves of the stem section.
4. Spraying potassium: After the stems and leaves are closed, the plant is treated with 500 kg of potassium dihydrogen phosphate and 100 kg of water, and the leaves are sprayed with the fruit of the fruit, and sprayed once every 10 days, even spraying 2--3. Times. In this way, spraying potassium can promote the activity of the root formation layer and the synthesis and transport of carbohydrates, so that the stems and leaves can be thickened, thereby preventing the stems and leaves from growing, which is beneficial to the expansion of the potato pieces.
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