1. Cut the root of the vine

Generally speaking, the growing season of sweet potatoes is mostly in summer, when it is often hot and rainy. If the soil moisture is too high for a long time, it will encourage the white roots to grow more and deeper, which is not conducive to the expansion and development of potato pieces. At this time, the method of "lifting vines and cutting roots" can reduce the water and nutrients delivered to the stems and leaves. On the one hand, more nutrients can be used to ensure the expansion of underground potato chunks. On the other hand, it can effectively control the appearance of the stems and leaves. It helps to dry the ridge soil and improve the permeability of the soil.

Two points should be paid attention to when cutting the root of the vine. One is to cut the root of the vine instead of turning the vine. That is to say, the vine is gently lifted up, the adventitious roots that grow from the vine nodules are uprooted, and then the vines are dropped as much as possible without changing the original stem and leaf orientation to ensure the photosynthesis efficiency of the stems and leaves. The second is that it is not suitable to cut the roots of vines in hot and dry areas. Because vine root cutting is mainly to prevent excessive fertilizer and water and excessive growth, the summer drought area itself has less rain, and it is not prone to excessive growth. The vine root cutting reduces the root system of the vine, which is not conducive to root water absorption and affects the yield of sweet potatoes.

2. Pursue potato fertilizer

Pay more attention to top dressing in time. Topdressing in this growth stage generally requires potassium fertilizer, such as potassium sulfate and plant ash, to extend the growth cycle of the stems and leaves on the ground, avoid premature senescence of the ground vines, and ensure the organic matter produced by photosynthesis for the expansion of the potato mass. This in turn promotes normal expansion of the potato pieces. Generally speaking, 10-15 kilograms of potassium sulfate can be flushed with water per acre, or 100-150 kilograms of plant ash can be sprayed. At the same time, don't forget to spray 0.3%-0.4% potassium dihydrogen phosphate solution + 0.1% borax solution 2-3 times on the foliage.

In addition, if the above-ground stems and leaves are elongated due to excessive fertilizer and water (the upper leaves are black, the leaf node petiole is longer, the leaf layer is thick, the leaves are severely blocked, etc.), it is recommended to use 50-70 grams of 15% paclobutrazol powder per acre in time. Spray 2-3 times with 50 kg of clean water, which effectively promotes the normal growth of stems and leaves.

3. Drought prevention and drainage

Most of the sweet potato growth period is in the summer flood season. Frequent rain can promote the rapid growth of the stems and leaves, so that a large amount of nutrients are transported to the stems and leaves above the ground, and the nutrients for the expansion and development of underground tubers are difficult to fully guarantee. Of course, the opposite is true for the summer and drought areas where there is less rainfall. A lot of water is needed to protect the potato chunks from swelling, but at this time there is a shortage of water.

Therefore, it is necessary to strengthen drought prevention and drainage in the mid-growth period. That is to say, in rainy areas, the field should be drained in time to avoid long-term accumulation of water in the field, which is not conducive to the expansion of potato chunks; in dry and rainless areas, water should be timely irrigation to avoid water shortage affecting the growth of stems and leaves and potato chunks.

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