Cultivation techniques of virus-free sweet potato

After detoxification, the sweet potato was cultivated early, with many branches, vigorous growth, multiple tubers, neat tubers, smooth skin, no cracks, pure skin color, and no black plaques. Generally, the yield can reach 4,000-5,000 kilograms per mu, which can reduce the amount of nitrogen fertilizer applied by 30%, and have strong resistance to black spot, black shank and other diseases of sweet potato. The main points of its cultivation techniques are described below:
1, apply base fertilizer. The base fertilizer should be dominated by organic fertilizers and phosphorus and potash fertilizers. Generally, less or no nitrogen fertilizer should be applied.
2, ridge planting. Because sweet potato is a short-day crop, the larger the temperature difference between day and night, the faster the tuber enlargement. Rigging can enlarge the ventilation and light transmission area, artificially create a temperature difference between day and night, and speed up the expansion of tuber roots.
3, increase the density. Moderate close planting is a guarantee of high yield of sweet potato. The detoxified sweet potato has the characteristics of neat growth, fast root swelling, and no empty plant, which is very favorable for increasing the density. The suitable density of sweet potato over 10,000 kilos per mu is 4500-5000/mu in spring and 5000-6000/mu in summer.
4, do a good job of chemical weeding. After the sweet potato pods are planted, they are sprayed with acetochlor (0.2-0.3 kg per mu) in a timely manner; or before the three true leaves of the weeds are sprayed and caught in a timely manner (with an acreage of 40-80 grams), generally the entire growth cycle can be avoided. Weeding again.
5, do a good job of control. Detoxification of sweet potato seedlings tends to flourish, and it is crucial to improve chemical production to increase production. In general, when the sweet potato pod grows to 45 centimeters, it can spray 200 milligrams per kilogram of paclobutrazol solution for 50 kilograms.
6. It is forbidden to turn vines. Turning vines with sweet potatoes is a labor-reducing measure that generally reduces production by more than 10%. The photosynthetic area after the vine was damaged, which reduced the accumulation of photosynthetic products and at the same time reduced the yield of underground roots.

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