First, prevent stems and leaves from growing. The season of summer sweet potato is in the season of high temperature and rain, and the growth of stems and leaves is fast. If it is not controlled in time, it will easily cause prolongation. Generally, when sweet potato glutinous rice grows to 50-60 cm, it will spray 10 ml per 667 square meters, or 20-25 ml. For the lack of fertilizer seedlings, 10 kg of urea per 667 square meters or 20 kilograms of diammonium phosphate, 1000 kilograms of manure excrement in the rot, by opening a hole next to the ridge back. After fertilization, the water is poured, and the water is oozing down to cover the soil. Second, protect the stems and leaves without turning. Sweet potato turf is damaged due to stems and leaves, reducing photosynthesis, producing less nutrients, resulting in reduced production. At the same time, turning over the stalks will cause the leaves to overlap and intensively, which will damage the tops of the stalks and cause new shoots and lobes to be produced, resulting in a reduction in yield. Up to 20% to 30%. Third, timely prevention of pests and diseases. In recent years, the sweet potato hawk moth is heavier. Once it is found, it should be sprayed with 4.5% beta-cypermethrin EC 3000 times or 20% methrin 2000 times to ensure that the sweet potato has enough leaf area and grow at the same time. During the period, we must promptly control the mites to prevent the introduction of the virus. Custom Length Pvc Tube,Customized Length Sheath,Length Pvc Pe Tubes,Environmental Protection Pe Tubes Jinan Mucho Commercial Inc. , https://www.muchovet.com