Chemical regulation When the yam is close to the ridge, spraying 15% paclobutrazol 15% per acre on 15 kg of water to prevent foliar growth. In the middle and late stages of sweet potato growth, chemical regulation is carried out. Each mu should be filled with 25 ml of multi-functional biological agents, 15% of paclobutrazol 20-40 g, and 50-80 g of potassium dihydrogen phosphate plus a spray bucket of water. Insect pests can be added to pyrethroids or organophosphorus pesticides. Spraying is best done after 4:00 pm. The amount of paclobutrazol should be used flexibly according to the weather and sweet potato growth. The weather is dry and the sweet potato grows weaker and weaker. On the contrary, it should be used more. In time to mention vines, topping topping Now the sweet potato cultivars advocate "raising" rather than "turning over", and generally it is necessary to carry out 1-2 vines promotion before the end of August. In order to control the length and growth of the main stem and promote the development of lateral vines and vine growth, after the sweet potato is planted, when the main stem grows to 12 knots, the top growth point is removed and the lateral vine growth is promoted; when the vine spreads to 12 knots Then, the top growth point of the vine was removed and the contradiction between the ground and the ground was coordinated to promote the expansion of the tuber. Drought-free row During the expansion of the tuber, if there is no rainfall for 10 to 15 days, it should be watered in time to ensure the normal need for water during the expansion of the tuber, but water should not be applied 20 days before the harvest. In the event of Qiuyu, it is necessary to drain the drain in time to prevent the rot of the tuber. Skillfully applying big fertilizer In September, when the tubers are inflated and cracks appear in the surface soil layer, fertilization can promote the expansion of tubers. Can use urine 750 to 1000 kilograms per acre 500 kilograms of water to irrigation at about 5 o'clock in the afternoon, or 500 grams of potassium dihydrogen phosphate per acre (first dissolved in warm water) water 500 kilograms of water in the cracks in the soil, or 2.5 kg of urea, 10 kg of superphosphate (dissolved first with a small amount of water) per mu, 500 kg of water, or 100 kg of ash per acre, soaked for 5 hours, filter out impurities, 500 kg of water for irrigation . No matter which of the above methods is used to fertilize the liquid, the movement should be slow. After fertilization, cracks should be immediately sealed with fine soil. This will not only reduce the exertion of fertilizer effect and water evaporation, but also play a role in drought tolerance and seedling protection. effect. In the late stage of sweet potato growth, spray 3% to 5% of superphosphate solution or 0.3% of potassium dihydrogen phosphate solution of 75 to 100 kg per acre to promote tuber enlargement. Pest control In the late growth stage of sweet potatoes, leaf roller moths are easily damaged. When leaf roller moths occur in large quantities, they can eat sweet potato leaves. Therefore, when the sweet potato has not been rolled before 3 larvae, use 2.5% deltamethrin cream 3000 times or 2.5% kung fu. Emulsion 5000 times or 25% diflubenzuron No. 1 500 to 1000 times for control. Spraying should be done after 5 pm on sunny days. Timely harvest To harvest sweet potato in time and keep the summer potatoes harvested, they should be harvested before and after the frost, so as to avoid freezing damage. Sichuan Red Chili Powder,Szechuan Peppercorn Powder,Sichuan Chilli Powder,Chinese Prickly Ash Powder jiangmen city hongsing food co., ltd. , https://www.jmhongsing.com
The quality and high yield of sweet potato in the middle and late period