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The first water first, followed by cracking fertilizer. During this period, due to the expansion of the tubers, cracks are easily generated at the top of the potato ridges. Pour small water on a drought-hit land plot and pour a ridge across a ridge. This saves time and water, and the amount of water can be as much as one-third of the furrow depth. When watering, cracking fertilizer 5-8 kg per mu, potassium sulfate 4-7 kg. Sweet potato is a good potassium crop, potassium is not easy to move in the soil, and the top-dressing of potash fertilizer can effectively improve the yield and quality of sweet potato.
The second removal of grass and grass. The large weeds in the sweet potato field not only compete with the stems and vines in the shoots for space to grow, affecting the ventilation and light transmission, but also compete with the underground potato blocks for soil nutrients, causing certain loss of sweet potato production.
The third spray fertilizer. The application of trace fertilizer can prevent premature senescence in the late and late stages of the growth of sweet potato, prolong the photosynthesis time of leaves, increase the yield and quality of sweet potato, and generally increase the yield by 5%-10%. Application method: Use 0.5%-1% urea solution or 0.2%-0.5% potassium dihydrogen phosphate per acre, spraying 100 kg of water on the leaves, spray once every 5-7 days, spray 2-3 times. Two kinds of micro-fertilizers, which are grown on the ground below the ground, can be combined into one.
The fourth control pests. The occurrence of leaf-eating pests in the field of sweet potato during the middle and late stages of growth is relatively serious. The larvae of sweetpotato moth and sweetpotato larvae are predominant. They eat the leaves, and the loss rate of the whole field can reach 20%-30%. Sweet potato white planthoppers are also common in potato fields, and most of them are scattered on the back of the leaves to suck juice, causing the wilting of the leaves to be not straight, and affecting the yield and quality of sweet potatoes. Control methods: Sweet potato moth, sweetpotato larvae use 80% dichlorvos emulsion 2000 times solution, or kill moth, and high-efficiency hydropermethrin 1:1 blending into 500-800 times solution or 40% Dimethoate EC 1000-1500 Double fluid. Sweet potato white planthoppers tend to yellow habits, you can use yellow traps or chemical pesticides 10% buprofloam EC 1000 times foliar spray, pay attention to spray to the back of the blade. Spray every 5-7 days, spray 2-3 times. Yan Jiaqi
During the cold season, with the continuous decrease in temperature, the expansion rate of the tubers slowed down, and yellowing and aging of the shoots and leaves of the shoots also occurred. However, this period is the focus of cultivation and management. The appropriate water and fertilizers and other measures can keep up, will extend the period of potato block expansion, and promote the improvement of sweet potato yield and quality. According to the current situation of sweet potato growth, the following field management proposals are proposed: