At present, many kinds of sweet potatoes in many places are planted in arid, thin soil and low fertility barren land. In some places, sweet potatoes are planted year after year, so the soil can not be rotated and fallow, and the soil's water and fertilizer conservation ability is reduced. Soil water and fertilizer conditions can not meet the growth requirements of high-yield sweet potato, which is one of the main reasons for low yield and poor quality of sweet potato.
Recommended fertilization method:
Seedling fertilizer: when ploughing or ridging, apply organic fertilizer such as 1~3 tons of burning soil per mu, and apply 20~30 kilograms of phosphate fertilizer per mu. Before transplanting potato seedlings, urea and carbon compound fertilizer can be applied in the center of the ridge, then the soil can be covered, the potato seedlings can be inserted or put in, and then the soil can be covered, which saves labor and effort. The potato seedlings do not contact fertilizer to prevent seedling injury, and they can absorb fertilizer nutrition as soon as possible at seedling stage, and grow early and quickly. If no fertilizer is applied during ploughing and seedling transplanting, seedling fertilizer can also be applied as early as 7~ 15 days after sowing, when seedlings and leaves turn green and erect. Generally, human excrement and urine can be sprayed appropriately, or urea and compound fertilizer can be applied. Generally, urea10kg per mu and compound fertilizer 20kg (15: 15: 65438).
1 After planting, apply strong potato fertilizer. Generally, urea15 ~ 20kg and potassium chloride 20 ~ 30kg are applied per mu, and furrowing and fertilizing can be done. If conditions permit, plant ash or burning soil on the ridge surface can be properly removed. 2. After three months of planting, consider applying strong tail fertilizer according to the growth situation, and consider late-maturing varieties or sweet potatoes with poor growth in the later period, which are generally not applied.
The advantages of irrigation, weeding, loosening soil, ridging soil, vine-turning irrigation, weeding, loosening soil and ridging soil are: sufficient water and ventilation are beneficial to high yield and high quality of sweet potatoes, and can prevent and control pests and diseases. When the weather is dry and the evaporation is large, irrigation is mainly judged according to the dry cracking of the ridge surface, and water is usually poured once every half month. Irrigation should run through the whole ridge. Generally, when the water is over half of the ridge, it is necessary to observe whether the water can gradually wet to the top of the ridge, and to observe whether the ridge is soaked when spraying water.
After irrigation, the border is slightly dry, which means weeding, loosening soil and ridging. The cracks on the ridge surface should be covered with loosening soil to prevent underground pests, such as weevils and stem borers, from getting into the border and eating root tubers and vine heads, which will affect the yield and quality. No matter after irrigation or during the whole growth period of sweet potato without drought irrigation, you can cover the border seam with border mud at any time to prevent and control pests and diseases.
Second, pepper fertilization
Pay attention to the balanced nutrition of fertilizer. Today, Bian Xiao recommended a better fertilizer-special fertilizer for vegetables. Fertilizer can activate cell vitality, promote the flashing green leaves of pepper, increase the content of vitamin C and soluble sugar, and reduce the content of nitrate in crops. Fertilizer can also quickly alleviate soil hardening, improve soil aggregate structure, make soil loose and porous, which is beneficial to pepper root absorption.