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High-yield cultivation of sweet potato five measures
Choosing good quality varieties of high-quality potato seedlings not only can improve the survival rate of planting and early tuberization, but also can significantly increase the yield of sweet potato, generally more than 10% of the weaker seedlings. The selection of sweet potato seedlings should generally be from appearance, height and weight. Considerations. High quality sweet potato seedlings are generally large and thick leaves, dark green leaves, the top three leaves flush, thick stems, short internodes, 3-5 sections, seedling height 20-30 cm, no air rooting, no pests, 100 seedlings weighing 500 grams the above. Pay attention to the application of potassium fertilizer sweet potato is a high-yield crop, the fertilizer needs a large amount, especially the demand for potassium fertilizer. The principle of fertilization is the appropriate amount of nitrogen fertilizer, phosphorus, potassium, mainly potassium. Guanzhong West moderately fertile soil, generally Mushi urea 10 kilograms, superphosphate 50 kilograms, potassium sulfate 20 kilograms. It is recommended that ridge cultivation be used to cultivate ridges with loose soil, strong air permeability, increase soil temperature, increase surface area, promote rapid expansion of sweet potatoes, and increase potassium absorption. Generally small ridges are cultivated in a single row, with a ridge distance of 70 cm and a ridge height of 15-20 cm. Large ridges are planted in double rows with a ridge distance of 85-95 cm and a ridge height of 25 cm. The timely use of mulching film timely planting timely and early planting, can effectively extend the growth period of sweet potato, full use of the growing season to increase the accumulation of nutrients. In the western Guanzhong region of the province, the spring film-mulching time must not be earlier than the beginning of April, and premature weather may suffer from abnormal weather such as low temperatures. Improved horizontal planting and improved level planting, potato seedlings in the soil with more nodes, more joints, and fewer nutrients, water consumption, short time for slow seedlings, high survival rate of planting. The method is: dig the nest first, pour the water afterwards, and then insert the seedlings. The potato seedlings shall be laid flat with a depth of 5 centimeters, buried in a thickness of 5 centimeters, and exposed to the top three leaves.