Five measures for High yield cultivation of Sweet Potato

The selection of excellent varieties of high-quality potato seedlings can not only improve the survival rate of planting and early fruiting, but also significantly increase the yield of sweet potato, which is generally more than 10% higher than that of weak seedlings. The selection and purchase of sweet potato seedlings should be considered from three aspects: appearance, height and weight. High-quality sweet potato seedlings generally have large and thick leaves, dark green leaves, flush top three leaves, thick stems, short internodes, 3-5 nodes, 20-30 cm high, no air roots, no diseases and insect pests, and 100 seedlings weigh more than 500 grams. Pay attention to the application of potash fertilizer sweet potato is a high-yield crop, and there is a large amount of fertilizer, especially potash fertilizer. The principle of fertilization is the right amount of nitrogen fertilizer, the combination of phosphorus and potassium, mainly potassium. The medium fertility soil in the west of Guanzhong usually applies 10 kg of urea, 50 kg of superphosphate and 20 kg of potassium sulfate per mu. It is advocated that ridge cultivation has loose soil layer, strong air permeability, increase soil temperature, increase surface area, promote the rapid expansion of sweet potato and improve the absorption of potassium at the same time. General small ridge single-row cultivation, ridge distance 70 cm, ridge height 15-20 cm; large ridge double-row cultivation, ridge distance 85-95 cm, ridge height 25 cm. Timely early planting with plastic film can effectively prolong the growth period of sweet potato and make full use of the growing season to increase the accumulation of nutrients. The spring plastic film cultivation time in the central and western regions of our province should not be earlier than the first ten days of April, and it will be affected by abnormal weather such as low temperature too early. The improved horizontal planting has more nodes in the soil and tubers, less nutrient and water consumption, short slow seedling time and high survival rate. The method is: first dig the nest, then pour water, and then insert the seedlings, the potato seedlings straight into 5 cm deep and then lie flat and buried, covering the soil thickness of 5 cm, exposed top trefoil.