Seeding season sowing early, high temperature seedlings are long and thin; sowing too late, the growth period is limited by the frost period and the yield is low. Therefore, it is advisable to plant in Hunan from mid-August to early September.
Variety selection is selected from high temperature resistant drought, early tuber, fast tuber enlargement, high yield, good commodity, light-insensitive and short dormancy. The early maturing varieties include Feiwreituo and Dongnong 303, and the late-maturing varieties include the Atlantic and Kexin No.4.
Seeding method Seed cuttings are perishable and perishable. Severe harvesting will result. Therefore, a single small sweet potato with 0.2 cm or more potato shoots should be used after treatment. Promote shallow shallow ditch sowing, cultivation of high ridge, cover more than 8 cm. In general, every 667m2 is planted with 5000 to 5500 points, and the spacing between rows is 5025 cm. Covered shade after broadcast.
Applying basal fertilizer generally applies about 1500 kilograms of mature livestock fat per 667 square meters, 30 to 50 kilograms of phosphate fertilizer, 150 to 200 kilograms of plant-wood ash or 50 kilograms of 45% potassium sulfate compound fertilizer or 50 kilograms of special compound fertilizer. Fertilizer isolation.
Disease prevention When the potato seedlings are 10 to 15 centimeters in diameter, they are treated with leaf disease, wind, virus A, etc., respectively, and gacantia or insect pests are sprayed to prevent virus disease and tea aphid. For late blight prevention, it can use 25% 600mg of thiram Mn-Zn, or 72% Kelu 700-800 times spray.
Topdressing drought resistance depends on the soil moisture and seedling watering or immersing irrigation to keep it moist and can be top dressing when watering. In case of rain or watering, timely cultivating and weeding to see the seedlings and fertilizer, the general situation of 667m2 topdressing urea 15 ~ 20 kg, Wang long seedlings may be appropriate to chase or not chase. For excessive growth caused by excessive fertilizer, spray 0.1% of chlormequat solution or 50 to 100 mg/l paclobutrazol solution.
Due to people's concerns about health, plant products from natural sources have also received widespread attention. Natural plant tea cuts are products made by direct shearing, crushing, and other physical processing of pure plants. The product retains all the original characteristics of the plant, and the properties of the product are better packaged and can be easily transported to different places.
At the same time, the active ingredients of the product are not damaged. It is widely used in functional tea and other fields. Common products are: astragalus cut, burdock cut,etc.
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