Summer sowing sweet potato new technology
First, choose a good variety: "Good planting good seedlings, good long good potatoes." The main promotion varieties are: virus-free Xushu 22, Shangshu 19, Jinnong 1, Jinnong No. 2. About 3000 acres per acre.
Second, choose strong seedlings, timely planting early: summer potato planting time from June 15 to July 5. Planting seedlings should be immersed in seedlings to prevent disease, black bean leaf spot and stem nematode disease, etc., and potato roots should be promoted as early as possible, and early potato can be promoted to increase the survival rate.
Third, balance fertilization, increase phosphorus and potassium fertilizer, ridging planting: deep-cultivation loose soil, the tillage layer is not less than 20 cm as well. Due to the strong growth potential of virus-free sweet potatoes, as little as possible of nitrogenous fertilizers, phosphorus and potassium are applied, and the principle of coarse fat is mainly based on chemical fertilizers. General base fertilizer, Mushi coarse fat 3-5 side, generally calculated according to the yield of 3,000 kilograms of sweet potato per mu, planted in the second year Mushi DAP 30 kg, 60 kg of potassium sulfate, 1 kg of borax. The new growers in the guarantee on the basis of organic fertilizer in the middle and upper land Mushi 25 kg of potassium sulfate, the middle and lower land acres of Mushi potassium sulfate 50 kg, nitrogen fertilizer to top-dressing. Avoid using potassium chloride.
Fourth, management:
1, in order to ensure the whole seedlings, 4-5 days after planting should promptly check seedlings fill seedlings.
2. After planting seedlings, in the event of drought, the seedlings are wilting, and the watering of the seedlings will be beneficial to the survival and seedlings of the seedlings.
Insufficient basal plots, 20-30 days after the spring potato planting, 10-20 days after the summer potato planting, urea 5-10 kg. Watering fertilizer in time. At the same time to take into account the small plants and more chase, the small catch in the plant, large plants do not chase, in order to promote seedling growth consistent, balanced increase in production.
3, July 10 or so, before sealing ridges should be 2-3 times to remove weeds drought protection.
4. Before the end of August, take appropriate measures to increase vines, control stems and pods, take chemical control measures, and promptly spray paclobutrazol. How to use: Spray the first time before the beginning of the rainy season in early July When the stem vine grows to 30-40 cm, apply 5 grams of paclobutrazol per mu; the second time when the stem vine grows to 50-60 cm, 25 grams per gram of paclobutrazol The third time is when the stem vine tip began to rise, it is in the rainy season, depending on the growth of the stem vines, 30-40 grams per acre applied paclobutrazol (60 kg per acre spray liquid).
Fifth, control of suppression of prosperous, clever catch fertilizer: 45-60 days after planting, this period of time for the formation of sweet potato block, potato block expansion period, the two periods of land moisture content should be about 70%. If there is water, drain it in time. Long drought and no rain, appropriate pouring. In late August, sweet potato expansin can be sprayed in an appropriate amount and sprayed twice in intervals of 10 days. Most of the sweet potato fields in 2013 poured water in early August.
Six, pest control: timely control of underground pests. Combine cultivating mu with 5% phoxim granules 3-4kg or 50% phoxim EC 5, mix fine dried soil with 20kg. Can touch the soil or surface soil pests. In the middle growth stage, 10% cypermethrin can be used to spray 1000 times to prevent leaf-feeding pests such as sweetpotato hawkmoth, attenuated mosquito moth, sweetpotato moth and other larvae.
7. Mechanical harvest at the right time: If the local temperature is lower than 15°C, the tubers will stop expanding and the temperature will be lower than 9°C. Therefore, when the local temperature drops to 18°C, it starts to harvest, and when the temperature falls below 12°C, it is harvested. Must ensure timely harvest before frost.
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