High yield cultivation techniques for summer sweet potato:
In recent years, with the development of sweet potato processing, its own economic value has been increasing. The planting area of sweet potato is increasing year by year, especially the growing area of sweet potato is growing faster. In order to obtain high yield of sweet potato, the following measures should be taken:
First, snatch the plant in time. Early summer planting of sweet potato can promote early growth, early sweet potato, early seal ridge, lengthening the expansion period of tuber block. The average sweet potato, from June 20th to June 30th, has been planted every night, with an average reduction of 3%. Therefore, to grab early summer sweet potato planting, planting and strive to end at the end of June, the growth period reached more than 110 days. Only in this way can a higher yield be obtained.
Two, make good potato ridge. The ridge of sweet potato is an important factor affecting the yield of sweet potato. So make a good potato ridge. To avoid the rain hit the ridge, due to rain and ridging, soil compaction, unfavorable tuber expanding, so grab sunny day to play well, potato ridge, penetration, short. Well, through the pores of the soil can be increased, increasing permeability and water holding capacity; short ridge to prevent drainage, soil moisture saturation, which can resist drought and flood, and can keep the permeability of potato ridge.
Three, enough base fertilizer. The sweet potato needs a large amount of fertilizer, the most fertilizer rule potassium fertilizer, the nitrogen fertilizer is the second, and the phosphate fertilizer is again. Summer sweet potato growing period is short, increasing basal fertilizer was good reminder fertilizer can promote the rapid growth of stem. Base generally every 667 square meters Shi manure 2500~3000 kg, best applied more ash available potassium, and ridging when Misch potassium sulfate per 667 square 25 kg. In order to promote potato seedling early, in some Zaiyang Fertilizing Nitrogen fertilizer, generally every 667 square meters the amount of 3~4 kg, fertile soil can not. Attention should be paid to the isolation of seedlings and fertilizers. Finally, water the hole.
Four, select the vine head. Sweet potato head, strong resistance, early root, early sweet potato, high yield. Head to keep the vines planted in the parietal lobe is not dry, to achieve three points: one is with vine cutting, with planting, with water, to prevent wilting leaves; the two is left on the ground leaves to moderate, if 7 leaves, sunny morning, when planted, can keep 3 leaf buried 4 leaves, cloudy afternoon planting when can keep 4 leaf buried 3 leaves, the best is planted in the afternoon or evening; three is watering, sealing point. In addition, in order to improve the survival rate of sweet potato, it can be stained with root of sweet potato or rooting powder.
Five, reasonable and close planting. The yield of single plant of sweet potato is low, so it is generally used in small ridge and dense planting to give full play to the effect of increasing the yield of the population. Can choose the vine is short, tuber concentrated attention by varieties, reasonable density, small ridge planting, average ridge distance of 60~70 cm, 15~20 cm spacing, each 667 square meters planted 5000~6000 strains, seed can be more dense, up to 7000 lines. At the time of planting, the short seedlings were planted in deep and inclined plants, pouring water and sealing the holes, making them return to seedlings early, early growing, early sweet potato and multi knot sweet potato to create high yield.
Six. Field management
1, check the seedlings to replant. 7 days after planting, row check seedlings filled, the weak seedling seedlings on fertilizing watering.
2, in a timely manner to eliminate weed seedling cultivation hilling, timely cultivation, to facilitate fast seedling.
3, early application of seedlings, weak growth of potato seedlings, in the rosette stage in nitrogen, phosphorus and potassium fertilizer at the same time.
4, sweet potato Pengdasu spraying potassium dihydrogen phosphate and root irrigation, in add water 50 kg foliar spraying with 5 grams of sweet potato enlargement in the rosette stage and tuber expanding stage per mu, tuber expanding stage with irrigation 300 times liquid potassium dihydrogen phosphate.
5, the top does not turn over the seedling, in order to restrain the top advantage, control the main stem growth, generally do not turn over the seedlings, if the rainstorm silt seedlings can be raised, and then still place the original. The method of topping is in the length of the seedling to 30— when 50 cm, the top of the seed is 1— the 3 cm part is removed to control the extension of the vine and the bulge of the tuber.
6, inhibition of growth, the growth of tin can be applicator ash or spraying liquid or spray KH2PO4 400 200— 300PPM Paclobutrazol, too long on Wang Tian can also be appropriate to cut off part of stem and leaf as feed.
7, pest control: Seedling underground pests available 90% crystal trichlorfon 100&mdash 150 g / mu; add water 5 kg, 5 kg of wheat stir evening thrown into the field, the late Sphinx selenaria, leafrollers or other hazards, mu Sumicidin 15— 20ml or 10& mdash 15ml 2.5% decis; water 50 kg foliar spraying, if there is a black spot, with 40% carbendazim 100 times guangen.
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