How to promote the high yield of summer sweet potato

In recent years, with the deep processing of sweet potato, its own economic value is increasing. The planting area of sweet potato increases year by year, especially the planting area of summer sweet potato increases faster. In order to achieve high yield of summer sweet potato, the following five measures should be taken:

First, it should be planted at the right time. Early planting of summer sweet potato can promote early growth, early fruiting, early ridge sealing, and prolong the expansion period of sweet potato. General summer sweet potatoes are planted one day every night from June 20 to June 30, with an average yield reduction of 3%. Therefore, the summer sweet potato should be planted early and strive to be finished in early July, so that its growth period can reach more than 110 days. Only in this way can a higher output be obtained.

Second, make the potato ridges. Potato ridge is an important factor affecting the yield of summer sweet potato. Therefore, it is necessary to make a good potato ridge. To avoid ridging after rain, due to ridging after rain, soil hardening, unfavorable potato expansion, so take advantage of sunny days to dry potato ridges, and strive to be pleasanting, transparent and short. Xuan and permeation can increase soil voids, permeability and water retention capacity; short ridges are conducive to drainage and prevent soil water saturation, which can not only resist drought and waterlogging, but also maintain the air permeability of potato ridges.

Third, apply sufficient base fertilizer. The growth period of summer sweet potato is short, and the application of base fertilizer, especially seedling fertilizer, can promote the rapid growth of stems and vines. Stem fertilizer is generally 25003000kg per 15ha of soil and miscellaneous fertilizer, it is best to apply more available potash such as plant ash, and 1015kg of diammonium phosphate is applied every 15ha of ridging. In order to promote the early development of potato seedlings, some nitrogen fertilizer can be applied at the hole when planting seedlings, usually 3-4 kg for every 15 hectares. Attention should be paid to the isolation of seedlings and fertilizers. Finally, water and seal the hole.

Fourth, choose to plant vine head. Sweet potato vine head, well-developed nutrition, strong stress resistance, early rooting, early potato fruiting, high yield. According to the experiment, the yield of summer sweet potato planting vine head is 14.1% higher than that of planting vine joint, 18.7% higher than that of planting cold potato bud, and 22% higher than that of planting hot Kang bud. When planting vine head, it is necessary to keep the top leaf not dry, and to achieve three points: first, to keep the leaves on the ground moderately, if 7 leaves are sunny, when planting in the morning, you can leave 3 leaves to bury 4 leaves, in cloudy days, when planting in the afternoon, you can leave 4 leaves to bury 3 leaves, preferably in the afternoon or evening; the third is to water and seal the hole after planting.

Fifth, reasonable close planting. The yield per plant of summer sweet potato is relatively low, so it is common to use small ridges and close planting to give full play to the role of population production in order to achieve high yield. We can choose varieties with short vines and concentrated tubers, pay attention to reasonable close planting, and adopt small ridges, with a general ridge distance of 60 cm to 70 cm, a plant spacing of 15 cm to 20 cm, a planting of 5000 to 6000 plants per 15 ha, and a denser seed potato to 7000 plants. When planting short seedlings deep oblique planting, watering enough water, sealing strict points, so that its early return of seedlings, early growth, early tuber, multi-tuber, to create high yield.