Five points must be achieved in field management of sweet potato yield and harvest per mu.

Sweet potato has rich nutritional value, a variety of practices, suitable for young and old, and with the deep processing of sweet potato, the economic value of sweet potato begins to increase year by year, the planting area of sweet potato increases year by year, how to make sweet potato high yield, need to achieve these five necessary measures.

First, reasonable seed selection and timely planting.

Comprehensively considering land resources, product uses, diseases and insect pests, and so on, select suitable varieties with high yield and high quality, and raise seedlings in time. According to statistics, one day every night, the yield will be reduced by about 3%. Therefore, early loading, prolonging the growth period of sweet potato, early fruit, early expansion, is the basis to ensure the high yield of sweet potato.

The second highest ridge and dense planting.

High ridge is also an important measure to promote the high yield of sweet potato. In sunny weather, the standard of good potato ridge is short, noisy and transparent, which is conducive to drainage, increase soil voids, promote water permeability and water retention capacity. It is most suitable to plant about 4000 trees per mu with a ridge distance of 70m ~ 80cm and a ridge height of 25m ~ 30cm.

The third hit the top, Tito.

The first time topping, when the main vine grows to about 40 cm, remove the growing point of the main vine; the second time, when the branch grows to 30 cm, remove the growing point of the branch, after topping, it can increase the branch and promote photosynthesis. at the same time, it shortens the distance of nutrient transport between roots, stems and leaves, which can quickly promote the expansion of tubers. Titian, when the rattan leaves grow, lift the vines by hand and place them in the same place, which can not destroy the original hierarchical structure of the leaves, but can restrain the adventitious roots of stem nodes and the growth of rattan leaves, generally once every 10-15 days, Titian can significantly increase production twice.

Fourth, skillfully apply foliar fertilizer and catch up with inflated fertilizer.

As the saying goes, "A sweet potato has a handful of ash, and a sweet potato forms a big pile." it can be seen that sweet potatoes love potash fertilizer. according to scientific analysis, the proportion of nitrogen, phosphorus and potassium in sweet potato tubers is 2:1:3, which shows that sweet potatoes have a great demand for potash fertilizer. In general, there will be residual nitrogen fertilizer in the soil, and the key to high yield of sweet potatoes is the rational application of potash fertilizer. 0.3% potassium dihydrogen phosphate, or 0.3% superphosphate and urea aqueous solution can be sprayed on the leaf surface, 7 Mel is sprayed once every 10 days, twice continuously, or 50 kg of plant ash per mu is directly sprinkled on the leaf surface, or 15 kg of plant ash is sprayed on the leaf surface after soaking for 24 hours, spraying on the leaf surface in cloudy days or in the evening, every 10 days.

When the sweet potato expands to crack out of the ground, it is necessary to apply expansion fertilizer at this time to promote the absorption of nutrients by roots, using 0.5Kg potassium dihydrogen phosphate per mu, adding water 400kg, or urea 2.5kg and calcium superphosphate 10kg, adding 500kg water to irrigate the cracks. Half a month later, the cracks were irrigated and sealed with 100 kg of plant ash and 500 kg of water (soaked for 4 hours).

Fifth, prevent diseases and insect pests.

Leaf curlers are easy to occur in the late growth stage of sweet potato. Targeted agents can be selected combined with 500-fold liquid spray control of new high lipid film, and the spraying effect is the best at 4: 5 in the afternoon.

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