After detoxification, sweet potato has good germination, strong seedlings and strong seedlings, strong growth potential, early potato growth, high expansion, high yield, good quality and extremely significant yield increase. Generally, the increase rate is 35%, and the high one increases the output by about double. Its main cultivation techniques are:

First, choose a variety

Different detoxified sweet potato varieties are selected according to different cultivation purposes. Starch processing type selection Xushu 18, fresh food, baking type selection Beijing 553 or golden potato, vegetable type selection Xushu 34. Xushu 18 has been widely promoted in the 1970s, and the variety has been seriously degraded. After detoxification, the excellent species are presented, and the yield has doubled. Beijing 553 and Xushu 34 have the characteristics of wide adaptability, strong resistance to stress and high yield.

Second, the foot fertilizer

The detoxified sweet potato grows vigorously, and it is easy to cause the plant to grow. More organic fertilizer should be applied, less nitrogen fertilizer should be applied, base fertilizer should be used as the main fertilizer, and topdressing should be used as a supplement to control nitrogen and stabilize phosphorus and potassium. The ratio of base fertilizer to top dressing is 8:2. Generally, the farmer's fertilizer is more than 3 square meters, 50 kilograms of superphosphate, 10 kilograms of urea, 15 kilograms of potassium sulfate, or 40 kilograms of 4% sweet potato formula.

Third, timely ridge

In mid-June, the deep ditch ridges, the ridge distance is 40 cm, and the ditch is 25-30 cm deep.

Fourth, reasonable close planting

Detoxified sweet potatoes have strong growth potential and should not be too dense. According to the ridge, one row per ridge, the plant spacing is 35 cm, 4750 plants per mu. In the nursery field, choose the normal and robust vines, cut into a length of about 30 cm, and planted by buried three-leaf planting technique. It is necessary to leave 3 leaves in the lower part of the potato seedlings and bury them in the soil for compaction. Be careful not to break the petiole, leaving 1 or 2 leaves in the upper part. The planting time is generally carried out in the afternoon, while planting and pouring, to ensure survival.

V. Field management

First, 2 to 3 days after the detoxification of the detoxified potato seedlings, 1000 g of acetochlor per mu is sprayed with 50 kg of water for chemical weeding. The temporary yellowing of the potato leaves after spraying is normal, and has no effect on the yield. The second is to chase the seedling fertilizer about 15 days after planting, and apply 10 kg of urea to promote the early development of early potato. Third, timely control of Spodoptera litura, leaf roller moth, bridge worm, red spider. The prevention and treatment methods are the same as conventional control. Fourth, in the middle and late August, 50g of 15% paclobutrazol per acre is chemically regulated with 50kg of water. The fifth is to spray potassium dihydrogen phosphate on the foliar surface in mid-September to encourage the potato to expand. Sixth, pay attention to the elimination of water in the field during the rainy season.

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