How to manage the Autumn Sweet Potato to achieve High yield

First, select improved varieties and strong seedlings. The improved varieties such as "Sushu 7", "Sushu 8", "Yusu 303", "Xushu 18" and "Yusi 263" with early maturity, high quality and high yield were selected. the pointed, flat-headed and strong seedlings with thick and dense culms, moderate old and tender, rich pulp, disease-free, no degradation and no adventitious roots were selected, and different varieties were planted separately.

Second, re-apply base fertilizer and close planting in high ridges. In light soil or sandy soil fields, open the main ditch, surround ditch and ridge ditch, so that the ditch system is unobstructed, the bottom of the ditch is straight, and the rain stops the ditch is dry. The mu was leveled and ridged with 25-30 kg of high-efficiency compound fertilizer with N-P-K of 16-8-16 kg. There are two kinds of ridge specifications: one is ridge bottom width 1.2m, ridge height 40cm, ridge width 70cm, each ridge planting 3 rows of wrong nests (planting on horses), litter spacing 33cm, planting 5000 plants per mu; the other is ridge bottom width 1m, ridge height 33cm, ridge width 60cm, double row staggered nests per ridge, litter spacing 33cm, 4000 plants per mu, litter spacing 30cm, 4400 plants per mu. It should also be noted that the density corresponds to the growth habits of the varieties.

Third, it will be planted early when it is too late. Early planting can prolong the field growth period, increase the photosynthetic potential and improve the yield and quality. According to the reality of our city, the most suitable planting period of autumn sweet potato is from late July to early August, and it should not be postponed to the Beginning of Autumn for the sake of safe maturity. It should be noted that many farmers are used to planting only when it rains after soil preparation, and some even do not plant until late August, which is a great waste of autumn light.

Fourth, long vines are planted on a plate. On sunny afternoons or cloudy days, choose strong seedlings with tips that are not affected by drought. The seedlings are 30ml 40cm long and have 10 unfolded green leaves. Preferably, the base of the seedlings is equipped with 3 buds of 5Mel and 10cm long. When planting, first open the nest with a small "gray knife" or "ash razor", and then disk the sweet potato seedlings into a ring shape, and then bury the sweet potato seedlings into a circle, which is 13 cm deep and 6 mi 7 knots. The part of the soil should be flat, the cover soil is actually loose, and all the leaves and seedling tips are exposed. Immediately apply human and animal dung water to stabilize the trees. If the soil is dry, you can first open the pond to irrigate, harvest and then plant; in case of high temperature and strong light, you can cover with rice straw during the day and night for 3 days, or only expose the three leaves of the seedling tip when planting, and bury the rest of the leaves in the soil to facilitate the survival of the whole seedling. The main points are: pointed ivy, flat planting, buried leaves and stable trees.

Fifth, fine field management.

First, topdressing and raising seedlings: ploughing in the 10 days after planting, using human and animal dung water 20mur30 to mix ammonium bicarbonate with 15kg or urea 5kg (preferably with 40% high efficiency compound fertilizer 7Mel 10kg); at the same time, 100kg plant ash 100kg / mu mixed with calcium superphosphate 2530kg was applied to the pond, not in the pond (only human and animal manure water was used to lift seedlings with high efficiency compound fertilizer) When rattan leaves seal ridges, 21.8% zinc sulfate 0.5 kg or compound zinc fertilizer 0.8 kg is sprayed with 50 kg water per mu; in the first ten days of October, 100 grams of potassium dihydrogen phosphate, 150 grams of urea and 50 kg water are sprayed 3 times per mu.

The second is pinching and multiplying branches: removing all the tips of sweet potato seedlings when they survive can shorten vines, increase branches, increase green leaves, improve plant type, and facilitate more tubers. Note: do not turn the vine, do not "beat the rattan", only grow the rational vine to lift the vine, cut off the beard root, control the overgrowth.

Third, drainage and waterlogging prevention: clear ditches and desilting at any time, repair the ridge surface, and ensure that there is no stagnant water in the ridges and ditches.

Fourth, timely harvest: digging sweet potatoes in the first and middle of November, potato pieces for seed, food or feed; vine tips for vegetables; rattan leaf silage for feed. Note: harvesting early and too late will reduce yield, quality and storability. As a fresh potato on the market, it can be harvested in advance.