High-yield cultivation techniques of direct seeding soybean after wheat

Longkou City Agricultural Technology Extension Center spent two years on summer direct seeding soybean after wheat harvest. 11 varieties of Ludou were used in the experiment, and the yield per 667 square meters reached more than 300 kg. After experiment,@#@245@#@soybean direct seeding mode replaces wheat-corn interplanting mode, the benefit increases obviously, and the income increases more than 400 yuan per 667 square meters. The key techniques are early sowing, single seed sowing, density control and timely harvest.

1. Selection and treatment of varieties. Select hard culm, disease resistance and high yield varieties suitable for high yield cultivation, such as Ludou 11, 99-5, etc. Before sowing, mechanical or manual selection is carried out to remove broken petals, diseased spots, insect food grains, green grains and other impurities. The selected seeds should reach more than second-class fine seeds, with purity of more than 99%, purity of 99%, germination rate of more than 95%, and moisture content of less than 13%.

2. Sowing. The harvest period of wheat in Longkou City is about June 20, so soybean should be sown early before June 25. High-yielding fields should be sown before June 20 as far as possible. Can be direct seeding, can also be used after stubble machine stubble cleaning artificial or mechanical seeding, take a single seed seeding method. In the case of moisture content is not ideal can take the way of irrigation after sowing, so that a full seedling. Control density well and improve population uniformity. Single seed sowing method is adopted. After sowing, seedlings are thinned, fixed and reasonably densely planted. The suitable number of plants per 667 m2 is 6500~7500 in fertile and deep soil plain, and 7500~9500 in thin and shallow soil hilly area. Sowing depth 2 - 4 cm.

3. Field management. Soybean is a crop that needs more water and irrigates in case of drought. Generally, fertilizer should be applied according to soil fertility and seedling growth before branching and early flowering. For high-yield fields with wheat yield of more than 500 kg per 667 square meters, nitrogen fertilizer should not be applied and only phosphorus and potassium fertilizer should be applied; for plots with poor soil fertility, 6~7 kg of diammonium, 4~5 kg of urea and 3~4 kg of potassium fertilizer should be applied per 667 square meters, or 13~15 kg of soybean special fertilizer should be applied in open furrow. Early control of soybean aphids is an effective way to prevent virus diseases. Generally, 10% imidacloprid 2500 times solution is sprayed at the initial stage of disease. After sowing, spray the ground surface evenly with acetochlor.

IV. Timely harvest. The harvest time of soybean is the best when there are only 2~3 yellow and white leaves in the upper part of the plant. At this time, the nutrients in the plant completely returned to the seed, and the seed was full and 1000-grain weight was high when harvested.