High-yielding cultivation of soybean with large ridge, narrow row and close planting
Large ridge and narrow row dense planting of soybean can increase canopy leaf index, make full use of light energy and achieve the purpose of increasing yield.
(1) selection and preparation of land. In the previous crop, corn or potato is the best. Ridges with sowing. The ridge distance is 130 cm, the ridge height is 25 cm, and the width on the ridge is 30 cm.
(2) selection of varieties. The selection of soybean varieties with large ridge and narrow row and close planting should be 168, ZOQI, 9409B, Fengshou 544, Miyuwang, Hefeng 25, he 93-BS, etc., and seeds should be selected before sowing.
(3) planting mode and density. The planting mode is 130cm large ridge with 6 rows sown on the ridge and the small row spacing is 16cm. The suitable planting mode is 40 ~ 450000 plants per hectare, and the sowing time is about the middle of May.
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The root of soybean
The root system of soybean belongs to straight root. It can be divided into main root and lateral root, both of which have dense root hairs. The main part of the root is 5-20 cm in the soil, and the whole root system is approximately bell-shaped. There is symbiosis between rhizobium and soybean on soybean root. When soybean sprouts, rhizobium invades the root. When soybean grows the first compound leaf, root nodule is formed on soybean root, first is the main root, and then gradually spreads to lateral root. Nodules are produced by rod-shaped rhizobia with 1-2 flagella at one end. It is a kind of aerobic bacteria, which mainly lives near the earth.
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Identification and control techniques of soybean downy mildew
Downy mildew occurs more frequently in soybean producing areas in China, especially in northeast and north China during the soybean growth period, and the disease aggravates in rainy years, which seriously leads to premature fall or withering of leaves, mildew of seeds and a reduction of 30% to 50%. It is mainly harmful to leaves, pods and beans of seedlings or adult plants. The pathogens on the diseased seeds caused the disease of the seedlings by systematic infection, but the cotyledons did not show symptoms. When the first pair of true leaves unfolds, chlorotic patches appear along both sides of the leaf veins and expand along the main veins and lateral veins. Cause the whole leaf to fade, there are
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