What are the temperature requirements for soybean growth?
Soybean is a temperature-loving crop, which has different requirements for temperature in different growth and development stages. firstly, the seed germination is very sensitive to temperature, the lowest temperature of germination is 6 ℃, the emergence of seedlings is 8-10 ℃, and the seedlings are slightly frozen at-4 ℃. During the whole growth period, the optimum growth temperature of soybean is 20-25 ℃, in which the optimum temperature for seedling growth is 20-21 ℃, flower bud differentiation stage is 21-23 ℃, flowering stage is 22-25 ℃, pod filling stage is 21-23 ℃, maturity stage is 19-20 ℃. The accumulated temperature for the whole growth period generally requires 2400-3800 ℃.
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What is the response of soybean growth and development to light?
Soybean is a short-day crop with a sunshine range of 9-18 hours. the shorter the light is, the more it can promote flower bud differentiation and early flowering and maturation. when the first compound leaf of soybean grows, it responds to light, and the seedlings can complete the illumination stage by 5-12 days of short-day sunshine. The appearance of calyx primordium in the plant indicates that the lighting stage has been completed. Due to the long-term adaptation to local light conditions, the short-day response of soybean is quite different. The short-day response of southern soybean varieties is strong, while that of northern soybean varieties is not sensitive to sunshine, so special attention should be paid to introduction.
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Cultivation techniques of deep pine and narrow row parallel sowing and dense planting of soybean
Soybean deep loosening and narrow row parallel sowing and dense planting is a new high-yield cultivation model of soybean after & ldquo; & rdquo; and & ldquo; & rdquo;. It synthesizes the advanced technologies such as deep loosening and rotary ploughing, keeps secret with fertilizer, increases yield with density, increases canopy area index, increases light energy interception rate, and realizes cost saving and efficiency increasing in soybean production. In the past two years, Luobei County has popularized and planted 16000 mu in United, Fengxiang, Zhaoxing and Taipinggou, with an average yield of 206kg per mu, an increase of 43% over the control.
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