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本文用大豆与玉米、谷子不同作物的田间对比法和室内培养液栽培法相结合,研究了大豆对耕层土壤物理性状的影响,主要从土壤物理角度探讨了大豆肥田的机制.结果表明,种植大豆当年,大豆与对照作物相比,只减轻了耕层土壤中氮的消耗,并未增加土壤含氮量;大豆生育期间,其根系的分泌物和脱落物以及死亡的根系被分解后所形成的物质可起到胶结剂的作用,改善了土壤颗粒的表面性质,在根系穿插、挤压作用的动力下,有助于水稳性团聚体的形成;耕层土壤孔隙的数量、大小、形态及其分布有较大的改善,协调了土壤三相比例,耕层土壤的导水、蓄水和通气状况增强,调节了土壤肥力,认为大豆对耕层土壤物理性状具有良好的改善作用.
In this paper, soybean and corn, millet different crops field contrast method and indoor culture hydroponic method to study the effect of soybean on topsoil physical properties, mainly from the soil physical point of view of soybean fertilizer field mechanism.The results show that planting soybean In that year, compared with the control, soybean reduced the nitrogen consumption in the topsoil and did not increase the nitrogen content in the soil. During the growth of soybean, the root exudates and shedding and the root system of death were decomposed Material can play a role as a cement to improve the surface properties of soil particles, which can contribute to the formation of water-stable aggregates under the impetus of root intercalation and extrusion. The amount, size and shape of soil pores in topsoil Its distribution has been greatly improved. The three-phase proportion of soil has been coordinated. The conductivity, storage and aeration of topsoil have been enhanced and soil fertility has been adjusted. Soybean has been found to have a good effect on the physical properties of topsoil.