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土壤容重是衡量土壤物理性状的重要指标,也是土壤耕作的重要依据,其变化直接影响作物生长和产量形成。采用框栽,以吉育79和黑农44作为试验材料,设置4个土壤容重处理,分别为1.00、1.15、1.30和1.45g/cm~3,研究了土壤容重对大豆R_1、R_5、R_8期植株氮素含量、氮素积累量及产量的影响。结果表明:大豆植株氮素含量、干物质重、氮素积累量和产量均随土壤容重的增加呈先增大后降低的变化趋势。土壤容重1.00和1.45g/cm~3处理均不利于植株氮素含量、干物质重、氮素积累量及产量的提高,且土壤容重1.45g/cm~3处理对其抑制作用最大。在试验取样的3个时期,大豆全株干物质重和氮素积累量均为土壤容重1.30g/cm~3处理最大,并且该容重处理大豆产量最高。
Soil bulk density is an important indicator of soil physical properties and an important basis for soil cultivation. The changes of soil bulk density directly affect crop growth and yield formation. The frame planting was conducted, and four soil bulk density treatments, 1.00, 1.15, 1.30 and 1.45g / cm ~ 3, were set up with Jiyan 79 and Heinong 44 as test materials. The effects of soil bulk density on soybean R_1, R_5 and R_8 Plant Nitrogen Content, Nitrogen Accumulation and Yield. The results showed that the nitrogen content, dry matter weight, nitrogen accumulation and yield of soybean plants increased first and then decreased with the increase of soil bulk density. Soil bulk density of 1.00 and 1.45g / cm ~ 3 treatments were not conducive to plant nitrogen content, dry matter weight, nitrogen accumulation and yield increase, and soil bulk density of 1.45g / cm ~ 3 treatment of its maximum inhibitory effect. During the three sampling periods, the total dry matter weight and nitrogen accumulation of soybean were the highest when the soil bulk density was 1.30g / cm ~ 3, and the highest yield was obtained.