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以大豆品种东农52为试材,采用裂区设计,设置3个密度和3种施氮方式,研究了启动氮加追氮对不同密度大豆氮素吸收的影响。结果表明:相同密度下,启动氮加追氮处理与氮作基肥一次施用相比,R5期后氮积累量和氮同化贡献率显著增加,其中25万株.hm-2密度下启动氮加R4追氮处理的氮积累量增加109.5%(P<0.01)。相同施肥条件下,R5期前氮积累量随密度增加而增加,而R5期后启动氮加R4追氮处理25万株.hm-2密度下的氮素积累量较20和30万株.hm-2分别增加27.4%和16.0%(P<0.05)。R5期后氮积累量和氮同化贡献率与产量呈极显著正相关。25万株.hm-2密度下启动氮加R4追氮处理获得了最高产量,与其它各处理相比提高了9.1%～25.6%(P<0.05)。
Using soybean cultivar Dongnong 52 as test material, three densities and three nitrogen application methods were set up to study the effects of nitrogen and nitrogen on nitrogen uptake of different density soybean. The results showed that under the same density, compared with the single application of nitrogen as basal fertilizer, the nitrogen accumulation and nitrogen assimilation contributions increased significantly after R5 and N2 were added at the same density. Nitrogen accumulation increased by 109.5% (P <0.01). Under the same fertilization conditions, the accumulation of nitrogen before R5 increased with the increase of density, while nitrogen and nitrogen uptake was increased by 250 000 after R5, and the accumulation of nitrogen at the density ofhm-2 was 20 and 300 000.hm -2 increased by 27.4% and 16.0% respectively (P <0.05). There was a significant positive correlation between nitrogen accumulation and nitrogen assimilation contribution and yield after R5. The highest yield was obtained with nitrogen and R4 nitrogen uptake at 250,000 hm-2, which was 9.1% ~ 25.6% higher than that of other treatments (P <0.05).