施氮量对不同基因型水稻品种氮素吸收利用的影响

以10份干物质生产效率不同的水稻品种为材料,用土培盆栽试验研究4种不同施氮水平对水稻植株干物质积累量、氮素积累量和干物质生产效率的影响。结果表明:施氮提高了水稻干物质和氮素的积累,但不同基因型水稻品种对施氮的响应程度不同。随施氮水平的提高,不同基因型水稻植株氮含量、氮素积累量以及干物质积累量显著上升,但氮素干物质生产效率明显下降。植株氮素积累量与植株氮含量、干物质积累量呈极显著正相关,植株氮素干物质生产效率与植株氮含量、氮素积累量呈极显著负相关。种植不同基因型水稻品种的土壤氮素表观平衡间存在显著差异,此差异随施氮水平提高而更加明显。

Effect of nitrogen application on nitrogen uptaking and utilization in ten different rice varieties

Using ten rice varieties of different nitrogen dry matter production efficiency as materials,the effects of four nitrogen treatments on nitrogen dry matter production efficiency (NDMPE),dry matter accumulation (DMA) and nitrogen accumulation (NA) were investigated in pot experiments.The results showed that the nitrogen application increased DMA and NA,but different genotype rice had different increment.With the nitrogen application,the NA and nitrogen content (NC) and DMA increased significantly,but the DMPE obviously declined.The NA was significantly correlated with NC and DMA,the NDMPE was significantly negatively correlated with NA and NC.Significant difference of soil nitrogen apparent balance appeared among different rice varieties,and the difference become more obvious with the increase of nitrogen application.