水稻根系活力与稻谷生产能力

Root System Activity and Rice Grain Productivity of Rice Plant

水稻根系活力与品种的稻谷生产能力之间有着密切的关系。高产水稻的表根根活力较高，根活量下降较缓，齐穗期叶绿素含量高。“青二矮”乳熟期和黄熟后期叶绿素含量比“晚青选早”增加，根活量与叶绿素含量呈极显著相关，品种乳熟期至黄熟期根活力和根活量下降率低。

Rice grain productivity is closely related with root system activity and amount of root system activity whichmenans dry weight of roots per hill plants × root systemactivity. The rice varieties with high grain yield have highroot system activity and lowly decreasing amount of rootsystem activity at the surface layer of siol from 1-5 cm, aswell as high content of chlorophyll at heading stage. Atmilky stage and end yellow ripening stage the chlorophyllcontent of rice variety “ Qing-Er-Ai ” is higher than that of “ Wan-Qing-Xuan-Zao ”. There is a marked relationship between root system activity amount and chlorophyll. In conclusion, rice vaviety which is of low decreasing amount of rootsystem activity and activity of root system at the milky to end yellow ripening stage is considered to be able to increase grain yield.