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分蘖末期测定,90个稻品种氮利用效率(地上部于重mg/mgN)有明显差异。最大差异达77.4％。氟利用效率的总趋势为:古老地方品种>现代有成品种,高秆品种>矮秆品种,但有例外。籼、粳稻间无规律性差异。高氮效品种的叶绿素含量明显较低,而光合速率则下降不显著。株高、叶色和叶绿素含量可作为预测水稻品种氮利用效率的指标。
At the end of tillering stage, the nitrogen use efficiency of 90 rice cultivars (shoots above the mg / mgN) were significantly different. The biggest difference of 77.4%. The general trend of fluorine use efficiency is as follows: ancient local varieties> modern finished varieties, tall stalks> dwarf varieties, with the exception. There is no regular difference between indica and japonica rice. The chlorophyll content of high N efficiency varieties was significantly lower, but the photosynthetic rate was not significantly decreased. Plant height, leaf color and chlorophyll content could be used as indexes to predict nitrogen use efficiency of rice cultivars.