【摘要】 探讨不同氮肥施用量对再生稻若干生理特性的影响,结果表明,随着促芽促苗氮肥施用量(57.5-287.5 kg·hm-2)的提高,功能叶的硝酸还原酶活性、叶绿素含量和净光合速率提高;适量的促芽促苗氮肥,可提高功能叶中抗氧化酶类的活性,减轻水稻衰老过程中活性氧对细胞膜的伤害,维护叶片光合机能;同时,提高伤流量, 从而保持了根系高而持久的活力。更多还原

【Abstract】 The effects of N fertilizer rates on some physiological characteristics of ratoon rice were studied. The results showed that the activity of nitrate reductase (NR), chlorophyll contents and net photosynthetic rate in the leaves of ratoon rice increased as nitrogen application rate (57. 5 - 287. 5 kg · hm-2) was enhanced. The biochemical analysis indicated that the optimum nitrogen application rate also increased the activities of cell defense enzymes , thereby reduced menbrane detriment by active oxygen species produced in the process of senescence, consequently, protected photosynthetic function of green leaves in rice and enhanced root activity, in turn delayed senescence and increased yield.更多还原