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中文摘要：
在大田高产栽培条件下,研究了不同追氮时期对冬小麦百农矮抗58开花后旗叶衰老相关生理指标的影响。结果表明,起身期与拔节期追施氮肥可明显提高光合速率,抑制叶绿素的降解,并使植株体内超氧化物歧化酶（SOD）保持较高活性,丙二醛（MDA）含量下降。
英文摘要：
Under the high-yield planting condition,the effects of nitrogen applying stages on the physiological indices related to senescence of flag leaves in winter wheat Bainongaikang 58 were studied.The results showed that the nitrogen topdressing in erecting stage or jointing stage could significantly increase the photosynthetic rate,inhibit the degradation of chlorophyll,maintain the higher activity of superoxide dismutase（SOD）,and reduce the malondialdehyde（MDA） content.
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