氮素施用方式对春小麦花后叶片衰老与产量的影响  

Effect of Nitrogen Application on Flag Leaf Senescence and Yield of Spring Wheat

作　　者：郭改玲[1] 刘克礼[1] 高聚林[1] 张永平[1] 郝德春 史建国[1] 

机构地区：[1]内蒙古农业大学,内蒙古呼和浩特010019 [2]内蒙古立凯农业种植有限公司,内蒙古呼和浩特010020

出　　处：《麦类作物学报》2006年第5期126-129,共4页Journal of Triticeae Crops

摘　　要：为进一步了解氮肥运筹对春小麦衰老及产量的影响,以春小麦宁春4号为材料,将151.5 kg/ha的追氮量分别采取三叶期与孕穗期的不同追氮比例(分别为7∶3、5∶5、3∶7),研究春小麦开花后各生理指标的变化。结果表明,随着氮肥后移量的增加,开花后旗叶叶面积指数、叶面积持续期、净光合速率、旗叶气孔导度、POD活性都表现为增加的趋势。单株成穗数表现为7∶3处理的最高,但小穗数、穗粒数、千粒重降低,不利于最终产量的形成;5∶5和3∶7处理的产量构成因素相关不大,但3∶7处理的产量性状均优于其他处理。由此可见,适当加大生育中后期追氮比例可明显延缓春小麦叶片的衰老进程,有利于增加籽粒灌浆期光合产物的形成和积累并提高籽粒产量。In order to know the influence of nitrogen application method on the senescence of flag leaves and the yield of spring wheat, the dynamics of physiological character of spring wheat after anthesis were studied after nitrogen application at three-leaves and booting stages with the ratio of 7 ： 3,5 ： 5 and 3 ： 7, respectivdy. The result showed that the LAI, LAD, Pn, Cs and the activity of POD of flag leaves were all increased when more nitrogen was used in the booting stage. The effective ears were highest in the treatment of 7 ： 3, but the spikelet number, kernal-per ear and 1000-kernel weight fell down in this treatment. The yield component were similar between the treatments of 5 ： 5 and 3 ： 7, but the yield composition of 3 ： 7 treatment were better than other two treatments.

关 键 词：春小麦 氮肥 叶片衰老 产量 

分 类 号：S512.1[农业科学—作物学] S318