【摘要】 对6种不同肥水管理措施下冬小麦冠层结构中叶、穗性状的变化进行了研究,结果表明,等量的氮素肥料在不同施肥时期施用,以返青期施入纯氮7kg、孕穗期施入纯氮1.5kg 效果最佳,比其他肥水管理条件下穗粒数增加2.1～6.9粒,千粒重提高1.6～3.1g。其冠层结构的表现为,有效光合叶面积加大。光合强度提高,小花分化数量多,退化数量少,幼穗发育健壮,不孕小穗减少。更多还原

【Abstract】 This paper have studied the changes of the leaf and ear characters in the canopy structure of winter wheat under different schemes of fertilizer and water management.Results show that the same amount of nitrogen applied at different stages has different effects.Application of 7 kg N/mu at shoot- turning-green stage and 1.5kg N/mu at booting stage gives the best results,that is,increase 2.1～6.9 kernels per ear and increase 1.6～3.1 grams per 1000—kernel weight than other fertilizer-water managements.The canopy structure following this management shows greater available photosynthetic leaf area,enhanced photosynthetic intensity,more differentiated florets,less degenerated florets,well- developed spikes and less sterile spikelets.更多还原