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棉花学报  2014 

河南植棉区施氮量对麦棉两熟产量及氮肥利用率的影响

DOI: 1002-7807（2014）01-0073-08, PP. 73-80

Keywords: 河南植棉区,麦棉两熟,施氮量,产量,氮肥利用率

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Abstract:

研究了河南植棉区麦棉两熟施氮量对两季产量和氮肥利用率的影响。结果表明，施氮能显著提高小麦产量、总有效穗数和穗粒数，籽粒千粒重随施氮量增加而降低；商丘和内黄试验点小麦最高产量所需的施氮量分别为201.4kg·hm-2和187.2kg·hm-2，经济最佳施氮量分别为163.0kg·hm-2和134.9kg·hm-2。施氮也能显著提高棉花产量和单株成铃数；适量施氮可提高铃重；商丘和内黄试验点棉花最高产量所需的施氮量分别为244.4kg·hm-2和224.2kg·hm-2，经济最佳施氮量分别为225.9kg·hm-2和207.0kg·hm-2。小麦氮肥利用率以施氮量180kg·hm-2最高。麦棉两季氮肥利用率，商丘试验点随施氮量增加而降低；内黄试验点以施氮量390kg·hm-2最高。小麦、棉花氮肥偏生产力、农学利用率均随施氮量增加而降低。

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