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草地学报  2015 

追施氮肥对苏丹草碳氮代谢及种子产量的影响

DOI: 10.11733/j.issn.1007-0435.2015.01.028, PP. 180-186

Keywords: 苏丹草,种子产量,追施氮肥,碳氮代谢

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Abstract:

以新苏2号苏丹草(Sorghumsudanense‘XinsuNo.2')为材料,采用单因素完全随机区组设计,在拔节、孕穗和灌浆期以固定比例追施尿素(0,150,300,450,600,750kg·hm-2),揭示不同氮(N)处理苏丹草碳氮代谢及种子产量性状变化规律.结果表明追施氮肥有效提高了碳氮代谢水平,随氮肥追施量增加,苏丹草叶片与茎秆中碳氮含量显著增高,施氮量大于600kg·hm-2后,总糖和全氮含量均不同程度下降.整个生长期随施氮量增加,苏丹草茎叶碳氮比(C/N)呈逐渐减小趋势,且不追肥、施氮肥150kg·hm-2与其它处理间存在显著差异(P<0.05).氮肥可有效增加种子千粒重、穗粒数,从而使苏丹草种子产量明显增加.然而,随施氮量增加产量增加幅度明显减小,施氮150与300kg·hm-2产量增幅分别达23.7%和32.2%,而施氮750kg·hm-2产量增幅仅为3.9%,追施氮肥600kg·hm-2可获最大种子产量3815kg·hm-2.综合碳氮积累、C/N及种子产量表现,试验条件下以追施氮肥600kg·hm-2为最佳.

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