不同品质类型小麦优质高产群体氮效率的差异

为给小麦分类栽培措施的确定提供依据,于2000～2002年在扬州选用5个不同品质类型小麦品种,通过不同类型小麦氮肥运筹调控试验,研究了小麦优质高产群体与普通群体的氮效率差异.结果表明,同一品种不同群体类型间氮肥农学效率、氮肥吸收效率表现为强筋和中筋小麦优质高产群体高于普通群体,而弱筋小麦优质高产群体略低于普通群体;氮素利用效率则表现为强筋小麦优质高产群体低于普通群体,中筋小麦两者之间相近,弱筋小麦优质高产群体高于普通群体;不同群体的氮收获指数差异表现为优质高产群体与普通群体相比互有高低;不同类型专用小麦的各氮效率指标与籽粒产量及蛋白质含量之间表现出不同的相关性.

Differences in N Efficiency of Population with High Yield and Good Quality among Wheat Varieties for Different End Use

Many experiments have been conducted to investigate N content,N absorption in wheat plants.The differences in nitrogen efficiency of high yield and good quality population(HP) and normal population(NP) among three types of wheat varieties for different end use were studied in experiment field(sandy loam soil) of Jiangsu Provincial Key Lab of Crop Cultivation and Physiology,Yangzhou University from 2000 to 2002.The tested varieties included strong-gluten wheat Wanmai38,medium-gluten wheat Yangmai10 and Huimai18,and weak-gluten wheat Ningmai9 and Jianmai1.The results were as follows: The agronomic efficiency of N fertilizer(NAE) and N absorption efficiency(NUEa) of HP were higher than that of NP in strong-gluten wheat and medium-gluten wheat,but NAE and NUEa of HP were lower in weak-gluten wheat.The nitrogen utilization efficiency(NUGE) of HP was lower than that of NP in strong-gluten wheat,and NUGE of HP was higher in weak-gluten wheat.Nitrogen harvest index(NHI) among wheat varieties for different end use was different.The diiferent indices of NUE had different relationship with grain yield and protein content.