氮肥水平对冬大麦产量、品质和氮肥利用效率的影响及其相关分析

以扬饲麦3号、港啤1号、扬农啤2号和Frankin等4个品种为试材,分析施氮水平对冬大麦产量、品质和氮肥利用效率的影响及其相关性。结果表明:随着施氮量的增加,各品种产量、单位面积有效穗数、每穗粒数、地上部含氮量及籽粒蛋白质含量增加,千粒重下降,各品种氮肥利用效率亦下降。不同氮肥处理水平下,大麦产量与千粒重呈极显著负相关,与籽粒蛋白质含量呈显著正相关,与氮肥偏生产力呈显著负相关。地上部氮积累量与氮肥生产效率、氮肥偏生产力和氮肥生理效率呈极显著负相关,千粒重与籽粒蛋白质含量呈显著负相关。氮肥生产效率与氮肥生理效率呈极显著正相关,氮肥农学效率与氮肥偏生产力呈显著正相关,氮肥偏生产力与氮肥生理效率呈显著正相关。

Effect of nitrogen application rate on yield, quality and fertilizer-nitrogen use efficiency and its correlation analysis in winter barley

Four winter barley cultivars,named Yangsimai 3,Ygangpi 1,Yangnongpi 2 and Frankin,were used to study the yield,quality and fertilizer-nitrogen use efficiency under different nitrogen application rate and correlation between them was analyzed.The results showed that the yield,effective spikes,grain number per spike,nitrogen accumulation in aboveground and grain protein content were in positive responses to the increase of N rate.1 000-grain-weight and fertilizer-nitrogen use efficiency decreased when more N fertilizer applied.On different nitrogen application rate,the yield was correlated with 1 000-grain-weight,grain protein content and partial factor productivity of applied N.The nitrogen accumulation in aboveground was significantly and negatively correlated with N grain production efficiency(NGPE)(P<0.01),N physiological efficiency(NPE) and partial factor productivity of applied N(PFP).1 000-grain-weight was significantly negative correlated with grain protein content.NGPE was significantly and positively correlated with NPE(P<0.01),and N agronomic efficiency(NAE) was significantly and positively correlated with PFP(P<0.05),which was significantly and positively correlated with NPE(P<0.05).