不同氮素籽粒生产效率油菜品种氮素积累差异研究

2007-2008年以98个甘蓝型常规油菜品种(系)为材料,在不同氮肥水平下通过测定成熟期不同器官干重、氮素含量,采用组内最小平方和动态聚类方法对供试品种的氮素籽粒生产效率(NUEg)进行聚类并研究了不同类型品种的氮素积累差异。结果表明,不同品种氮素籽粒生产效率差异较大,类型间达极显著差异。不同类型品种的产量随着氮素籽粒生产效率的增加而增加。不同类型品种氮素积累总量差异较小;不同类型品种随着氮素籽粒生产效率增加,茎枝和果壳积累氮素减少,籽粒积累氮素增加。相关分析结果表明,氮素籽粒生产效率与茎枝和果壳氮素积累呈极显著负相关,与籽粒氮素积累呈极显著正相关。通径分析结果表明,提高氮素籽粒生产效率首先是降低营养器官中氮素积累,其次才是增加籽粒氮素积累。

Study on nitrogen accumulation in Rapeseed (Brassica napus. L) with different nitrogen utilization efficiency for grain production

In this study, 98 conventional rapeseed (Brassica napus. L) cultivars were cultured in 2007-2008 under different nitrogen application levels. Through testing dry matter weight and content of nitrogen, the tested rapeseed cultivars were classified into 6 types based on their nitrogen use efficiency for grain production (NUEg) level by the MinSSw method, to study their characteristics of nitrogen accumulation. Results showed that differences of NUEg in the cultivars used in this study were significant. The yi...