不同夏玉米品种生育后期干物质及氮素积累分配的研究

Dry Matter and Nitrogen Accumulation and Partition of Different Summer Corn Varieties at the Later Growth Stage

选择陕西关中地区推广的10个玉米杂交种,在施氮和不施氮处理下对其产量,不同器官对籽粒氮转移量的差异进行比较分析。对10个杂交种进行分类并选择有代表性的3个品种,对各器官干物质和养分累积动态变化进行比较。结果显示,同一施氮量处理下,在玉米生育后期,不同品种各个器官的干物质和养分转移有很大差异,对 H-H型‘户单4’来说,灌浆期开始后除籽粒外的所有器官都是“源”,且植株还有较高的吸收氮素的能力,而L-L型‘豫玉22’和H-L型‘户单2000’在灌浆开始后有一段时间茎仍然作为“库”存在,且植株吸收氮素的能力下降。

Ten locally-extended corn hybrid varieties were chosen to comparatively study the yield differences of their yields and nitrogen transference of their different organs to kernel between with and without nitrogen fertilization. The ten hybrid varieties were classified and then three representative varieties were screened from them. The dynamic changes of their different organs in dry matter accumulation were comparatively examined,which indicated that at the same nitrogen rates the various organs of different varieties appeared to differ greatly in dry matter and nutrient transference at the latter growth stage. In of H-H type ‘Hudan 4’,from the kernel-filling stage on,all the organs but the kernels still functioned at the ＂sources＂ and the plants still had nitrogen-up taking capability,but in L-L type ‘Yuyu 22’ and H-L type‘Hudan 2000’ ,a while after the kernel-filling began,the stems still functioned as a ＂sink＂ and the plants showed a declined nitrogen-uptake capability.