不同去根处理对夏玉米根系形态、干物质积累和产量的影响

In order to make clear if root redundancy is exist in high density and high yield maize population, field experiment was conducted at the Xinji experimental station of Agricultural University of Hebei during 2014-2015. The effects of different root-cutting treatments on root morphology，dry matter accumulation and partitioning, and grain yield were studied using maize hybrid Zhengdan 958 as material under planting density of 75000 plants/ha in the field. The treatment was done in large bell shaped stage (DR) and silking stage (TR), respectively. The results showed that compared with CK treatment, the grain number, 1000-grain weight and yield of TR treatment could be increased by 8.70%, 4.74% and 1.98%, respectively, while for DR treatment they could be reduced by 16.60%, 10.29% and 2.74%, respectively. With the advance of growth, the whole plant dry matter weight above ground and partitioning to ears were gradually increased, and TR treatment were 0.72% and 4.96% higher than that of CK. The root length in 0-10cm soil layer, especially the roothair length between 0.5-1.0mm in diameter which is conducive to absorb water and nutrients were increased. The root surface area and volume in each soil layer were significantly increased by DR treatment, while for TR treatment the increase was only in 0-10cm soil layer. It can be deduced from the study that root redundancy is exist and maize yield could be improved by properly root cutting at silking stage for high planting density and high yield maize population.