不同施肥水平和种植密度对水稻根部性状的影响

为了揭示不同施肥水平、种植密度处理对沈稻3号根部性状的影响程度,以沈稻3号为试材,采用二次回归正交旋转组合设计,在大田条件下研究了水稻不同生育期肥密条件与根系参数之间的关系。试验结果表明:拔节期、成熟期插秧穴距均与根体积密度和根干重密度均呈二次曲线关系;拔节期穗数与根体积密度(r=0.593**)、根干重密度(r=0.336*)、根活性表面积密度(r=0.462**)存在着显著或极显著的正相关,每穗粒数与根体积密度(r=-0.371*)、根活性表面积密度(r=-0.369*)存在着显著的负相关。齐穗期每穗粒数与根活性表面积密度(r=-0.449**)存在着极显著的负相关;成熟期穗数与根体积密度(r=0.631**)、根干重密度(r=0.441**)存在着极显著的正相关。因此,不同施肥水平和种植密度条件下,产量构成因素与沈稻3号根部性状间均存在着密切的直接关系。

Effect of Different Amounts of N, P, K and Plant Density on Rice Root Traits

In order to promulgate the influence of different amount of N,P,K and planting density on shendao 3 root traits and identify the relationship between the fertilizer and density application levels with the character parameters of rice root at different growth stages,the experiments were carried out with Shendao 3,with the design for canonical analysis.The results showed that the transplanting density on the growth and the volume density of root,the dry weight density of root could be simulated in quadratic equation at the booting and ripening stages.The number of panicles per unit area was positively correlated with the volume density(r=0.593**),dry weight density(r=0.336*) and active surface area density of the root(r=0.462**),but the number of ripened grains per panicle was negatively correlated with the volume density(r=-0.371*) and the active surface area density(r=-0.369*) at the elongating stage.There was a negative correlation between the number of ripened grains per panicle and the active surface area density(r=-0.449**) at the heading stage,and positive correlation between the number of panicles per unit area and the volume density(r=0.631**) or dry weight density(r=0.441**) at the ripening stage.There is a direct relationship between the fertilizer,density application,yield components and the Shendao 3'root traits.