摘要
在半旱式稻田中,采用回归正交旋转组合设计,研究了山区中低产田插秧密度(x_1)、氮(x_2)、磷(x_3)肥料对杂交稻的综合效应,建立了回归优化模型:(?)=8076.120+160.990x_2+207.810x_3-171.930x_1x_2-190.695x_2x_3-173.820x_1~2-173.550x_2~2,R=0.9120>R_(0.01)用此模型,水稻平均产量可达7995kg/ha,比对照增产63.8%。
An orthogonal rotation combination design was employed to study the effects of plant density and N and P application rates on hybrid rice crops.An optimized regression equa- tion was established:Y=8076.120+160.990x_2+207.810x_3-171.930x_1x_2-190.695x_2x_3- 173.820x_1~2-173.550x_2~2,where x_1 represents plant density and x_2 and x_3 refer to N and P rates, respectively.With the optimum stratagem suggested by this model,an average yield of 7995 kg/ha of rice grain was obtained—an increase of 63.8% over the control.
出处
《西南农业大学学报（自然科学版）》
CSCD
1991年第6期631-635,共5页
Journal of Southwest Agricultural University
关键词
杂交稻
栽培
土壤
山区
crossing
lowland rice
ciltivate
models
low productive soil/hilly
