Relationships of Row Direction and Quantity of Population Light Interception in Seed Setting Stage in Rice with Different Panicle Type

The rice varieties Shennong265 and Shennong6014 with erect panicle type and Tiejing4,Liaoyan16 with curve panicle type were used as materials for field experiment to study the effects of south-north row direction and east-west row direction on matter production and yield from 2007 to 2008.The quantities of population light interception in rice with different panicle types were analyzed by sensitive film method.The results showed that there was no significant difference in matter production and distribution,yield and yield component in different row direction in rice with different panicle type.It suggested there were no direct relationship between row direction and yield in rice no matter with erect panicle types or curve panicle type.The average values of quantity of population light interception in rice with erect panicle type were higher than that with curve panicle type in seed-setting middle stage,which increased 10.36%,12.88%,27.11%,10.79% above ground 20cm,40cm,60cm,80cm,respectively.The features of rice varieties with erect panicle type were that biomass improved and economic coefficient didn't decrease significantly,and number of grains per panicle and seed setting rate synchronized to improve.Therefore yield was still higher than that with curve panicle type although the number of panicle and thousand grains weight were low.It was suggested that the main reason why yield potential of rice with erect panicle type were higher than that with curve panicle type was light environment in middle-lower part of population were improved.In addition,the relationship between panicle type and light energy utilization of population were discussed.