Effects of Sowing Period on the Yield of Different Varieties of Insica and Japonica Rice
A total of 4 rice varieties, the local representative insica hybrid varieties, conventional middle rice varieties and the newly introduced japonica varieties, were selected and comparison experiments with 6 planting dates were carried out. The results showed that, with the delay of sowing date, the whole growth period of rice shortened in different degree and the leaves emerged faster. However, the leaf number of main culm presented small changes. Early sowing was conducive to high yield for the insica hybrid mid-season rice, while affected the yield of japonica hybrid combinations less. The early in-sica rice and late japonica rice of conventional varieties should not be sowed early because the interaction effect of varieties and sowing date was significant. The change of the sowing date of rice would firstly affect the setting percentage and the av-erage total grain number, followed by the effective panicles per unit area, so in order to obtain the high yield of rice, the premise of a certain amount of efficient panicle should be in the guarantee and then the big ears and the setting percentage be focused.
NETL
NSTL
万方数据
维普
