Abstract:

To make sure the best sowing time in the case of global warming, effects of different sowing and transplanting date on growing period and yields and yield components of rice was studied with a method of sooner or later autumn sowing transplanting stage. Results showed that, one obvious impact was early planting to extend the growth period, and late season than early season more obvious in different sowing times with two seasons for all varieties. In early season, the actual highest yield of ‘Tianyou998’ and ‘Yuxiangyouzhan’ was 7.450 t/hm2 and 7.442 t/hm2 respectively in 15 March planting and that of ‘Tianyou428’ was 5.975 t/hm2 in 10 March. In late season, the actual highest yield of ‘Tianyou998’ and ‘Tianyou428’ was 8.477 t/hm2 and 8.055 t/hm2 respectively in 16 July planting and that of ‘Yuxiangyouzhan’ was 8.215 t/hm2 in 9 July. Correlation analysis showed that, under appropriate cultivation conditions, increasing the number of grains per panicle and panicles can increase yield. The results provided a theoretical basis to improve rice yield, utilize rationally local climate resources and arrange reasonably seeding time.