Comparative Study on Different Planting Patterns in Coldterra Japonica Rice Irrigated Areas

Abstract A weighing lysimeter is used to study the growth pattern and water consumption characteristics during the growth period of japonica rice with transplanting and direct-sowing planting patterns under controlled irrigation. By comparing yield components, yield and water productivity of japonica rice under different planting patterns, this paper clarifies the growth characteristics and water-consuming law during the growth period of japonica rice under different growing conditions, and contrasts the yield and water productivity of japonica rice with transplanting and direct-sowing planting patterns. The result shows: the tillering stage of japonica rice with direct-sowing planting lags behind that with the transplanting, but the growth compensation effect will be generated. Till the end of the growth period, the tillering and plant height between direct-sowing and transplanting are basically the same. In terms of grain yield, the two indicators including grain number per panicle and 1000-seed weight have a better performance in the YZ, the two indicators including effective panicles and maturing rate have a better performance in the SZB, and these four indicators are unfavorable in the HZB. However, transplanting has a distinct advantage in labor saving and mechanical aspects since it does not require rice seedling growing and transplanting, and rice does not require regreening.