关键词: 净辐射, 净辐射

Abstract:

In order to clarify the optimum row spacing and transplanting density per hill of japonica rice with high-yield and good quality in cold regions, an experiment was carried out to study the effect of row spacing and transplanting density per hill on rice yield and quality in cold region used random block design. A high-yield and good-quality variety ‘Dongnong 09-51’ was used as test material. The results showed that, there was a significant influence of row spacing on yield and its components, processing qualities and cooking and eating qualities as well as RVA characters (except for consistency) at 5% or 1% level; and there was also a significant influence of transplanting density per hill on yield and its components, processing qualities and cooking and eating qualities as well as RVA characters (except for holding viscosity and final viscosity) at 5% or 1% level; moreover, their interactive effect on yield and its components, processing qualities and cooking and eating qualities as well as RVA characters was significant at 5% or 1% level. The yield of A2B2 was the highest in all treatments, but the cooking and eating quality of A2B2 was better than the other treatments except for A3B2 and A2B3, which was in accordance with that of RVA analysis. Therefore, with the view of high yield and good quality as well as increasing efficiency, based on utilization of the interactive effect of row spacing and transplanting density per hill, the treatment of row spacing 30 cm with 4 seedlings per hill was better to increase yield and improve quality for japonica rice transplanting in cold region.