Abstract
A high quality of population is necessary to achieve high grain yield in rice, but little information is available on understanding how cultivation patterns affect population quality. In this study, two japonica hybrid rice cultivars Changyou 3 and Changyou 5 were grown in the field, with six cultivation patterns including no nitrogen application (0N), local high yielding cultivation (control), cultivation for high yielding and high efficiency (CHYHE), super high yielding cultivation (SHY), cultivation for super high yielding and high efficiency (SHYHE) and cultivation for high use efficiency of N (HUEN). The results showed that, the average yields of two cultivars under SHY and SHYHE were 12.0 t ha –1 and 10.9 t ha –1 , respectively, and 41.6% and 29.1% higher than these of control. Compared with the control, the SHY and SHYHE also significantly increased percentage of productive tillers, biomass from heading to mature, efficient and high efficient leaf area, grain-leaf ratio, leaf photosynthetic rate and SPAD values after anthesis , root-shoot ratio, and root bleeding after heading. The results indicated that the population quality of rice could be improved and higher yield could be achieved through integrating and optimizing cultivation techniques in rice production.
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