New rice yield record was continued to be made under the idea of morphological improvement and heterosis utilization in recent years. The latest breakthrough of yield ceiling has been made last year and the new world record is 15.4 t/hm~2 in Xupu county, Hunan province, China. In order to reveal the essence of high yield achieved in super hybrid rice, the phase Ⅳ pioneering combination YLY900 and the control varieties including the phase Ⅲ typical combination YLY2 and the classical three-line combination Sh...
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