Ratoon characteristics and yield formation of Yongyou indica-japonica hybrid rice as ratoon rice
Field experiments were conducted on the cultivation of ratoon rice using the widely used Yongyou indica-japonica hybrid rice varieties Yongyou 1540 and Yongyou 4949 as experimental materials and the indica-hybrid rice variety Longliangyou 534 as control materials to study the ratoon characteristics and yield formation of Yongyou indica-japonica hybrid rice planted as ratoon rice.The results showed that there are significant differences in the ratoon characteristics between indica-japonica hybrid rice and indica-hybrid rice.The dominant regenerated nodes of the indica-japonica hybrid rice Yongyou 1540 and Yongy-ou 4949 were the 4th and 5th nodes from top at the lower nodes,which produced a sum of 81.9%and 68.9%of effective panicles with 89.6%and 72.5%of the yield contribution in YongYou 1540 and YongY-ou 4949,respectively.The panicle length and the number of grains per panicle of these two nodes were sig-nificantly higher than that of the 2nd and 3rd nodes from top,showing a decreasing trend from the bottom to the top.The 2nd and 3rd nodes from top at the higher nodes of the Longliangyou 534 were dominant,producing 71.5%of effective panicles with 72.5%of the yield contribution.The spike rate,ratios of effec-tive panicle and yield contribution of were 89.4%,74.6%and 79.2%for regenerated seedlings of YongY-ou 4949 within 1-7 d after the first harvesting,significantly higher than those of regenerated seedlings with-in 8-12 d and 12 d above after the first harvesting.The panicle length and the number of grains per panicle in regenerated seedlings of Yongyou 1540 and Yongyou 4949 were significantly higher than those of Longli-angyou 534,with yield increase of 21.6%and 17.3%,respectively.It is indicated that the strong regenera-tion ability of the low nodes,long panicles,and large number of grains per panicle in regenerated seedlings of Yongyou indica-japonica hybrid rice are the key factors that make it easy to achieve high yield when planted as ratoon rice.
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