油菜秸秆还田对不同水稻品种秧苗前期生长的影响

Effects of Rape Straw Returning to Field on Early-stage Seedling Growth of Different Rice Varieties

[目的]探究油菜秸秆还田对不同水稻品种秧苗前期生长发育的影响。[方法]通过裂区试验设计,以油菜秸秆不同还田方式为主处理,水稻品种为副处理,分析油菜秸秆不还田、覆盖还田以及翻埋还田对宜香优2115和德优4727生长发育的影响。[结果]不同水稻品种在油菜秸秆翻埋还田处理下均表现为,秧苗前期的分蘖数、根长、叶面积指数及地上部分干重低于对照与秸秆覆盖还田;相同还田方式下,德优4727在所有观测时期的分蘖数、根长、叶面积指数及地上部分干重均高于宜香优2115。[结论]秸秆翻埋还田造成水稻僵苗,由于不同水稻品种对秸秆还田方式的响应不同,为适应机械化操作,生产上应推广适宜秸秆翻埋还田的水稻品种。

[ Objective ] This study aims to explore the effects of rape straw returning to field on early-stage seedling growth and development of different rice varieties. [ Method] Through a split plot experiment design, different rape straw returning methods were used as the principle treatment, and the rice varieties were treated as the assistant treatment. The effects of non-returning, mulching and overturning of rape straw on the growth and development of Yixiangyou 2115 and Deyou 4727 were analyzed. [ Result] When rape straw overturning to field was used, the tiller number, root length, leaf area index and above ground dry weight in early-stage seedlings were lower than those of control and straw mulching group, regardless of rice variety. When the same treatment method was used, the tiller number, root length, leaf area index and above ground dry weight of Deyou 4727 were higher than those of Yixiangyou 2115 during all observation periods. [ Conclusion] Straw overturning to field caused runt seedlings, as different rice varieties had various responses to straw returning methods. In order to meet the mechanized operations, rice varieties adapted to straw overturning to field could be popularized in rice production.