摘要
为探明再生稻再生力形成对头季稻不同收割时间和留桩高度的响应及其与产量的关系,以三系杂交籼稻渝香203为材料,设置裂区试验,主区为收割时间,副区为留桩高度。收割时间分别为头季稻齐穗后18(T_(1)),21(T_(2)),24(T_(3)),27(T_(4)),30(T_(5))d,留桩高度分别为25(H_(1)),35(H_(2)),45(H_(3))cm,分析了不同收割时间和留桩高度对再生力和产量的影响及其互作效应。结果表明:随留桩高度增加,再生稻再生力显著增加,产量无显著差异。推迟收割时间,再生稻产量先增加后降低,差异达到显著水平;在中、低留桩高度处理下,T_(3)处理产量最高,同时,中稻-再生稻两季产量达到最高水平,这归因于再生稻较高的再生力、有效穗和千粒质量;高留桩下T_(4)处理再生稻产量最高,中稻-再生稻两季产量在T_(5)处理产量最高,这归因于再生季较高的有效穗。相关分析表明,再生稻产量与有效穗显著正相关,高峰苗、有效穗与再生力显著正相关。说明再生力是通过影响高峰苗和有效穗来间接影响再生稻产量水平。综合中稻-再生稻两季产量水平,中低留桩下,头季稻齐穗后24 d收割利于两季高产;高留桩条件下,头季稻齐穗后30 d收割利于两季高产。
The objective of this study was to determine the effects of cutting time and cutting height on ratoon ability of ratoon rice and its relationship with grain yield.The experiment was carried out with five cutting time at days after heading 18(T_(1)),21(T_(2)),24(T_(3)),27(T_(4)),30(T_(5))d,and three cutting height,namely 25(H_(1)),35(H_(2)),45(H_(3))cm,by using hybrid rice variety Yuxiang 203.The results showed that the ratoon ability increased significantly,but the yield of ratoon rice varied with no significant difference with increasing of cutting height.With postponing cutting time of the first crop,the grain yield of ratoon rice increased significantly first,and then decreased.Under cutting height at H_(1)and H_(2)treatments,the yield of ratoon rice obtained highest value at T_(3)treatments due to its higher ratoon ability,panicle number and 1000-grain weight and thereby,the total yield of the first crop and ratoon rice showed highest value among different cutting time.Under cutting height at H_(3)treatments,the yield of ratoon rice obtained highest value at T_(4)treatment resulting of more panicles and spikelets per panicle.But the total yield of the first crop and ratoon rice achieved highest value when cutting time at T_(5)treatment.Correlation analysis showed that the yield of ratoon rice was significantly and positively correlated with panicles,and ratoon ability significantly and positively correlated with peak tiller number and panicles.These results suggested that the ratoon ability affected the yield of ratoon rice by regulation of peak tiller number and panicles.The finding indicates that the treatment that 24 days after the full heading of the first crop combined with cutting height of H_(1)and H_(2),or 30 days combined with cutting height of H_(3)promotes the total yield of the first crop and ratoon rice.
作者
段秀建
张巫军
姚雄
唐永群
文明
李经勇
DUAN Xiujian;ZHANG Wujun;YAO Xiong;TANG Yongqun;WEN Ming;LI Jingyong(Chongqing Academy of Agricultural Sciences,Chongqing 400000,China)
出处
《华北农学报》
CSCD
北大核心
2020年第S01期118-125,共8页
Acta Agriculturae Boreali-Sinica
基金
国家重点研发计划项目(2016YFD0300508,2017YFD0300105,2017YFD0301707)。
关键词
再生稻
产量
再生力
收割时间
留桩高度
Ratoon rice
Yield
Ratoon ability
Cutting time
Cutting height
