抛秧密度对香稻产量形成特征及调控措施研究  

Effects of broadcasted seedling density on the formation of aromatic rice yield and its regulation factors

作　　者：潘圣刚[1] 莫钊文[1] 田华[1] 罗一鸣[1] 聂俊[1] 段美洋[1] 唐湘如[1] 

机构地区：[1]华南农业大学农学院,广东广州510642

出　　处：《广东农业科学》2013年第16期1-3,10,共4页Guangdong Agricultural Sciences

基　　金：广东省自然科学基金博士启动项目(S2011040004466);教育部博士点基金(20104404120006);广东省农业攻关项目(2004B20101007)

摘　　要：为了探索抛秧密度对香稻产量形成特征的影响,并提出香稻高产形成的适宜调控措施,本研究以香稻品种巴斯马蒂和农香18为材料,抛栽密度分别为1.8×105、2.4×105、3.0×105、3.6×105、4.2×105穴/hm2,研究大田条件下抛栽密度对香稻产量形成特征的影响。试验表明,当抛秧密度为1.8×105～3.0×105穴/hm2时,随着抛栽密度的增加,巴斯马蒂和农香18成熟期的稻草重和总生物量显著增加,水稻的收获指数却显著降低。当抛栽密度为3.0×105～3.6×105穴/hm2时,巴斯马蒂和农香18的收获产量较高。而且,水稻的收获产量与总穗数和千粒重均存在显著的正相关关系;通径分析结果表明,单位面积总穗数对产量的直接贡献最大,占产量贡献总值的73.96%,其次为结实率、每穗总粒数及千粒重。In order to study the effects of broadcasted seedling density on the formation of aromatic rice yield and its regulation factors,experiment was conducted on the effect on the formation of aromatic rice yield under different broadcasted seedling density.Broadcasted seedling density in the field was 1.8 ×10^5 hill/hm2,2.4 ×10^5 hill/hm2,3.0 ×10^5 hill/hm2,3.6 ×10^5 hill/hm2,4.2 ×10^5 hill/hm2,respectively,by using two aromatic rice cultivars,Basimadi and Nongxiang18.The result showed that straw weight and total biomass at maturity stage in two cultivars Basimadi and Nongxiang18 were significantly increased,however,harvest index significantly decreased,when broadcasted seedling density was in range between 1.8 ×10^5 hill/hm2 and 3.0 ×10^5 hill/hm2.There were higher harvested yield in Basimadi and Nongxiang18 when broadcasted seedling density was in range between 3.0 ×10^5 hill/hm2 and 3.6×10^5 hill/hm2.At the same time,there was remarkably positive correlation between harvested yield and the number of total panicle and 1 000-grain-weight.The results by path analysis also revealed that the contribution to yield was the biggest in the number of total panicle,which is 73.96%.The following was seed setting rate,spikelet per panicle and 1 000-grain-weight,respectively.

关 键 词：抛栽密度 香稻 产量 收获指数 通径分析 

分 类 号：S511.01[农业科学—作物学]