摘要
【目的】分析不同施氮水平下广西6个主栽或新育成优质常规稻品种的氮肥利用率及产量表现,为优质稻生产上选用氮高效利用品种及合理减施氮肥提供理论依据。【方法】以优质常规稻品种桂香18、桂育12、桂育9号、桂育11号、桂育18和桂育8号为试验材料,以柳沙油占202为对照(CK)品种,设0(不施氮)、112.5(中低氮)、150.0(常氮)和187.5(高氮)kg/hm^2 4个施氮水平(依次为N0、N7.5、N10.0和N12.5处理),测定分析各优质常规稻品种在不同处理下的氮肥生理利用率(PE)、农学利用率(AE)、吸收利用率(RE)和偏生产力(PFP),并比较其产量差异,评价其氮肥利用效率。【结果】6个优质常规稻品种的氮肥生理利用率和农学利用率在N7.5处理下最高,且均显著高于N12.5处理(P<0.05,下同);桂育12、桂育11号和桂育18的氮肥吸收利用率在不同处理间均无显著差异(P>0.05,下同),桂香18、桂育9号和桂育8号的氮肥吸收利用率分别在N10.0、N7.5和N12.5处理下最高;供试优质常规稻品种的氮肥偏生产力均随着施氮量的增加而显著降低;在N7.5、N10.0和N12.5处理下,桂香18、桂育12、桂育9号和桂育11号的产量差异不显著,在N7.5处理下桂育18和桂育8号的产量与其在N10.0处理下的产量差异不显著,但显著高于在N12.5处理下的产量;在N7.5处理下6个优质常规稻品种的产量显著高于CK的产量,明显高于CK在N10.0和N12.5处理下的产量,表明这6个品种在氮肥减施25%情况下仍能保持较高的产量。在产量构成因子方面,6个优质常规稻品种的每穗粒数、结实率和千粒重在N7.5、N10.0和N12.5处理间差异不显著,桂香18、桂育12、桂育11号和桂育8号的有效穗数在在N7.5、N10.0和N12.5处理下差异均不显著,桂育9号的有效穗数在N7.5处理和N10.0处理下均无显著差异,桂育18的有效穗数在N7.5处理和N12.5处理下差异不显著,CK的有效穗数随着施氮量的增加而显著增�
【Objective】Analysis of nitrogen fertilizer efficiency and yield of six high-quality conventional rice varieties at different nitrogen applications was conducted.It provides theoretical basis for the production selection of nitrogen-efficient varieties of high-quality rice and reasonable reduction of nitrogen fertilizer application.【Method】The test varieties are Guixiang 18,Guiyu 12,Guiyu 9,Guiyu 11,Guiyu 18 and Guiyu 8.The control variety is Liushayouzhan 202.Set four nitrogen fertilizer application levels:0(no nitrogen),112.5(low-medium nitrogen),150(conventional nitrogen)and 187.5(high nitrogen)kg/hm^2(The treatment sequences are N0,N7.5,N10.0 and N12.5).Determination and analysis on the nitrogen utilization of each varieties by measuring physiological efficiency(PE),agronomic efficiency(AE),recovery efficiency(RE),partial factor productivity(PFP),and yield difference was compared and nitrogen efficiency was evaluated.【Result】The physiological efficiency and agronomic efficiency of nitrogen fertilizer of six high quality conventional rice varieties were the highest under N7.5 and all of them were significantly higher than N12.5(P<0.05,the same as below).There was no significant difference in the recovery efficiency of nitrogen fertilizer of Guiyu 12,Guiyu 11,and Guiyu 18 among various nitrogen applications(P>0.05,the same as below).The recovery efficiency of nitrogen fertilizer of Guixiang 18,Guiyu 9 and Guiyu8 were the highest at N10.0,N7.5 and N12.5.The partial factor productivity of nitrogen fertilizer of tested varieties decreased significantly with the increase of nitrogen application.There was no significant difference in yield at N7.5,N10.0 and N12.5 of Guixiang 18,Guiyu 12,Guiyu 9 and Guiyu 11.The yield of Guiyu 18 and Guiyu 8 were significantly higher than that when N7.5 compared to N12.5.The yield of six high-quality conventional rice varieties at N7.5 were significantly higher than that of CK.It is higher than that of CK under treatment of N10.0 and N12.5.It showed that the yield of these
作者
刘广林
吴子帅
罗群昌
李虎
朱其南
李秋雯
陈传华
LIU Guang-lin;WU Zi-shuai;LUO Qun-chang;LI Hu;ZHU Qi-nan;LI Qiu-wen;CHEN Chuan-hua(Rice Research Institute,Guangxi Academy of Agricultural Sciences/Guangxi Key Laboratory of Rice Genetics and Breeding/Guangxi Talent Highland of High Quality Rice Breeding Research,Guangxi Nanning 530007,China)
出处
《西南农业学报》
CSCD
北大核心
2020年第8期1716-1721,共6页
Southwest China Journal of Agricultural Sciences
基金
国家重点研发计划项目(2018YFD0200302)
国家现代农业产业体系广西创新团队建设项目(nycytxgxcxtd-01-03)
广西重点研发计划项目(桂科AB1850041)
广西农业科学院基本科研业务专项(2015YT13)。
关键词
优质常规稻
施氮水平
氮肥利用率
产量
High-quality conventional rice
Nitrogen application levels
Nitrogen fertilizer efficiency
Yield
