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时间:2018-04-15
《施氮量对旱地胡麻养分积累_转运及氮素利用率的影响》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、中国油料作物学报2014,36(3):357-362ChineseJournalofOilCropSciencesdoi:10.7505/j.issn.1007-9084.2014.03.010施氮量对旱地胡麻养分积累、转运及氮素利用率的影响111*12谢亚萍,吴兵,牛俊义,孙芳霞,宋满刚(1.甘肃农业大学农学院,甘肃兰州,730070;2.鄂尔多斯市农业科学研究所,内蒙古东胜,017000)摘要:通过田间试验,研究不同施氮量对胡麻产量、氮素积累转运及氮肥利用率的影响。结果表明,在本试验土壤肥力条件下,无论施氮与否,胡麻各器官不同生育阶段氮素养
2、分吸收、累积和转运规律的基本趋势一致,但其-2变化量与施氮量有极大关系。施氮量为55.2kg·hm时,叶和茎中的氮素向籽粒的转移量、转移率及对籽粒氮素的贡献率最大;叶中氮素向籽粒的转移量、转移率及贡献率要比茎高出89.18%、83.36%和86.36%。胡麻籽粒中47.10%~57.66%的氮素来源于叶,22.46%~30.94%的氮素来源于茎,21.00%~30.48%来自籽粒生长后期从土-2壤中吸收。施氮量为27.6、55.2、82.8kg·hm时,胡麻籽粒产量分别比不施氮增加了10.21%、16.92%和-215.55%。施氮量为27.6
3、~55.2kg·hm时,氮肥的表观利用率、偏生产力分别为51.10%~68.63%和51.54~-1-297.16kg·kg。本试验条件下,综合考虑产量、氮肥利用率及生态环境,施氮量在27.6~55.2kg·hm为宜。关键词:氮;旱地胡麻;积累;转运;氮素利用效率中图分类号:S565.906文献标识码:A文章编号:1007-9084(2014)03-0357-06Effectofdifferentnitrogenlevelonnutrientsaccumulation,transferandnitrogenutilizationefficien
4、cyofdrylandoilflax111*12XIEYa-ping,WUBing,NIUJun-yi,SUNFang-xia,SONGMan-gang(1.AgronomyCollege,GansuAgriculturalUniversity,Lanzhou730070,China;2.OrdosInstituteofAgriculturalSciences,Dongsheng017000,China)Abstract:Fieldexperimentswerecarriedouttodeterminetheeffectofdifferentn
5、itrogenapplicationratesonnitrogennutrientuptake,transferandnitrogenutilizationefficiencyofdrylandoilflax.Theresultsindicatedthatdifferentnitrogenapplicationratesaffectednitrogennutrientuptake,accumulationandtransferatdifferentgrowthstages,andchangestendencieswereconsistant.T
6、heamountofnitrogentranslocationfromleaf,translocationeffi-ciencyandcontributiontograinwere89.18%,83.36%and86.36%higherthanfromstem.Thenitrogeningrain,amongwhich47.10%-57.66%wastransferredfromleaf,22.46%-30.94%wastransferredfromstemand21.00%-30.48%wasabsorbedfromsoil.Theresul
7、tindicatedthatcomparedtononitrogenapplication,the-2yieldofnitrogentreatments(as27.6,55.2and82.8kg·hm)increased10.21%,16.92%and15.55%,re-spectively.Thenitrogentransferamounts,transferefficiencyandcontributionefficiencyofleafandstemtograin-2weremaximumwhenthenitrogenapplicatio
8、nratewas55.2kg·hm.Withincreasednitrogenapplicationrate,apparentnitrogenreco
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