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《不同控释尿素的氮素释放特性及在甘蔗上的应用研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、广西农业科学2010。41(4):345-348GmmgxiAgriculturalSciences·345·不同控释尿素的氮素释放特性及在甘蔗上的应用研究王磊1,周柳强h,谢如林“,黄金生h,黄美福za,董文斌孙,李伏生-,谭宏伟z’(1广西大学农学院,南宁530005;2广西农业科学院a农业资源与环境研究所;b蔬菜研究所,南宁530007)摘要:采用大田试验与土壤中同步埋入肥包的方法,研究了不同控释尿素的氮素释放特性及在甘蔗上的应用效果。结果显示,树脂类包膜尿素养分释放过程用Elovieh方程拟合效果较好(r--0.9796**--0.9944**
2、),该类肥料在释放前期养分释放强度大,但后期供肥能力略显不足,采用复合包膜对后期供肥有一定的作用;硫磺类包膜尿素的养分释放过程用抛物线扩散方程拟合效果较好(r=0.9914"*-0.9973**),该类肥料在释放期内均能平稳供应养分,但单独施用难以满足甘蔗生长前期的养分需求;与普通尿素相比,施用控释尿素能使甘蔗增产5.00%一11.45%,氮素利用率提高7.50%~8.23%。生产上应结合不同控释尿素的养分释放特性及甘蔗生长需肥特点,按一定比例配施混合包膜尿素,实现养分供求平衡,达到控释肥料“减量、方便、高效”的施用目的。关键词:控释尿素;氮素释放特性
3、;甘蔗产量;氮素利用率中图分类号:$566.106.2文献标识码:A文章编号:1002—8161(2010)04--0345--04N-releasingcharacteristicsofdifferentkindsofcontrolled-releaseureaandtheireffectsonthesugarcaneWANGLeil,ZHOULiu-qian928,XIERu-linh,HUANGJin-shen924,HUANGMei-fu28,DONGWen—bin孙,LIFu—shen91,TANHong-wei2。(1Agricultura
4、lCoflege,Guan函University,Nanning530005,China;2aAgriculturalResourcesandEnvironmentResearchInstitute,bVegetableResearchInstitute,GuangxiAcademyofAgriculturalSciences,Nanning530007,China)Abstract:ThepresentexperimentwasundertakeninordertostudytheN—releasingcharacteristicsofdiffere
5、ntkindsofcontrolled啪leaseUltraandtheireffectsonthesugarcane.Fivetreatments,vixCKnormalurea,瑚incoatedurea,sulfurcoatedureaandthemixtureofthecoatedureahavebeenappliedinthesugarcanefield,andthefertilizerpackageswereburiedintofieldatthesametime.TheresultshowedthattheElovichequationc
6、ouldfittheprocessofNreleasingfromresincoatedurea诵tlIgoodresults(r=O.9796料-0.9944料).ItWasfoundmoreNWasreleasedattheearlystage,andlessatalaterstage.However,tllewax/resincoatedureacouldmakeupthedeficiencyofresincoatedurea.TheprocessofN降leasefromsulfurcoatedulnacouldbewellfittedbyth
7、eparabolicdiffusionequation(r=O.9914"*-0.9973**).ThesulfurcoatedureareleasedNstably,buthardlymettherequirementofsugarcanegrowthattheearlystage.Comparedwiththecommonul船.thecontrolled—releaseureahasincreasedtllesugarcaneyieldandnitrogenutilizationefficiencyby5.O—11.4%and7.5-8.2%.r
8、espectively.Thedifferentkindsofcoatedureashould
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