丙草胺防治水直播稻田杂草稻(oryza+sativa+f.spontanea)技术的研究

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1、万方数据垒璺墨堡垒璺!一WEEDYRICE(Oryzasativa￡spontanea)INⅥ，ATER·SEEDEDRICEABSTRACTInrecentyears，withthepromotionofwater-seededrice，weedyrice(Oryzasativa￡spontanea)hasbecomeaseriousweedrapidly．Insomeareas，ithasbecomethethirdweedandcausedhugelosses．PretilachloriSoneofthebestherbicidest

2、ocontrolgrassweeds．However,weedyriceandcultivatedricehavesimilargenetictype，SOpretilachlorislimitedtoapplytocontrolweedyrice．Therefore，ithasbecomeanurgentproblemtobroadenthescopeofpretilachlor．Inordertofindeffectiveandsafewaystocontrolweedyricewithoutdamagingtocultivatedri

3、ce，thispaperWasconductedtostudytheeffectofpretilachlorontheweedyriceandcultivatedricebylaboratorybiossayandanalyzedthefenclorimreducedthephytotoxicityofpretilachloroncultivatedricebylaboratorybiossayandfieldtrail．ItWashopedtobecomeaneffectivetechnologytoserveagriculturalpr

4、oduction．Inaddition，thispaperanalyzedthemechanismoffenclorimprotectingcultivatedricefromphytotoxicityofpretilachlorbyphysiologicalandbiochemicaltests．Detailedresultsareasfollows．1．PhytotoxicityofpretilachloronweedyriceInordertofindeffectivewaystocontrolweedyricebyusingherb

5、icidepretilachlor,thispaperstudiedtheeffectofpretilachloronweedyriceatdifferenttimeanddifferentdoseofpretilachlorbylaboratorybiossay．Theresultshowedthat225～9009a．i．／bin2pretilachlorcaused70．89％～97．47％and76．74％～99．46％inhibitionofemergenceandfreshweightatpre-emergencedate．22

6、5～9009a．i．／hrnZpretilachlorcaused56．06％"-一89．39％and47．22％～91．53％inhibitionofemergenceandfreshweightatemergencedate．225-9009a．i．／hm2pretilachlorcaused33．33％～77．27％and33．15％'---70．42％inhibitionofemergenceandfreshweightat1．5leafstage．Therefore．itwasbesttousepretilachlorforcon

7、trolweedyriceatpre-emergenceIll万方数据date．And4509a．i．／hal2pretilachlorcouldcauseabove90％inhibitionofemergenceandfreshweightatpre—emergencedate．Apartfromthis，pretilachlorwasnotsafetocultivatedrice．ThegrowthofweedyriceWasinhibitedsignificantlybutalsothericebytheherbicidepretil

8、achlor．AndcultivatedriceWasmoresensitivethanweedyricetopretilachlor．砀eEDs0ofXin一6，Nan-45a