外文翻译--免耕播种机的新型双翼型开沟器对玉米种区土壤物理特性和根系固定的影响和双圆盘开沟器相比较 英文版.pdf外文翻译--免耕播种机的新型双翼型开沟器对玉米种区土壤物理特性和根系固定的影响和双圆盘开沟器相比较 英文版.pdf

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ANDCLIMATECONDITIONS,THUSPOTENTIALLYAFFECTINGCROPEMERGENCEANDEARLYGROWTHOFARABLECROPS,PROGRESSIVELYACHIEVEDINRECENTYEARS,HASBEENCONSIDERABLE,BUTNEWIMPROVEMENTSNOWAVAILABLENEEDTOBEINDIVIDUALLYTESTEDINAFIELDTRIALATUDINENEITALY,THEEFFECTSFOURREDUCTIONBULKWASASOIL/SEEDKWWWELSEVIERCOM/LOCATE/STILLSOILTILLAGERESEARCH892006196–209PENETRATION01671987/DOI101016/JSTWORKONSOILPHYSICALPROPERTIESINTHESEEDZONEANDONCROPEMERGENCEANDEARLYROOTGROWTHOFMAIZEWEREEVALUATEDINDIFFERENTSOILSOVERA2YEARPERIOD2002–2003,INCOMPARISONWITHTHEWIDELYUSEDDOUBLEDISKOPENERWITHRESPECTTOTHEDOUBLEDISKOPENER,INGENERALTHEWIDESWEEPTYPELEDTOHIGHERSOIL–RESIDUEMIXINGWITHOUTEXCESSIVEOFTHESOILCOVERINGINDEXBEINGOBSERVED,C027ANDC06,RESPECTIVELYTHEWIDESWEEPOPENERALSOSHOWEDLOWERDENSITYANDSOILPENETRATIONRESISTANCEINTHETOP5CMSOILLAYEROFTHESEEDFURROW,ALTHOUGHNOGREATERROOTLENGTHDENSITYFOUNDINMAIZEATTHETHREELEAFSTAGE,PROBABLYDUETOTHESMOOTHINGEFFECTCAUSEDBYTHESIDECOULTERSATTHESEEDINGDEPTHCERTAINDELAYINPLANTEMERGENCEINSOMECASESWASALSOREVEALEDFORTHEWIDESWEEPOPENER,WHICHMAYBERELATEDTOTHELOWERCONTACTDEVIATIONSFROMTHISGENERALBEHAVIOURINTHEVARIOUSSOILSTEXTUREANDINITIALCONDITIONSAREDISCUSSED2005ELSEVIERBVALLRIGHTSRESERVEDEYWORDSMAIZE;NOTILLAGE;OPENERTYPE;ROOTGROWTH;SEEDZONEPHYSICALPROPERTIESABBREVIATIONSCI,COVERINGINDEX;DAS,DAYSAFTERSOWING;DDO,DOUBLEDISKOPENER;FRSD,FURROWROUGHNESSSTANDARDDEVIATION;PR,RESISTANCE;RI,RESIDUEINCORPORATION;RLD,VOLUMETRICROOTLENGTHDENSITY;SOC,SOILORGANICCARBON;WSO,WIDESWEEPOPENERCORRESPONDINGAUTHORTEL390498272723;FAX390498272774EMAILADDRESSMATTEOBERTOCCO1UNIPDITMBERTOCCO–SEEFRONTMATTER2005ELSEVIERBVALLRIGHTSRESERVEDILL200507011OFANEWKINDOFWIDESWEEPOPENERIE,SIDECOULTERSCURVEDOFUPWARDSINTHEIRFINALPARTANDSLIGHTLYANGLEDTOWARDSTHEDIRECTIONTHETECHNOLOGICALEVOLUTIONOFSEEDERSFORDIRECTDRILLINGZONEPROPERTIESANDROOTESTABLISHMENTINMAIZEZEAMAYS,LACOMPARISONWITHDOUBLEDISKOPENERTVAMERALIA,MBERTOCCOB,,LSARTORIBADIPARTIMENTODIAGRONOMIAAMBIENTALEEPRODUZIONIVEGETALI,UNIVERSITYOFPADOVA,AGRIPOLIS,VIALEDELL’UNIVERSITA16,35020LEGNARO,PADOVA,ITALYBDIPARTIMENTOTERRITORIOESISTEMIAGROFORESTALI,UNIVERSITYOFPADOVA,AGRIPOLIS,VIALEDELL’UNIVERSITA16,35020LEGNARO,PADOVA,ITALYRECEIVED17FEBRUARY2005;RECEIVEDINREVISEDFORM13JULY2005;ACCEPTED29JULY2005ABSTRACTACCORDINGTOTHEKINDOFOPENERAPPLIED,NOTILLAGESEEDERSCANVARIOUSLYMODIFYSOILPHYSICALPROPERTIESINRELATIONTOSOILEFFECTSOFANEWWIDESWEEPOPENERFORNOTILLPLANTERONSEEDRESEAR1INTRODUCTIONINTHELASTFEWYEARS,THEECONOMICANDENVIRONMENTALIMPLICATIONSOFCONVENTIONALTILLAGE,SUCHASEROSION,COMPACTIONANDINVERTINGSOILLAYERS,HAVELEDTOREEXAMINATIONOFNOTILLAGEEVENINITALYSARTORIANDPERUZZI,1994ESPECIALLY,INTHEHEAVYSOILSOFTHISCOUNTRY,DEEPPLOUGHINGAIMSATINCREASINGSOILPOROSITY,ATLEASTTEMPORARILY,INORDERTOCREATESUITABLECONDITIONSFORBOTHSEEDGERMINATIONANDROOTGROWTHSIMPLIFICATIONOFWEEDMANAGEMENTANDHIGHERGRAINYIELDSOFSUMMERCROPSLIKEMAIZEAREGENERALLYACHIEVEDWITHRESPECTTONOTILLAGE,ASEVIDENCEDBYTHEFEWDATAAVAILABLEINTHELITERATUREFORITALYEG,BONAETAL,1995THEPERFORMANCEOFNOTILLAGESEEDERSDEPENDSONSEVERALFACTORSRELATEDTOFIELDCONDITIONS,INCLUDINGTYPEANDAMOUNTOFRESIDUESATSOILSURFACE,OPENERDESIGNMORRISON,2002ANDTHECROPTOBESOWNTHEIMPLEMENTSOFTHESESEEDERSMUSTHAVEHIGHFLEXIBILITY,SOTHATVARIOUSCROPSCANBESOWNINDIFFERINGFIELDCONDITIONSWITHCORRECTSEEDDEPOSITIONEG,DENSITY,DISTANCE,DEPTHINNOTILLAGEPRACTICES,THECHARACTERISTICSOFTHESEEDFURROWPLAYANIMPORTANTROLEINGERMINATIONMANYAUTHORSHAVEPOINTEDOUTTHATTHEMOSTSIGNIFICANTFACTORSREGULATINGGERMINATION,SUCHASSOILMATRICPOTENTIAL,TEMPERATURELINDSTROMETAL,1976;SCHNEIDERANDGUPTA,1985ANDSOWINGDEPTHALESSIANDPOWER,1971;MAHDIETAL,1998AREAFFECTEDBYTHESOIL/OPENERINTERACTIONTESSIERETAL,1991A,BINPARTICULAR,INORDERTOMAINTAINCONSTANTSOWINGDEPTH,VARIOUSTYPESOFLINKAGESBETWEENOPENERANDSEEDERTOOLBARHAVEBEENPROPOSEDDURINGTHELASTFEWDECADESFORINSTANCE,CONNECTIONWITHASPRINGSYSTEM,THEOLDESTBUTSIMPLESTSOLUTION,ISNOTALWAYSADEQUATETOGUARANTEEUNIFORMITYOFSOWINGDEPTH,ESPECIALLYINHEAVYSOILSGREATIMPROVEMENTSHAVEBEENOBTAINEDWITHPARALLELLINKAGE,SINCETHISALLOWSTHEOPENERTOFOLLOWSOILSURFACEPROFILESACCURATELYMANYOFTHECHARACTERISTICSOFTHESEEDZONEINNOTILLAGEDEPENDSONTHETYPEOFOPENERATTACHEDTOTHESEEDERWILKINSETAL,1983ANDTHETWOMAINTYPESUSED–TINEANDDISK–MAYLEADTOGREATDIFFERENCESTHETINEOPENERTYPICALLYCREATESANAPPRECIABLEBURSTINGEFFECTINTHESOILANDGENERALLYMOVESACONSIDERABLEQUANTITYOFFINEDAMPERAGGREGATESTVAMERALIETAL/SOILTILLAGETOWARDSTHESOILSURFACE–AFACTPARTICULARLYAPPRECIABLEINTOOLSHAVINGANASYMMETRICSHAPEDARMORAANDPANDEY,1995BUTWHICHMAYBENEGATIVEIFARAINLESSPERIODOCCURSAFTERSOWING,ASSOILDRYINGISACCELERATEDCHAUDHURI,2001INSIMILARCONDITIONS,THEDISKOPENERMAYCAUSEMOREPROGRESSIVEWATERLOSSINTHESOILLAYERABOVETHESEEDSTHANTHETINEOPENERTESSIERETAL,1991A,B,ALTHOUGHGREATDRAWBACKSAREOBSERVABLEINWETCLAYSOILSBECAUSEAPERMANENTUNCLOSEDFURROWISCOMMONLYCREATEDSARTORIANDSANDRI,1995ITISWIDELYRECOGNISEDTHATMANAGEMENTOFCROPRESIDUESPREVIOUSCROPISONEOFTHEMOSTIMPORTANTCONSTRAINTSFORADOPTINGNOTILLAGECARTER,1994TINEOPENERSSHIFTORGANICDEBRISINTHESOILSURFACEFROMTHECROPROWSIDEWAYS,WITHPOSSIBLEPLUGGINGOFTHESEEDERIN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本文标题:外文翻译--免耕播种机的新型双翼型开沟器对玉米种区土壤物理特性和根系固定的影响和双圆盘开沟器相比较 英文版.pdf
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