简介：FieldexperimentswerecarriedoutwithricevarietyofShenong91ofshortculmsanderectpaniclestostudynutrientcontentsinhigh-yiedldingriceplantsandtoincreasericeyieldbyappropriatefertilization.Nitrogen,phosphorus,potassium,magnesium,zinc,manganese,ironandcoppercontentsinriceplantsvariedwithdifferenttreatmentfactors.Therelationshipbetweenthenutrientcontentsandtreatmentfactorscouldbesimulatedusingamultiplequadraticequation.Thenutrientcontentsinplantsshouldbeappropriateforhigh-yieldingrice.Ifthemeannutrientcontentinriceplantsproducuing11tha^-1ormoreofgrain(uj)wassetasthestandardvalueandthestandarddeviation(σj)wassetastherangeofvariation,thenutrientcontentinhigh-yieldingriceplantsshouldbeμj±1.99σj.Riceleavesweresensitivetothenutrientelements.Heavynitrogendressingincreasedthecontentofnitrogeninriceplants.Sparsetransplantingalsoincreasednitrogencontent,Improperapplicationofnitrogen,phosphorusandpotassiumcouldaffectthenutrientcontentsanddecreasethegrainyield.

简介：Inthisresearch,fiveNitrariasibiricaprovenancessuchasDayiluwereselectedtodoexperimentofsalt-resistance,combiningfixedplotstestwithtypicalplotinvestigation,measuringsurvivalrateandgrowthasmainindicators.TheexperimentsofmainculturaltechnologyweredoneonNitrariasibiricain4typesofsitepreparation,3typesofplanting,3designsforplantingdensity.TheNitrariasibiricaexperimentsfortheeffectsofcurbingsaltandimprovingsoilweredonebytestingsoilnutrients,saltcontent,soilphysicalpropertiesasfocalpointsintypicalsiteof3-4yearswoods.TheexperimentresultsshowedthattheNitrariasibiricacouldsurvivewellwithsoilsaltcontentof0.6%,andthatsurvivalratedeclineddistinctivelyassoilsaltcontentexceeded0.8%.However,highsoilsaltcontentdidnotinfluencegrowthintheyearofplanting.Therewereobviousdifferencesinsalt-toleranceamongNitrariasibiricaprovenances;Dayiluwasthebestonsalt-tolerance,theother4provenanceshadnodifferences,andobviouslyinferiortoDayilu.Thedifferenttypesofsitepreparationclearlyinfluencedplantingsurvivalrate,conservingrateandgrowth.Themethodoftwo-ploughing-two-harrowingwasthebestamongall4typesofsitepreparation.Seedforestationwaslargelylimited,bared-rootedseedlingforestationmaybepopularisedwhensoilsaltcontentwaslessthan1%andsoilmoisturecontentwasbetterinspring.Forestationwithcontainerseedlingwassuitedtocoastalsalinesoilinrainyseason.TheoptimumplantingdensityofNitrariasibiricawas2505/haintheYellowRiverDeltaareainviewofcoveragerate,yieldoffruitsandcostofplanting.Generallyspeaking,Nitrariasibiricacouldeffectivelyrefrainsoilfromaccumulationofsaltinthesurfacesoil,decreasesaltcontentandincreasesoilnutrient,andheightensoilcapillaryporerate.