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1、STUDIESINTHEDRYINGOFSOILSi594K56opy1ATHESISPresentedtotheFacultyoftheGraduateSchoolOFCornellUniversityforthedegreeofDOCTOROFPHILOSOPHYBYMILLARDALSCHULERKLEINReprintedfromJournaloftheAmericanSocietyofAgronomy,Vol.7,No.2,March-April,1915.Inexchange^8'^^JUK.'Jv^
2、^of^1ti^^ReprintedfromJournaloftheAmericanSocietyofAgronomy,Vol.7,No.2,1915iSTUDIESINTHEDRYINGOFSOILS.^MillardA.Klein,CornellUniversity,Ithaca,N.Y.(ContributionfromtheDepartmentofSoilTechnology,CornellUniversity.)CONTEXTS.PageIntroduction50Reviev^ofLiteratur
3、e.«50Experimenti,theEffectofPreviousDryingoftheSoiltoDifferentMoistureContentsonPlantFoodintheSoilandPlantGrowth54SoilsUsed54MethodofExperimentation55EffectofPreviousMoistureContentonPlantGrowth...56Eft'ectofthePreviousMoistureContentontheMorphologicalChar-ac
4、tersofWheat;56EffectofPreviousMoistureContentonCropYield5'"^Eff'ectofPreviousMoistureContentonTotalNitrogenintheCrop...60Eft'ectofPreviousMoistureContentonCertainConstituentsintheWaterSolubleMatterintheSoil61TotalSolids61Nitrates62Potassium,Calcium,andPhospho
5、rus64LimeRequirements66Summary66Experiment2,theEffectofDryingaSoilonitsPhysiologicalCon-ditionasMeasuredbytheCarbonDioxidProductionandNitri-fication67CarbonDioxidProducedonDryingandWettingaSoil67TheEffectofDryingandWettingaSoilontheNitratesandNitri-fyingPower
6、69Summary7DiscussionandConclusions72Bibliography751AthesissubmittedtothefacultyoftheGraduateSchoolofCornellUniver-sityinpartialfulfillmentoftherequirementsforthedegreeofDoctorofPhi-losophybyMillardAlschulerKlein,B.Sc.Ithaca,N.Y-.,February,1915.Re-ceivedforpub
7、licationMarch2,1915.4950jourxat.oftheamericansociktvofagronomy.Introduction.Thedryingoftlicsoilbyexposuretointensesunlightfc^sometimthasbeenmadeuseofincertainaridregionsofIndiatoincreaseitsproductiveness.Sincethedryingofthesoilinanaridregionhasastimulatingeff
8、ectoncropgrowth,itistobeexpectedthatthelower-ingofthemoisturecontentinsoilsofthemorehumidregions,duringseasonablechanges,willinfluencetheir])roductiveness.Thedryingoftliesoilisaprocesstha
