THE INFLUENCE OF NITROGEN ON THE DECOMPOSITION OF CROP RESIDUES IN THE SOIL
[摘要] Additionsofmineralnitrogenacceleratedtheinitialdecompositionrateofincorporatedwheatstraw,alfalfahayandglucosewhenaddedtotwosoilsdifferingwidelyinorganicmattercontent.However,inthemoreadvancedstagesofdecompositionthereversewastrue,andoverthetotalincubationperiodlargeramountsofcarbonweremaintainedinsoilssupplementedwithnitrogen.Incontrasttoallotherresiduesused,nitrogenadditionstocelluloseeffectedacontinuousandsubstantialincreaseinresiduedecomposition.Thiswastheonlyresidueforwhichthemineralizationofsoilorganicmatterdidnotsupplynitrogenadequateforitsdecompositionwithin120days.Theveryslowrateofdecompositionofsphagnumpeatcouldbeattributedtoitshighlignincontent,ratherthantothenitrogenlevels.Sulphacetolysisanalysis,whichmeasuresthenon-humifiedcarbon,indicatedthefeasibilityofseparatingnon-humifiedcropresiduesfromthemorecomplexsoilorganicmatter.Additionoforganicamendments...
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[效力级别] [学科分类] 农业科学（综合）
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