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Simple modification of the Walkley-Black method for simultaneous determination of organic carbon and potentially mineralizable nitrogen in tropical rice soils

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Relation http://oar.icrisat.org/3994/
http://dx.doi.org/10.1007/BF02185705
 
Title Simple modification of the Walkley-Black method for simultaneous determination of organic carbon and potentially mineralizable nitrogen in tropical rice soils
 
Creator Sahrawat, K L
 
Subject Soil Science
 
Description A modified version of the Walkley — Black method of organic C determination is described, which allows simultaneous determination of organic C and potentially mineralizable N in soils. As usual the organic matter of the soil is oxidized by acid dichromate reagent by heat of dilution. The excess of chromate left after C oxidation is titrated with standard ferrous sulfate solution instead of ferrous ammonium sulfate to avoid contamination due to NH4 +. The NH4 + released due to oxidative action of acid dichromate is determined by distilling a suitable aliquot from the known volume with 50% of NaOH solution. The ammonium released by this method with 15 surface soils showed highly positive correlations with organic C (r=0.969**), total N (r=0.976**) and the NH4 + produced under waterlogged conditions (r=0.985**). The modification is very simple and is easily adaptable for estimation of potentially mineralizable N in soils alongwith organic C determination.
 
Publisher Kluwer
 
Date 1982
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/3994/1/Plant_and_Soil_69_1_73-77_1982.pdf
Sahrawat, K L (1982) Simple modification of the Walkley-Black method for simultaneous determination of organic carbon and potentially mineralizable nitrogen in tropical rice soils. Plant and Soil, 69 (1). pp. 73-77. ISSN 0032-079X