Measurement of exchangeable NH4+ in tropical rice soils

Sahrawat, K L and Ponnamperuma, F N (1978) Measurement of exchangeable NH4+ in tropical rice soils. Soil Science Society of America Journal, 42 (2). pp. 282-283. ISSN 0361-5995

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Abstract

Measurement of exchangeable NH4+ by two methods - steam distillation of the filtrates of KCl extracts and of soil-KCl suspensions with MgO - was compared for 17 tropical soils covering a wide range in texture, pH, and organic matter. Distillation of soil suspensions gave significantly higher values for NH4+ both for aerobic and anaerobic soils, but the differences were much greater in the anaerobic soils. The higher values obtained by direct distillation of KCl-soil suspensions were probably due to hydrolysis of soil organic matter at the high pH values (9.9 to 10.7) brought about by the boiling MgO suspensions. The use of a filtered KCl extract instead of a soil suspension to measure exchangeable NH4+ in tropical rice soils is recommended

Item Type: Article
Divisions: UNSPECIFIED
CRP: UNSPECIFIED
Subjects: Others > Soil Science
Others > Fertilizer Applications
Depositing User: Mr B K Murthy
Date Deposited: 17 Nov 2011 06:09
Last Modified: 02 Dec 2011 07:56
URI: http://oar.icrisat.org/id/eprint/4008
Official URL: http://dx.doi.org/10.2136/sssaj1978.03615995004200...
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: UNSPECIFIED
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