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
Links:	Author

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