Comparative evaluation of biological and chemical methods to determine nitrogen mineralisation coefficient of tropical rice soils.

Sahrawat, K L (1989) Comparative evaluation of biological and chemical methods to determine nitrogen mineralisation coefficient of tropical rice soils. ORYZA-An International Journal on Rice, 26 (3). pp. 273-276. ISSN 0474-7615

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Abstract

Two anaerobic incubation methods (30°C for 2 weeks; 40°C for 1 week) and five chemical methods, based on ammonium released by the action of hydrogen peroxide (H2O2), alkaline permanganate, acid permanganate, acid dichromate, and dilute sulphuric acid, were used to determine nitrogen mineralization coefficient (fraction of total nitrogen released as mineral N) of 39 Philippine rice soils with a wide range of organic C, total N, and other properties. Hydrogen peroxide oxidation method gave the highest average nitrogen mineralization coefficient (26.9%) and acid dichromate extraction the least (2.9%). Anaerobic incubation methods gave average nitrogen mineralization coefficients of 4.2 (30°C, 2 weeks) and 5.1% (40°C, 1 week), resp.

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Subjects:	Others > Soil Science
Depositing User:	Mr Sanat Kumar Behera
Date Deposited:	30 Nov 2011 13:32
Last Modified:	23 Jan 2012 08:05
URI:	http://oar.icrisat.org/id/eprint/4578
Official URL:	http://indianjournals.com/ijor.aspx?target=ijor:or...
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	UNSPECIFIED
Links:	Author

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