Nitrification in some tropical soils

Sahrawat, K L (1982) Nitrification in some tropical soils. Plant and Soil, 65 (2). pp. 281-286. ISSN 0032-079X

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Nitrification of soil N in 8 mineral and 2 histosols having a wide range in pH (3.4 to 8.6), organic C (1.22 to 22.70%) and total N (0.09 to 1.20%) was studied by measuring nitrate fromation under aerobic incubation of the soil samples at 30°C for 4 weeks. The amounts of NO3-N produced in the soils varied from 0 to 123 μg/g of soil. Soil N in the two acid sulfate soils and one other acid soil did not nitrify under conditions that stimulate nitrification. Soils having pH more than 6.0 nitrified at a rapid rate and released NO3-N ranging from 98 to 123 μg/g. The two organic soils differed considerably in their capacity to nitrify though the total amounts of mineral N released were similar in these soils. The amounts of NO3-N formed in the soils was highly positively correlated with the soil pH but was not significantly correlated with the organic C of total N content of the soils. Statistical analysis also showed that nitrate formation was not significantly correlated with soil pH in soils having pH higher than 6.0.

Item Type: Article
Uncontrolled Keywords: Acid pH - Acid sulfate - Aerobic incubation - Alkaline soils - Histosols - Nitrate formation - Rice soils - Soil pH and nitrification
Subjects: Others > Soil Science
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 16 Nov 2011 13:25
Last Modified: 23 Jan 2012 08:14
Official URL:
Funders: International Rice Research Institute
Acknowledgement: I gratefully thank the International Rice Research Institute (IRRI), Los Bafios, Laguna, Philippines for financial support of this work and Dr. F. N. Ponnamperuma, Principal Soil Chemist, IRRI for valuable suggestions during planning of the work and preparation of the manuscript.
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