Assay of nitrogen supplying capacity of tropical rice soils

Sahrawat, K L (1982) Assay of nitrogen supplying capacity of tropical rice soils. Plant and Soil, 65 (1). pp. 111-121. ISSN 0032-079X

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The nitrogen supplying capacity of 39 wetland rice soils evaluated by two anaerobic incubation methods and six chemical methods was compared with N uptake of IR 26 rice grown on these soils under flooded conditions in a greenhouse pot study. The uptake of N by rice correlated highly with the N supplying capacity determined by anaerobic incubation methods involving incubation of soils at 30°C for 2 weeks (r=0.84**) or at 40°C for 1 week (r=0.82**) as well as with the organic carbon (r=0.82**) and total N (r=0.84**) contents of soils. Among the chemical indexes, available N determined by the oxidative release of soil N by alkaline permanganate, acid permanganate, acid dichromate and hydrogen peroxide also provided good index of soil N availability to rice. According to these results soil organic carbon and total N contents seem to be good indexes of available nitrogen in tropical wetland rice soils.

Item Type: Article
Uncontrolled Keywords: Acid dichromate - Acid permanganate - Alkaline permanganate - Anaerobic incubation - H2O2 oxidation - N uptake of rice - Organic C - Oxidative release - Soil N availability index - Total N
Subjects: Others > Soil Science
Others > Fertilizer Applications
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 15 Nov 2011 13:44
Last Modified: 20 Jan 2012 12:38
Official URL:
Funders: International Rice Research Institute
Acknowledgement: This work was carried out under a post-doctoral research fellowship at the International Rice Research Institute, Los Bafios, Philippines. I am grateful to Dr. F. N. Ponnamperuma for his valuable suggestions during planning of the work and preparation of the manuscript.
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