Evaluation of some chemical extractants for determination of exchangeable ammonium in tropical rice soils

Sahrawat, K L (1979) Evaluation of some chemical extractants for determination of exchangeable ammonium in tropical rice soils. Communications in Soil Science and Plant Analysis, 10 (7). pp. 1005-1013. ISSN 0010-3624

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Seven rice soils varying in texture, pH, organic matter and total nitrogen content were extracted with 1N and 2N KCl, 1N and 2N Nacl, 10% Nacl at pH 2.5, N CH3 CooNa at pH 3.0, and Morgan's reagent using a soil: solution ratio of 1:10. The ammonium in the extracts was determined by steam distillation with MgO. The normality of KCl or Nacl had no significant effect on the amount of NH4 + ‐N extracted but KCl proved a better extractant than Nacl. However, Nacl at pH 2.5 generally extracted significantly higher amounts of NH4 + ‐N as compared to the neutral salt solution. N CH3 CooNa at pH 3.0 did not extract more NH4 + than Morgan's reagent. Overall, KCl appeared to be better than Nacl; Nacl at pH 2.5 N CH3 CooNa and Morgan's reagent were either equally effective or better for some of the soils as compared to KCl. However, when recovery of the known amount of NH4 +‐N applied to soils was used as a criterion, the efficiency of these chemicals were in the following descending order: KCl > NaCl, pH 2.5 > NaCl > CH3CooNa, pH 3.0 > Morgan's reagent.

Item Type: Article
Subjects: Others > Soil Science
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 30 Nov 2011 11:08
Last Modified: 31 Dec 2011 05:54
URI: http://oar.icrisat.org/id/eprint/4560
Official URL: http://dx.doi.org/10.1080/00103627909366957
Funders: International Rice Research Institute
Acknowledgement: The work reported was carried out under a post doctoral research fellowship at the International Rice Research Institute, Philippines. The author is grateful to Dr. F.N. Ponnamperuma, Principal Soil Chemist for his valuable suggestions during the study and for critically going through the manuscript
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