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

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Relation http://oar.icrisat.org/4560/
http://dx.doi.org/10.1080/00103627909366957
 
Title Evaluation of some chemical extractants for determination of exchangeable ammonium in tropical rice soils
 
Creator Sahrawat, K L
 
Subject Soil Science
 
Description 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.
 
Publisher Taylor & Francis
 
Date 1979
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/4560/1/CSSPA_10_7_1005-1013_1979.pdf
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