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Original Articles

A microscale method for colorimetric determination of urea in soil extracts

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Pages 2519-2529 | Published online: 11 Nov 2008

References

  • Bremner , J. M. 1982 . “ Nitrogen‐Urea ” . In Methods of Soil Analysis, Part 2 , 2nd edition , Agronomy Monograph 9 Edited by: Page , A. L. 699 – 709 . Madison , WI : American Society of Agronomy .
  • Douglas , L. A. and Bremner , J. M. 1970 . Colorimetric determination of microgram quantities of urea . Anal. Lett. , 3 : 79 – 87 .
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  • Sims , G. K. , Ellsworth , T. R. and Mulvaney , R. L. 1995 . Microscale determination of inorganic nitrogen in water and soil extracts . Commun. Soil Sci. Plant Anal. , 26 : 303 – 316 .
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  • Keeney , D. R. and Nelson , D. W. 1982 . “ Nitrogen‐Inorganic forms ” . In Methods of Soil Analysis, Part 2 , 2nd edition , Agronomy Monograph 9 Edited by: Page , A. L. 643 – 698 . Madison , WI : American Society of Agronomy .
  • Douglas , L. A. , Sochtig , H. and Flaig , W. 1978 . Cplorimetric determination of urea in soil extracts using an automated system . Soil Sci. Soc. Amer J. , 42 : 291 – 292 .
  • Technicon Industrial Systems . 1980 . Urea in soil extracts , Tarrytown , NY : Technicon Industrial Systems . Industrial Method 600–80A

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