Book ChapterDOI
Nitrogen—Inorganic Forms
D.R. Keeney,D.W. Nelson +1 more
- pp 643-698
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The article was published on 2015-10-26. It has received 3503 citations till now. The article focuses on the topics: Nitrogen.read more
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Book ChapterDOI
Nitrogen - inorganic forms.
TL;DR: In this article, Bremner et al. defined the nonexchangeable NHt as the NHt in soil that cannot be replaced by a neutral potassium salt solution (SSSA, 1987), in contrast to NHt which is extractable at room temperature with such a solution.
Journal ArticleDOI
Short-term assay of soil urease activity using colorimetric determination of ammonium
Ellen Kandeler,H. Gerber +1 more
TL;DR: In this paper, a rapid assay for soil urease in the absence of bacteriostatic agents has been developed, which comprises incubation of soil with an aqueous or buffered urea solution, extraction of ammonium with 1 N KCl and 0.01 NHCl and colorimetric NH4+ determination by a modified indophenol reaction.
Book ChapterDOI
Sampling, handling and analyzing plant tissue samples.
J. Benton Jones,Vernon W. Case +1 more
TL;DR: This chapter deals with the procedures required to successfully conduct a plant analysis or tissue test and the importance of following the proper sampling, preparation, and analysis procedures.
Book ChapterDOI
Labile Organic Matter Fractions as Central Components of the Quality of Agricultural Soils: An Overview
TL;DR: In this paper, the authors considered the sensitivity of individual organic matter fractions to changes in soil management and have specific effects on soil properties and processes, and concluded that individual organics are sensitive to changes and have a specific effect on soil function.
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Journal ArticleDOI
Rapid colorimetric determination of nitrate in plant tissue by nitration of salicylic acid
TL;DR: In this article, an analysis for the rapid determination of nitrate-N in plant extracts is described. And the complex formed by nitration of salicylic acid under highly acidic conditions absorbs maximally at 410 nm in basic (pH>12) solutions.
Journal ArticleDOI
Steam distillation methods for determination of ammonium, nitrate and nitrite
J. M. Bremner,D. R. Keeney +1 more
TL;DR: In this article, steam distillation methods of determining ammonium, nitrate, and nitrite in the presence of alkali-labile organic nitrogen compounds are described, which are used for tracer studies using 15N-enriched compounds.