Evaluation of Soil Tests for Predicting Nitrogen Mineralization in Temperate Grassland Soils

Abstract

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Use of 1H NMR to identify nitrogen and carbon metabolites associated with mineralizable N in grassland soil

“…A threshold of 75% similarity was selected (increasing the chance of similar‐sized groups being detected) to establish groups from among the different soil types based on their properties listed in Table and in McDonald et al . (). The two groups identified were then used as the dependent variable in a stepwise linear discriminant analysis.…”

“…However, both short‐ and long‐term incubations have been criticized for their lack of standardization in critical aspects of their methodology (e.g. sample pretreatment, temperature, incubation duration and type of kinetic models) (Griffin, ; McDonald et al ., ). McDonald et al .…”

“…McDonald et al . () highlighted several studies that justified the use of short‐term anaerobic incubations to provide a relative indicator of soil N supply across soil types (Soon et al ., ; Schomberg et al ., ). Many of these methods, however, are time consuming (e.g.…”

“…In a recent study, McDonald et al . () reported that ISNT‐N explained 69% of MN (measured by a 7‐day anaerobic incubation procedure) for a range of 35 temperate grassland soil samples. Although these results are important for quantifying the potential of these soils to mineralize N, increased knowledge and understanding of the SOM‐N components (metabolites) intrinsic to the mineralization process are required.…”

Influence of Composted Dairy Manure and Perennial Forage on Soil Carbon and Nitrogen Fractions during Transition into Organic Management

“…Net N mineralization (N min ) represents the amount of N that can be mineralized within a defined period of time under specific incubation conditions [14,39]. In this study, the N min represents the easily degradable N sources, which are considered part of the active N fraction because of the short-term incubation (28 days).…”