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ESTIMATING POTENTIALLY MINERALIZABLE SOIL NITROGEN FROM A CHEMICAL INDEX OF SOIL NITROGEN AVAILABILITY1

George Stanford, Stuart J. Smith

Open publisher page 60 citations

Abstract

The feasibility of estimating potentially mineralizable soil nitrogen, N0, from direct on indirect measurements of NH4+–N produced by hydrolysis of soil organic nitrogen during 16-hr autoclaving (121°C), Ni, was investigated for 13 groups of soils comprising 475 surface and subsurface samples representing 54 soil types. The regressions of N0 on Ni for different soil groups were pooled, and the resulting equation was N0 = 4.1 (±1.0) Ni + 6.6. Apparently, therefore, the coefficient, 4.1, provides a means of reasonably estimating N0 from the chemical index, Ni, for a broad range of soils, with certain specified exceptions. Estimates of N0 from Ni together with measurements of residual mineral, plant-available N may provide a basis for developing improved N fertilizer recommendations.

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What this paper is about

The feasibility of estimating potentially mineralizable soil nitrogen, N0, from direct on indirect measurements of NH4+–N produced by hydrolysis of soil organic nitrogen during 16-hr autoclaving (121°C), Ni, was investigated for 13 groups of soils comprising 475 surface and subsurface samples representing 54 soil types. The regressions of N0 on Ni for different soil groups were pooled, and the resulting equation was N0 = 4.1 (±1.0) Ni + 6.6. Apparently, therefore, the coefficient, 4.1, provides a means of reasonably estimating N0 from the chemical index, Ni, for a broad range of soils, with certain specified exceptions. Estimates of N0 from Ni together with measurements of residual mineral, plant-available N may provide a basis for developing improved N fertilizer recommendations.

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Available abstract

The feasibility of estimating potentially mineralizable soil nitrogen, N0, from direct on indirect measurements of NH4+–N produced by hydrolysis of soil organic nitrogen during 16-hr autoclaving (121°C), Ni, was investigated for 13 groups of soils comprising 475 surface and subsurface samples representing 54 soil types. The regressions of N0 on Ni for different soil groups were pooled, and the resulting equation was N0 = 4.1 (±1.0) Ni + 6.6. Apparently, therefore, the coefficient, 4.1, provides a means of reasonably estimating N0 from the chemical index, Ni, for a broad range of soils, with certain specified exceptions. Estimates of N0 from Ni together with measurements of residual mineral, plant-available N may provide a basis for developing improved N fertilizer recommendations.

Key concepts: Nitrogen, Soil water, Environmental chemistry, Soil science, Soil test, Fertilizer, Environmental science, Residual

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ESTIMATING POTENTIALLY MINERALIZABLE SOIL NITROGEN FROM A CHEMICAL INDEX OF SOIL NITROGEN AVAILABILITY1 — Research Paper | ScholarLens