Soil Nitrogen
Benchmark Value
Scoring Curve
This curve shows how a field measurement for this indicator would score across all available benchmark forms in this context. The scoring engine uses 7 benchmarks together — the OptimalRange form drives the primary score, while 6 guard(s) constrain the result.
Contributing Benchmarks
Evidence & Context
A lower critical threshold is proposed in the range of <500 to 700 mg/kg total N (topsoil). Levels below this are likely to signify compromised ecosystem function and unsustainable agricultural productivity without significant intervention.
Lower critical threshold for total soil nitrogen concentration in topsoil below which ecosystem function and agricultural productivity are compromised.
This benchmark defines a critical lower threshold for total soil nitrogen concentration in topsoil below which ecosystem function and agricultural productivity are likely compromised in Tropical Monsoonal Savannas under agricultural crop production.
Based on literature indicating that levels below 500-700 mg/kg total N impair ecosystem function and crop productivity in tropical monsoonal savanna agricultural soils.
Sources (1)
Effect of fire and tree‐grass patches on soil nitrogen in Australian tropical savannas
View SourceSupporting Sources (5)
Additional references from the underlying research that informed this benchmark.
Comparison of legume-based cropping systems at Warra, Queensland. I. Soil nitrogen and organic carbon accretion and potentially mineralisable nitrogen.
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Review of C:N Ratios in Vegetation, Litter and Soil ... - DCCEEW
View SourceNitrogen Fixation in Acacias - AgEcon Search, accessed July 30, 2025,
View SourceSoil organic carbon and total nitrogen under Leucaena ..., accessed May 11, 2025,
View SourceSoil organic carbon and total nitrogen under Leucaena leucocephala pastures in Queensland
View Source