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 for topsoil (0–10 cm) is identified at approximately 1450 mg/kg, below which the soil's capacity to accumulate and stabilize organic carbon is significantly constrained.
Lower critical threshold of total soil nitrogen in the top 10 cm below which ecosystem function is impaired.
This benchmark defines the minimum total soil nitrogen level in topsoil below which soil organic carbon accumulation and ecosystem function are impaired.
Based on a landmark study identifying depth-specific TN thresholds that constrain soil carbon accumulation.
Sources (1)
Total nitrogen levels as a key constraint on soil organic carbon ...
View SourceSupporting Sources (2)
Additional references from the underlying research that informed this benchmark.
Regenerative opportunities for building soil biological resilience – a case study in the low-rainfall zone in Southern Australia - GRDC
View SourceNitrogen Fixation in Acacias - AgEcon Search, accessed July 30, 2025,
View Source