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 10 benchmarks together — the OptimalRange form drives the primary score, while 9 guard(s) constrain the result.
Evidence & Context
Based on typical relationships between mineral and total N, a total N level below 500 mg/kg in the topsoil is considered critically low for sustainable cropping in this biome.
Total soil nitrogen level in the topsoil below which ecosystem function is compromised and degradation occurs.
Critical lower threshold for total soil nitrogen in mg/kg below which sustainable cropping is compromised in this biome.
This threshold is based on agronomic studies and typical relationships between mineral and total nitrogen indicating degradation below this level.
Sources (1)
Critical concentrations for nitrogen, phosphorus, potassium and sulphur soil tests for break crops - Grains Research and Development Corporation (GRDC)
View SourceSupporting Sources (3)
Additional references from the underlying research that informed this benchmark.
Regenerative agriculture — the practices involved and its position within modern agricultural systems
View SourceSoil | Australia state of the environment 2021
View SourceSoil and Landscape Grid National Soil Attribute Maps - Total Nitrogen (3" resolution) - Release 2
View Source