100#/ac max.
Yes, brown coal (lignite) is a primary source of humates, but it is not technically a humate itself until processed. It acts as a rich, natural source of humic substances (humic and fulvic acids) that are extracted via alkaline treatment to create agricultural-grade humates.
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Key Details regarding Brown Coal and Humates:
Definition: Humates are the salt forms of humic acid derived from materials like leonardite or brown coal.
Source Material: High-quality brown coal/lignite is mined to produce commercial humates.
Transformation: While raw brown coal contains these substances, it is often processed to increase the concentration of soluble humic acids.
Agriculture Use: Brown coal-derived humates are used as soil conditioners to improve water retention, cation exchange capacity (CEC), and nutrient uptake.📷New Mexico Geological Society 6
In summary, brown coal is the raw material from which commercial humates are extracted, often described as a "humate-rich" resource.