Leonardite

Leonardite was named after A. G. Leonard, first director of the North Dakota Geological Survey, in recognition of his valuable work on these deposits.  Leonardite is a soft, dark colored, vitreous mineraloid that contains high concentrations of the active humic acid (>65%) and fulvic acid (≈4%).  Leonardite is an oxidation product of lignite coal and mined from near surface pits.

The commercial applications of leonardite are driven by the utilization of the humic acid and fulvic acid constituents.  Significant market applications of leonardite are in the oil well drilling industry, agricultural applications as plant growth aid and soil conditioner, and clay dispersant in the metalcasting industry.  Additional specialty applications include remediation of soil contamination and water treatment.

Chemical characterization of leonardite and its potential use as a soil conditioner for plant growth enhancement

A Premium granular Leonardite used as a soil conditioner and fertiliser additive, containing 70% humic acid. Agri-Plus has perhaps the highest concentration of both humic and fulvic acids available.

Agri-Plus™ is a concentrated, dry granular soluble humus formulation with a 30-year track record for performance and ease of use.  Containing abundant concentrations of plant active humic substances, Agri-Plus™ reputation for consistent results has made it the standard to which all humic products are compared. Agri-Plus™ is compatible with all dry fertilizers, including urea containing blends.

Benefits:

• Concentrated for convenience and cost savings
• Lower application rates with greater effectiveness as compared to other dry granular humic products
• Improved nutrient availability to plants
• Blend with dry fertilizers or apply as standalone application

Soil structure improvements:

• Increases nutrient retention in fast draining soils
• Aggregates soil particles for improved drainage and stability
• Buffers sodic or saline soil conditions reducing yield drag

Usage	Recommended application rate
Soil conditioner	4-12 grams / m2 40-120 kg / Ha
Turf & Lawn	4-12 grams / m2 40-120 Kg / Ha
Potting mix additive/conditioner	0.5-1.5kg / m3 5-15 Kg / 10m3
Fertiliser additive	Add at 2-5% of total mix (mix well before applying)

Typical Data – Random Sample

Element/Chemical Analysis               As Received

Nitrogen                                                     1.04 %
Phosphate (P2O5)                                 < 0.10 %
Potash (K2O)                                          < 0.10 %
Boron                                                             59 ppm
Sulfur                                                          1.04 %
Magnesium                                                0.03 %
Sodium                                                       0.04 %
Iron                                                           6,740 ppm
Calcium                                                      0.22 %
Manganese                                             < 20.0 ppm
Zinc                                                                 36 ppm
Copper                                                    < 20.0 ppm
pH                                                                 2.8

Testing conducted by Midwest Laboratories, Omaha NE (USA), February 2011

All information offered is typical and neither states nor implies any guarantee.
Data contained herein is accurate and complete as can be determined at the time of this printing.
Any liability incurred with use of this data or the product names is disclaimed by us.