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The dry line of products branded SOURCE™ and the liquid products, Humi-Source Plus™ and Source-Ful™ are leonardite based humates. Made from North Dakota Leonardite, a form of natural of humates, these products will help relieve plant stress whether it is applies as a soil amendment of mixed with fertilizer.

The natural bio-stimulants found in the SOURCE™ dry line of products, Humi-Source Plus™ and Source-Ful™ improve the availability of nutrients in the soil. The soils nutrient holding capacity is increased as well as the water holding capacity. The workability of problem soils is improved: week area in a field become less noticeable.

The dry line of products SOURCE™ and the liquid products, Humi-Source Plus™ and Source-Ful™ enhance any crops ability to absorb in marginal soils, resulting in faster growth and higher yields.

The Humic Products Trade Association has published HPTA Label Claims for humates with resources.

Click on logos for more information

The Source North Dakota Leonardite
Humi Source Plus - Soluble Humic Acid
Source Ful - Liquid Fulvic Acid


Leonardite Products has not yet certified their products as organic, yet many of our customers have. Both Source and Humi-Source line of products are certifiable.

Click here to learn about the organic nature of the Source line of dry humates.

Humi-Source Plus Organic (PDF)

HPTA Label Claims (PDF)
Working the Land
Healthy Crop
Preparing the Land