About this item Pulverized leonardite powder is a biochemically active concentrated source of humic acids containing 70% humic acid (by weight). Naturally-occurring, unaltered oxidized lignite is pulverized to a particle size 90% less than 30 mesh. This powder is an organic material which is added to your soil to enhance uptake of nutrients, increase microbial activity and stimulate soil life, and can be used as a supplemental source of trace elements. Can be applied to all crops and compost. Apply using 75-150 lbs. per acre or 1-10 lbs. per 100 sq. ft., broadcast in fall, post-harvest or early spring, either pre-plant or with seed. Incorporating into the soil is not required.