The following words or terms shall have the meaning set forth herein when used in these rules and regulations:

"Aged" means exposed to weathering or natural decay.

“Beneficial substances” means any substance or compound, other than primary, secondary, and micro plant nutrients, and excluding pesticides, that can be demonstrated by scientific research to be beneficial to one or more species of plants, soil or media, and shall be considered a soil amendment for the purposes of this chapter.

"Biosolid" means a primary organic solid material produced by wastewater treatment processes that can be beneficially recycled for its plant nutrient content and soil amending characteristics, as regulated pursuant to 40 CFR 503, as amended.

"Brand" or "product name" means a specific designation applied to an individual soil amendment.

"Compost" means a biologically stable material derived from the composting process.

"Composting" means the biological decomposition of organic matter accomplished by mixing and piling in such a way to promote aerobic or anaerobic decay and inhibits pathogens, viable weed seeds and odors.

"Custom media" means a horticultural growing medium that is prepared to exact specifications of the person utilizing the medium.

"Forest products" means untreated wood and its untreated byproducts generated from the harvest of timber and includes but is not limited to lumber, sawdust, bark, and similar materials, but in no case shall include reprocessed wood from fabicated consumer or industrial products.

"Horticultural growing media" means any substance or mixture of substances promoted as or is intended to function as a growing medium for the managed growth of horticultural crops in containers and shall be considered a soil amendment for the purposes of this chapter.

"Inorganic based" means to all substances that do not fall under the definition of organic based or microbial based.

"Landscape materials" means green waste derived from landscape operations and includes but is not limited to grass clippings, plants, shrubs, and tree trimmings not more than six inches (6") in diameter.

"Microbial based" means a biological substance or mixture of substances distributed to be applied to the soil, plants, or seeds for corrective soil purposes; intended to improve germination, growth yield, product quality, reproduction, flavor, or other desirable characteristics of plants; or intended to produce any chemical, biochemical, biological, or physical change in the soil.

"Mulch" means any organic or inorganic soil surface cover used to help retain moisture longer in the soil by retarding evaporation, to discourage weed growth, to help maintain a constant temperature by insulating the soil, to discourage runoff and soil erosion by shielding the soil surface from water abrasion or to promote water absorption and retention.

"Organic based" means only naturally occurring substances generally recognized as the hydrogen compounds of carbon and their derivatives.

“Plant Biostimulant” means a substance(s), microorganism(s), or mixtures thereof, that, when applied to seeds, plants, the rhizosphere, soil or other growth media, act to support a plant’s natural nutrition processes independently of the biostimulant’s nutrient content. The plant biostimulant thereby improves nutrient availability, uptake, or use efficiency, tolerance to abiotic stress, and consequent growth, development, quality or yield, and shall be considered a soil amendment for the purposes of this chapter.

"Processed" means deliberately treated or manipulated to modify or transform physical, chemical, or biological characteristics of the natural state of the substance.

"Raw" means in the natural state, and not prepared, modified or manipulated for use.

"Registration document" means the information required by the Board for registering a soil amendment for distribution into or within Oklahoma. The Registration Document may be made available by the registrant to the purchaser upon request, but shall not be part of the product label or labeling.

"Wood" means a hard, fibrous material located beneath the bark, which constitutes the greatest part of the stems of trees and shrubs.

Added at 22 Ok Reg 702, eff 5-12-05

Amended at 42 Ok Reg, Number 20, effective 7-11-25