The Washington State legislature passed a bill this spring, to become effective on June 11, 1998, that formally adopts Canada's standards for allowable levels of nonnutritive substances in commercial fertilizers. Commercial fertilizers are defined as "a substance containing one or more recognized plant nutrients and that is used for its plant nutrient content or that is designated for use or claimed to have value in promoting plant growth, and shall include limes, gypsum and manipulated animal and vegetable manures. It does not include unmanipulated animal and vegetable manures, organic waste-derived material and other products exempted by the department by rule."
The purpose of …
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