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  • A home gardener's guide to soils and fertilizers 

    Cogger, Craig George, 1950- (Pullman, Washington : Washington State University Extension, 2020-01)
    Soil is a mixture of weathered rock fragments and organic matter at the earth’s surface. It is biologically active—a home to countless microorganisms, invertebrates, and plant roots. It varies in depth from a few inches ...