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100 square feet agricultural Albrecht amount analysis anions balance boron calcareous soils calcium saturation cation exchange capacity chemical clay compost heap concentration contains copper crops decompose disease dissolved dolomite extraction farm farmers foliar feed food garden free lime furrowslice acre garden soil garden writers grams grass grow gypsum heavy soil home gardeners humus inches irrigation J.I. Rodale layer lb/ac leached light soil magnesium manganese manganese sulfate manure materials minerals nitrate nitrogen nutrientdense food nutrition oilseedmeal Organic Gardening organic matter level phosphorus plant nutrients potassium pounds per acre produce protein quantities quarts release remineralization result rock phosphate Rodale salt sample seed seedmeal sodium soil analyst soil audit soil ecology soil fertility soil organic matter soil pH soil solution soil test soil’s spread starting volume subsoil sulfate sulfur Target Level TCEC there’s topsoil usually vegetables waste year’s zinc zinc sulfate