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acid acre aeration aerobic Agricultural Experiment Station amount anaerobic animal applied ashes bacteria beds bone meal carbon cent chemical fertilizers compost heap compost material compost pile composting process contains corn cottonseed meal cover crop decay decomposed decomposition deficiency digestion disease dried earth earthworms farm farmers feed feet finished compost fungi garbage green manure ground growing growth humus inches land lawn layer leaf mold leaves legume lignin lime loam microorganisms minerals mixed mixture moisture mulch municipal nitrogen nutrients odor organic fertilizer organic gardener organic matter oxygen peat phosphate phosphoric acid phosphorus plow potash potatoes poultry pounds present protein refuse residues rich rock roots rotary rotary tiller sawdust seed sewage sheet composting shredded Sir Albert Howard sludge spring straw supply surface temperature tion tons trace elements trees turned vegetable wastes weeds winter wood worms