The Soil Phosphorus Cycle

Nitrogen and phosphorus are the elements that most often limit biological productivity. While the major source of N is atmospherically derived, P is primarily

Aerobic respiration O2 reduction

Aerobic respiration O2 reduction

Plant residues Organic wastes

Faculative anaerobic respiration

Plant residues Organic wastes

reduction

Zone I Zone II & Zone III

Organic matter

Zone III

Fe3+ reduction

Anaerobic respiration Zone IV

Surface reduction Eh = -200 to -100 mV

Zone V

Easily decomposible

Zone I Zone II & Zone III

Organic Gardeners Composting

Organic Gardeners Composting

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