Potassium Cycle Animal Manures Plant Uptake K Fertilizer Crop Residues Soil Solution K+ Mass Flow Diffusion Plant Uptake Crop Residues K Fertilizer Leaching (K+) in soils with low CEC. Microbial Pool Soil Organic Matter Animal Manures Nonexchangeable K Micaceous clay minerals (illite, vermiculite, chlorite) Potassic micas (biotite, phlogopite, muscovite) Potassic Feldspars (K released by lattice destruction) Exchangeable K Slow Exchange Weathering Slow Exchange Very Fixation Rapid Release Potassium Cycle

Authors: Todd Heap and Matt Barnes The Potassium Cycle Animal Manures Plant Uptake K Fertilizer Crop Residues Nonexchangeable K Slow Exchange Diffusion Mass Flow Micaceous clay minerals (illite, vermiculite, chlorite) Fixation Rapid Release Weathering Soil Organic Matter Soil Solution K+ Slow Exchange Microbial Pool Potassic micas (biotite, phlogopite, muscovite) Exchangeable K Weathering Slow Exchange Very Potassic Feldspars (K released by lattice destruction) Leaching (K+) in soils with low CEC.