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Availability Increases with increasing pH and soil moisture

Molybdenum Cycle. Plant uptake: Nitrate Reductase (NO 3 - to NO 2 - ), Fixation of N 2 by Nitrogenase. Animals (Toxicity in forage at levels > 5 ppm). Plant residue. Crop removal. Availability Increases with increasing pH and soil moisture. MoO 4 2-. Coal combustion. Man.

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Availability Increases with increasing pH and soil moisture

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  1. Molybdenum Cycle Plant uptake: Nitrate Reductase (NO3-to NO2-), Fixation of N2 by Nitrogenase Animals (Toxicity in forage at levels > 5 ppm) Plant residue Crop removal Availability Increases with increasing pH and soil moisture MoO42- Coal combustion Man Mass flow or diffusion Organic matter Sewage sludge mineralization immobilization Steel industry Soil Solution Dominant Species : MoO42-, HMoO4-, H2MoO40 pH > 4 : MoO42-, HMoO4- pH < 4 : H2MoO4, MoO22+ Mining Mo Fertilizers: Na2MoO4 (39%) (NH4)2Mo2O7 (54%) MoO3 (66%) MoS2 (60%) Parent Material Igneous rocks- Feldspar and ferromagnesian minerals- Sedimentary rocks weathering precip. dissolution Adsorption: Fe and Al oxides at low pH Precipitated forms: Fe2(MoO4)3 PbMoO4 CaMoO4

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