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Bray’s Mobility Concept

Bray’s Mobility Concept. Immobile Nutrients. Mobile Nutrients. Indicators: Biomass (% coverage) Color (concentration). Indicators: Biomass (% coverage) Color (concentration. Nutrient Uptake: Dependent on growth stage Dependent on environment Response depends on reservoir.

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Bray’s Mobility Concept

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  1. Bray’s Mobility Concept Immobile Nutrients Mobile Nutrients • Indicators: • Biomass (% coverage) • Color (concentration) • Indicators: • Biomass (% coverage) • Color (concentration • Nutrient Uptake: • Dependent on growth stage • Dependent on environment • Response depends on reservoir • Nutrient Uptake: • Independent of growth stage • Independent of environment • Response does not depend on reservoir Root System Sorption Zone Root Surface Sorption Zone Sufficiency cannot be used for mobile nutrients due to the fact that a soil test indicates the total amount available within the profile, not within the root system sorption zone. Sufficiency can be used for immobile nutrients because roots expand within the profile, therefore, the same amount will be available as immobile nutrients are taken up via contact exchange. Adapted from Raun by Tracy Wilson and Alex Cumbie, 2012

  2. Bray’s Mobility Concept Mobile Nutrients Immobile Nutrients • Indicators: • Biomass • Color • Concentration • Indicators: • Biomass • Color • Nutrient Uptake: • Dependent on growth stage • Dependent on environment • Response depends on reservoir • Nutrient Uptake: • Independent of growth stage • Independent of environment • Response does not depend on reservoir Root System Sorption Zone Root Surface Sorption Zone Sufficiency can be used for immobile nutrients because roots expand within the profile, therefore, the same amount will be available as immobile nutrients are taken up via contact exchange. Sufficiency cannot be used for mobile nutrients due to the fact that a soil test indicates the total amount available within the profile, not within the root system sorption zone.

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