Abstract
Nutrients commonly limit plant growth in terrestrial ecosystems, but nutrient uptake and plant growth are not usually related to total nutrient content of soil. Mineral nutrition of plants depends on size of the available nutrient pool; concentration in soil solution that the available pool can maintain; transport characteristics of the soil; density, geometry and uptake mechanisms of roots; and plant-water relations. Complexity of biological and physico-chemical interactions and sampling difficulties constrain empirical studies of these phenomena. Dynamic simulation models are proposed as tools for overcoming these constraints and for generating pertinent hypotheses that can be evaluated empirically. Water and nutrient uptake models are discussed and applications are demonstrated by examples.
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