Modeling crop root growth and function.

Publisher Summary Many crop growth models that quantify plant uptake of water and solutes from soils require a quantitative description of the root system and its location in the soil profile. This chapter proposes root growth models for crop growth simulations. Root modeling involved the partitioning of carbohydrates to create belowground biomass. Different approaches are discussed in the chapter, which have been taken by modelers to illustrate the usefulness of each approach. The model contains no restrictions to root growth from stresses, and it assumes different rates of elongation, lineal densities, and diameters for vertical axes, first-order laterals, and higher-order laterals. Several concepts from this model were incorporated into a root mapping model for fibrous root systems. Further, potential reductions are calculated daily for impacts of unfavorable soil temperature and oxygen partial pressures. Then the most limiting of these potential reductions is used to calculate the rate of change of root dry weight in each cell.

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