Rhizos: A Simulation of Root Growth and Soil Processes. Sensitivity Analysis and Validation for Cotton

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Abstract
A sensitivity analysis of a computer simulation of two-dimensional root, water and nitrate distributions in the soil and uptake by the plants showed that the model is more sensitive to selected environmental parameters than to plant parameters. Among the latter, the effect of the time period during which a root unit is taking up water and nitrate at a maximum efficiency is the great-est. Among the environmental factors, the sensitivity of the model is greatest for variations in maximum and minimum daily temperatures. To evaluate the model, simulated and experimental results of cotton root and water content distributions in the soil during the growth period were compared. The model can reasonably predict root and water distribu-tions in the soil under various conditions normally prevailing in the field.

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