Inclusion of this factor into the model increased accuracy of root depth simulations from R2 of 0.65 to 0.97 and reduced root mean square error from 45 to 9 cm.
Below that threshold, root growth linearly decreases to zero at saturation. Analysis indicated that unconstrained root growth occurs until volumetric soil moisture approaches 0.03 mm/mm below saturation. We used data from a controlled experiment (Rhizotron facilities) that included root depth observations for nine WT treatments to develop and calibrate the new model. We enhanced the APSIM-soybean model to accurately simulate root depth in fields with shallow water tables. Shallow water table (WT) influences crop growth and production in many major agricultural regions across the globe.
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