/// <summary>Set this root organ's biomass state.</summary>
/// <param name="rootWt">The DM amount of root biomass (kg/ha).</param>
/// <param name="rootN">The amount of N in root biomass (kg/ha).</param>
/// <param name="rootDepth">The depth of root zone (mm).</param>
public void SetBiomassState(double rootWt, double rootN, double rootDepth)
{
Depth = rootDepth;
CalculateRootZoneBottomLayer();
var rootBiomassWt = MathUtilities.Multiply_Value(CurrentRootDistributionTarget(), rootWt);
var rootBiomassN = MathUtilities.Multiply_Value(rootBiomassWt, MathUtilities.Divide(rootN, rootWt, 0.0, Epsilon));
Live.SetBiomass(rootBiomassWt, rootBiomassN);
var blankArray = MathUtilities.Multiply_Value(CurrentRootDistributionTarget(), 0.0);
Dead.SetBiomass(blankArray, blankArray); // assumes there's no dead material
}