Figure 4: Measured sugarbeet Leaf Area Indexes (LAI) and Root Lengths (RL), as functions of the crop development stages (DVS). The continuous and dashed line shows the respective SWAP original functions (after Utset et al. 2007b).

Figure 5 compares the experimentally-measured sugarbeet root-lengths with those originally considered in SWAP as functions of the crop development stages. The SWAP function might slightly underestimate the sugarbeet root development as grown under Mediterranean conditions. However, the measured values behave in a way that is similar to the original SWAP function. Furthermore, there is a considerable dispersion of the measured values, which can be due to the different soil types considered.

♦ Measured LAI -SWAP LAI a Measured RL----SWAP RL

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