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Leaf length per leaf rank on the main stem of Brassica nigra grown in three densities in the field (A) and simulated with the model (B). The high (25 plants m–2) and low densities (1 plant m–2) have been used for model calibration, while the middle density (4 plants m–2) served as validation. Up to leaf rank 25 is shown as not all plants produce enough phytomers to have leaves of higher ranks along the main stem.
