Validation of a three-dimensional solar radiation interception model for tree crops

▶ A three-dimensional solar radiation interception model was validated for a wide range of canopies, planting pattern and leaf area density. ▶ Tube solarimeters placed along and across the row were used for below-canopy solar irradiance measurements. The measurement points and data considered were more than previous studies. ▶ Model-estimated solar irradiance transmittances were in good agreement with measurements. ▶ Agreements between model-estimations and measurements were influenced by distance and direction from tree trunk, sky conditions, canopy symmetry, stand uniformity and leaf distribution.