Abstract
A model for gross photosynthesis of a hedgerow crop was developed. Diffuse and direct light distribution and absorption were calculated by taking account of scattering and reflection. Leaf photosynthesis was calculated from absorbed light and integrated over the row. The model can describe different row geometries, vertical leaf area density distributions and leaf angle distributions. For path widths <30% of the row height, simulation results showed that light absorption and crop photosynthesis under diffuse light are little reduced compared with a closed canopy. The effect of the vertical distribution of the leaf area density on row crop photosynthesis was small. The edge effect in a homogeneous field crop was studied as a special geometric situation. Daily totals of row crop photosynthesis were found by integration over the diurnal curve and were calculated for different latitudes.
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