Article

A flexible and explanatory model of light distribution and photosynthesis in row crops

Centre for Agrobiological Research, P.O. Box 14, 6700 AA Wageningen The Netherlands; Department of Theoretical Production Ecology, Agricultural University Wageningen, P.O. Box 430, 6700 AK Wageningen The Netherlands
Agricultural and Forest Meteorology DOI:10.1016/0168-1923(89)90004-X pp.1-20

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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Keywords

closed canopy
 
different row geometries
 
Diffuse
 
diffuse light
 
direct light distribution
 
diurnal curve
 
hedgerow crop
 
homogeneous field crop
 
leaf angle distributions
 
leaf area density
 
Leaf photosynthesis
 
simulation results
 
special geometric situation
 
vertical leaf area density distributions