A general law for direct sunlight penetration Academic Article uri icon


  • Under the assumption that foliage area distributions may be adequately approximated by probability distributions, a general law for the prediction of direct sunlight penetration of crop canopies is derived. It is shown that the Poisson (Beer's) law is a special case of this more general law. Area and transect problems are treated, and stochastic variation in leaf sizes is considered. Numerical studies are presented which indicate that the Poisson law is not adequate in all cases for the prediction of sunlight penetration and that stochastic variation in leaf sizes is of less consequence than average leaf size and/or leaf-area index. 1977.

published proceedings

  • Mathematical Biosciences

author list (cited authors)

  • Mann, J. E., Curry, G. L., Hartfiel, D. J., & Demichele, D. W.

citation count

  • 23

complete list of authors

  • Mann, JE||Curry, GL||Hartfiel, DJ||Demichele, DW

publication date

  • January 1977