I am aware that CERES wheat converts inputs of solar radiation to Photosynthetically active radiation (PPFD) by multiplyinhg the radiation values by the constant 0.5 assuming that 50% of the incoming solar radiation is in the photsynthetically active range. Does anyone know how CROPGRO model does this?
Tesfalidet A. Ghebreab
University of Natal
School of Applied Environmental Sciences
Department of Soil Science and Agrometeorology
Post bag 3210
South Africa