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Influence of the diffuse proportion of solar radiation on the simulation of gross assimilation and dry matter production in leaf canopies is evaluated under different climatic conditions. Four methods to estimate daily and hourly values of direct and diffuse radiation from measurements of global radiation are compared both in terms of accuracy of incoming solar component estimates and of their suitability for incorporation into 2 wheat growth-simulation models (NWHEAT and SUCROS 90). Comparison showed that ( l ) the accuracy of direct and diffuse component estimates tends to decrease with increasing temporal resolution and varies under different climatic conditions and (2) the final grain yield calculated by the models is slightly but significantly influenced by the method used to calculate the components of incoming radiation.

Different methods for separating diffuse and direct components of solar radiation and their application in crop growth models