A method for assessing intercepted radiation by a crop with a low leaf area: an application to oilseed rape | Une méthode pour estimer l'interception du rayonnement par un couvert bas: application au colza avant montaison
2002
Denoroy, P. ((Institut National de la Recherche Agronomique, Thiverval-Grignon (France). Centre de Versailles Grignon, Bioclimatologie)) | Thiebeau, P. | Gosse, G.
Calculation of photosynthetically active radiation interception by a crop with a low leaf area index, particularly when the canopy is not closed, needs a more detailled approach than a simple Beer's law with constant light extinction coefficient (k). This paper introduces a simple procedure for the calculation of intercepted radiation, taking into account the ground cover ratio, and using a small set of parameters. The k coefficient is deduced from this calculation and we show that k depends on the leaf area index, the location and the season. The significance of introducing ground cover ratio in the calculation of intercepted radiation is estimated, and sensitivity of the method to various parameters is assessed
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