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SUMMARYA model describing the response of canopy net photosynthesis by isolated blocks and rows of chrysanthemum plants to incident light flux density is reported. The model combines a description of the light environment within an isolated array of plants with a description of the response of leaf net photosynthesis to light flux density.The leaf parameters in the model were estimated by analysis of data for the response of canopy net photosynthesis by a closed crop of chrysanthemum plants to incident light flux density at two carbon dioxide concentrations. These leaf parameter values were then used to simulate the response of canopy net photosynthesis to incident light flux density by an isolated block and double row of chrysanthemum plants. The simulated responses were found to be in close agreement with the measured responses.

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