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Quantification of the contributing factors to crop photosynthesis enhancement over a designated growing period (1 April to 1 October 2011) in the 71 % haze treatment. The x-axis represents the factors which have an influence: PPFD(H), horizontal PPFD distribution; Photo., leaf photosynthesis light response curve; PPFD(V), vertical PPFD distribution; LAI, leaf area index; Interaction, interaction effect of the four factors.
