Photosynthetic rate ( P n ) of plants is simultaneously affected by photosynthetically active radiation ( PAR ) and maximum yield of primary photochemistry ( F v / F m ). In order to explore the quantitative relationship between P n , PAR and F v / F m , those parameters were simultaneously measured for different plant species (maize, sunflower, daylily and alfalfa), growth stages and irrigation treatments. Results indicated that the diurnal variation of P n had no significant correlation with that of F v / F m . Mean diurnal values of P n were linearly correlated with those of F v / F m among the different irrigation treatments of alfalfa ( p < 0.05), but this linear correlation was not observed among the different species. There was a positive relationship between P n and F v / F m only at midday (12:00 and 14:00) ( p < 0.01). A significant linear relationship was observed between the diurnal variation of P n and PAR × F v / F m ( p < 0.05), this law was suitable for the different species, and the different growth stages and the different irrigation treatments of the same species. This study confirms that P n is significantly related to the photochemical energy ( PAR × F v / F m ), the light energy directly used in photochemical reactions of plants.
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