With the help of LI-6400 portable photosynthesis analyzer, we investigated the diurnal changes of photosynthetic rate and environmental effect in Xinong NO.2 Job s-tears (Coix lacryma-jobi) at the jointing stage. A net photosynthetic rate (NPR) within the range of 10.4~29.8μmol/(m2·s) was observed. The net photosynthetic rate, stomatal conductance and transpiration rate showed a single peak curve pattern with no pronounced decline at noon. A peak value of NPR occurred at 11:00 h and the average photosynthet...
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