Abstract
The effects of soil-water potential, temperature, and visible irradiance interactions on net photo synthetic and dark respiration rates of Pennisetum purpureum Schumach., a tropical C4 grass and Calopogonium mucunoides Desv., a C3 leguminous herb were studied. The net photosynthetic rates of the two species decreased with decreasing soil water potential and at all levels of irradiance considered. Similarly, the net photosynthetic rates of the two species decreased as soil water potential decreased at all temperatures. The C4 species reached light saturation at very high irradiance whereas the light saturation of the C3 species occurred at relatively low irradiance at high temperatures and low soil water potential. The dark respiration rates decreased with decreasing soil water potential and increased as temperature increased from 20 °C to 40 °C.
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