Genotypic differences in photosynthesis and its associated parameters in relation to yield among barnyard millet (Echinochloa frumentacea) genotypes under rainfed condition in hills

A field experiment with twelve genotypes of barnyard millet (Echinochloa fr umentacea (Roxb.) Link) was conducted during 1997-98 under rainfed conditio n in hills to understand the photosynthetic basis of yield. A significant g enotypic variations in rates of photosynthesis and its associated parameter s was recorded during vegetative and reproductive phases. Mean rates of lea f photosynthesis, canopy photosynthesis, transpiration, stomatal conductanc e, leaf temperature depression and total dry-matter had significant positiv e association with grain yield, whereas the association of plant height, ha rvest index and test weight with yield was not significant. Mean photosynth esis rate showed positive association with harvest index and test weight. T iller number/plant had poor negative association with grain yield.