Source and sink relationship in mungbean var. PS-16 was analysed using source and sink alteration technique. Effect of source and sink variation on photosynthesis, nodulation, leaf nitrogen and chlorophyll content was examined in relation to growth and yield characters. The data indicated the possible limitation of source in determining the sink yield in mungbean var. PS-16. It appeared however, that sink itself was instrumental in hastening the decrease in photosynthesis and leaf senescence by affecting directly mobilisation and utilisation of leaf nitrogen and indirectly nodulation.
