The effect of alteration in source through defoliation or shading or the sink through deflowering on yield and associated parameters was studied on black gram cv. T9. The data indicated greater source below six node helps in better nodulation and N content, while the leaves above seventh node influence pod yield. Deflowering revealed that there was competition for assimilates between growth of nodules and developing pods. The decrease in yield under low light was due to a decrease in DMP due to poor photosynthesis. The investigation suggests existence of possible limitation of source in determining the yield of black gram.
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