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Summary An investigation was carried out in order to study the effect of salts namely NaC1 and Na2SO 4 on the rate of translocation of photosynthates in pigeonpea, at the pod filling stage. At the concentration of 10 EC NaC 1 only 17% of the ~4C assimilates are translocated from the source leaf to the other parts of the plant. Out of this pods receive about 8%. On the other hand even at a concentration of 15 EC Na2SO 4 about 30% of the total ~ 4C assimilates get translocated and out of this pods receive about 12%. From this it may be concluded that under salt-stress conditions the rate of translocation of photosynthates is adversely affected and between the two salts, NaCI was discovered to have a marked inhibitory effect. IntroductionCrop yield is influenced by a number of factors. Among them photosynthetic efficiency and the rate of translocation of photosynthates are of great importance. Recently Cheema and Pandeyl have carried out translocation studies in pigeonpea under normal field conditions and have shown that there is a correlation between the rate of translocation of photosynthates and yield. Indian Agriculture is facing the threat of salinity problem due to ill managed irrigation and excessive application of synthetic fertilizers.~ 5 In general salt rich environment adversely affects growth and yield of crop plants 3.6.7.9. ~o. It is noted that salt tolerance capacity varies with the plant as well as