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...Agricultural systems evaluating biological productivity in intercropping with production possibility curves radha ranganathan marcel fafchamps thomas s walker international crops research institute for the semi arid tropics icrisat pantancheru andhra pradesh india received march accepted october abstract drawing on notion of from economics literature an analytical procedure trade offs experiments is presented yield between species are evaluated by plotting normalised yields two competing a graph resulting shape curve passing through scatter mean treatment observations indicates nature relationship complementary if convex competitive concave and independent or one where ability both same estimated straight line sole crop global index defined as ratio area under to joining computation described over range situations its implications experimental extension discussed proposed similar lancl equivalent ler interpretation but overcomes some weaknesses introduction most often summarised land r...