The fitting coefficients to relate nutrients relative absorption and relative biomass in seven different vegetable and fruit crops were determined, using the potential M·MT-1 = MO (B·BT-1 ) bequation where M= nutrient amount in the crop biomass, B; MT= total nutrients contained in the total biomass, BT; MO= normalization constant, b = allometric exponent. Nutrients absorption and biomass data of different previously published experiments were examined. The fitting goodness indicators showed that this function related both variables satisfactorily. In the different cases, the absolute sum of squares varied between 0.0009 y 0.084, and the standard deviation of residues varied between 0.008 y 0.2 over the adjustment of relative values. Correlation coefficient values higher than 0.9 were always obtained. The MO constant was found to be close to the unit, so being assumed to be equal to 1.0, along with the determination of the allometric exponent for macronutrients. The allometric exponent b characterized the curvature for each nutrient.
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