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Soils were fertilized with gypsum (CaSO 4 ·2H 2 O) at rates up to 4 t·ha -1 , and Ca 2+  concentrations in pods of 12 snap bean ( Phaseolus vulgaris  L.) cultivars were determined, with the intention of improving snap beans as a source of Ca 2+  for human nutrition. The addition of gypsum to the soil did not affect the Ca 2+  concentration of pods, even though Ca 2+  in the soil solution increased from 4 to 15 mmol·L -1 . Calcium concentrations of pods of the various snap bean cultivars ranged from 4.1 to 5.7 mg·g -1  dry mass. `Top Crop', `Astrel', `Tenderlake', and `True Blue' had the highest Ca 2+  concentration in the pods and `Labrador' and `Roma II' had the lowest. The results suggest that factors other than Ca 2+  supply influenced the Ca 2+  concentration of the snap bean pod. Therefore, increased Ca 2+  concentration of pods may be better achieved through breeding and selection rather than Ca 2+  fertilization when Ca 2+  levels in soil are sufficient.

Comparison of Soil and Genotypic Effects on Calcium Concentration of Snap Bean Pods