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A comparison of star formation properties as a function of environment ismade from the spectra of identically selected cluster and field galaxies in theCNOC 1 redshift survey of over 2000 galaxies in the fields of fifteen X-rayluminous clusters at 0.18<z<0.55. The ratio of bulge luminosity to total galaxyluminosity (B/T) is computed for galaxies in this sample, and this measure ofmorphology is compared with the galaxy star formation rate as determined fromthe [OII]3727 emission line. The mean star formation rate of cluster galaxiesbrighter than M_r= -17.5 + 5 log h is found to vary from 0.17 +- 0.02 h^{-2}M_sun/yr at R200 (1.5-2 Mpc/h) to zero in the cluster center, and is alwaysless than the mean star formation rate of field galaxies, which is 0.39 +- 0.01h^{-2}M_sun/yr. It is demonstrated that this significant difference is not dueexclusively to the difference in morphological type, as parameterized by theB/T value, by correcting for the B/T-radius relation. The distribution of [OII]equivalent widths among cluster galaxies is skewed toward lower values relativeto the distribution for field galaxies of comparable physical size, B/T andredshift, with a statistical significance of more than 99%. The clusterenvironment affects not only the morphological mix of the galaxy population,but also suppresses the star formation rate within those galaxies, relative tomorphologically similar galaxies in the field.

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