Table 5 shows the means values obtained for the rosebushes productivity, in each test, during the experiment. An increase in the production of commercial stems was observed when using the anaerobic and the nitrified effluents. The means were significantly higher than those obtained for the use of clean water, even when they were fertilized. The use of nitrified effluent without fertilization caused a productivity increase of 31.8 %. These data differ from those presented by Nirit et al. (2006) who saw no difference in productivity with rosebushes irrigated with treated effluent and drinking water.