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A field experiment was carried out in a semi-arid region of Iran during the 2006-2007 growing season to investigate canola seed yield as affected by nitrogen (N) and natural zeolite (Z) rates. This experiment studied N efficiency and N leaching loss in a sandy soil. Experimental treatments consisted of a factorial combination of three N levels (90, 180, and 270 kg N ha(-1)) and four zeolite rates (0, 3, 6, and 9 t zeolite ha(-1)). The result showed that the greatest seed yield (2452.3 kg ha(-1)) was obtained from the N(270)Z(9) treatment whereas the control treatment (N(0)Z(0)) produced the lowest seed yield (1038.3 kg ha(-1)). Moreover, use of 270 kg N ha(-1) without zeolite (N(270)Z(0)) led to the greatest amount of N leaching loss (144.23 kg ha(-1)). Zeolite application clearly reduced N leaching loss in all N rates. This justified low N-use efficiency in high N applications. More N uptake and more canola seed yield is attributed to zeolite application.