A new NP fertilizer NPS(Mikro) was prepd. by wet granulation of components and tested in field expts. to det. its influence on yield size and quality of winter rape. The field expts. included tested product and a std. one (conc. of superphosphate with urea) applied in 2 doses. The effect of N and P contained in both fertilizers on yield size was equivalent. Reduced dose of the fertilizers showed a similar efficacy as the optimum one. The NPS(Mikro) fertilizer improved the fat content in winter rape grains.