Fine and coarse phosphate rocks were compounded with elementary S and used as fertilizers in pot cultures of oat, mustard, maize, lupine and rye for 2 years. An increased crop (15-142%) was achieved after addn. of the mixed fertilizers in the 2nd year of the study esp. at higher phosphate-S mass ratio (14:1 or 10:1). An increase of P content in the plant tissues (up to 20%) was also detd. The most positive effect was obsd. for lupine, the most negative for mustard.