In  a  vegetation  experiment,  the  effect  of composts made  from  unsorted municipal solid  waste  and  urban  green  waste  on  the  content  of zinc  in plants  has  been  analyzed. The  municipal waste  composts matured  in  heaps for 1,  3 and  6 months. They were applied in three rates: 10, 20 and 30 g kg-1  of soil.  The compost made of urban  green waste  aged in  a pile for 6 months  and was  added to soil in  the amount  of 10 g kg-1  of soil.  It  has  been determined  that  the content  of zinc  in  plants   was  varied  and  depended on the  type  and rates  of compost used as  well  as  the  species  of crops. Application  of higher  rates  of composts did  not invariably result  in  an  increased  concentration  of zinc  in  plant tissues;   on the contrary, in  some cases  the  level  of zinc  determined  in fertilized plants  was  lower  than  in the control.  Much  more  elevated  concentrations  of zinc  were  found after  the  application  of fresh compost made  of municipal  waste (maturing for  one month  in  a  heap).  Fertilization of maize and  barley  with  urban green  waste  compost produced  a  more  favourable  result than  the application of analogous  rates  of municpal  solid  waste  compost, as  the  plants  contained  ess zinc.  With   respect  to  the  other  test  plants,   such  as  sunflower,  mustard   and phacelia,   the  application   of composted green  matter  caused  a  considerable increase  in  the content  of zinc,  as  compared  with  the  treatments fertilized  with composted municipal wa- ste,  at  the same fertilization rates.