Investigation of Fe, Mn, Zn and Cu content in various developmental phases of spring barley and winter rapeseed

The plants of spring barley and winter rapeseed were cultivated in 4 field rotation and in 4 fertilization treatments: 1) fertilized with NPK, 2) manure, 3) 1/2 NPK + 1/2 manure, 4) without any fertilizer. The content of trace elements in the above ground parts of barley and rapeseed depends on the developmental phase. Most Fe, Mn, Cu and Zn was found in the tillering phase of barley as well as in rosette phase of winter rapeseed. Differentiated organic-mineral fertilization did not effect the content of Fe, Mn, Zn and Cu in the field of the crops under investigation