Tihomir Predic1*, Rade Lukic2, Tatjana Cvijanovic3, Tatjana Docic – Kojadinovic4, Tatjana Malcic5, Dusica Pesevic6 1Agricultural institute of Republic of Srpska, Banja Luka, Bosnia and Herzegovina 2,3,4,5Agricultural institute of Republic of Srpska, Banja Luka, Bosnia and Herzegovina 6Faculty of Science, Banja Luka, Bosnia and Herzegovina *tiho.predic@gmail.com   Abstract Modern plant production involves the use of mineral […]