Weed flora in maize grown as a second crop in the region of Slavonia.
Field studies were conducted in 1983-84 to investigate the weed flora in maize grown as a 2nd crop on 3 soil types (eutric brown, luvisol and pseudogley of sloping terrains) in the region of Slavonia. Maize cv. OSSK 247, OSSK 251 and Bc 183 was grown under conditions of irrigation and dry farming, with or without herbicide application. Irrigation was found to significantly increase the number and biomass of Echinochloa crus-galli plants, with the most significant effects found on pseudogley. However, weed species achieved marked increases in biomass even in dry months without irrigation when the maize crop showed notably retarded growth. The efficacy of Dual [metolachlor] + Radazin [atrazine] (4 + 2 litres/ha) was satisfactory, with higher av. control values in irrigated conditions than in dry farming conditions. The highest av. grain and biomass yields were attained on irrigated plots with herbicides applied, while the lowest yields were found in dry farming conditions without weed control.