SC407 هيبريد ZEAMAYS اثر روشهاي مختلف استفاده از كولتيواتور و علفكش بر كنترل علفهاي هرز، عملكرد دانه و اجزاي علمكرد در ذرت

Effect of different methods of cultivation and herbicide usage on weed control, grain yield and yield components of corn (Zea mays hybrid SC704)

Cultivation and herbicide application are general methods of weed control in corn. An integrates of number cultivations and herbicide application methods affecting the efficiency of weed control. Cultivation alone is not effective and herbicide application despite environmental constrains, increases resistance of weeds. In this respect, an experiment was conducted in 1997 at the experimental field of Ramin Agricultural Research and Education Campus of Shahid Chamran University with 8 different combinations of cultivation number (0. 1 and 2 times cultivation) and herbicide application patterns (without herbicide, band applicates and broadcasting) and a weed free control. The experimental design was randomized complete block with 4 replications. The main weeds were Echinochloa Gras-gall, Cyperus spp. and Convolvulus arvensis. Herbicides were atrazine, alachior and 2, 4-D. Results showed that highest weed control was obtained with broadcast and band application of herbicide in corporation with two cultivations. Grain yield with integration treatments had better performance than non integrated methods. First cultivation improved corn yield but second cultivation did not. Band application of herbicides increased yield in contrast with no herbicide application but there were no differences with broadcast application. Among yield components, number of grain per row was affected by treatments. However. integration of band application with two cultivations could control weeds and produced acceptable yield with reduced rates of herbicides.