The effect of drought stress levels and weed management on some qualitative and quantitative indicators of KS260 corn and sorghum

It is necessary to investigate the effect of drought stress and the presence or absence of weeds on the growth and yield of important crops such as corn and sorghum. For this purpose, a field study was conducted in the educational farm of Ferdowsi University of Mashhad in the crop year of 2014 in the form of two separate experiments for two forage corn plants KS260 and forage sorghum of Speedfeed in factorial form in the form of a randomized complete block design with 3 replicates. The first treatment was irrigation levels of 65%, 75%, 85% and 100% of the percentage of water requirement of the reference plant (evaporation pan)and the second treatment was weed control management (weeding and not weeding). In this project, the growth indices of corn and sorghum were measured and the effect of different levels of irrigation on these indices was investigated. the lowest yield of wet and dry fodder was observed in corn and sorghum under extreme water deficit conditions., Weeding corn and sorghum fields increased about 35% of fresh and dry weight of corn fodder and 25% increase of fresh weight of fodder and 100% of dry weight of sorghum fodder. Weeding in all conditions reduces the competition of these species with crops and increases the growth indicators of forage, including leaf surface durability (49% corn and 11% sorghum), relative growth rate (9% corn and 22% sorghum). , net growth rate (23% corn and 25% sorghum) and height (12% corn and 15% sorghum).