Effect of Pendimethalin on Relative Tolerance of Sorghum in Northern Guinea Savanna Areas of Nigeria
Keywords:Relative tolerance, sorghum, herbicide rates, location
Field trials were carried out at different location to determine the relative tolerance of sorghum to different rates of pendimethalin application during the 2012 cropping season in Mubi (Latitude 100 15II N and Longitude 130 16II E at an altitude of 696m above sea level) and Gombe (Latitude 110 30II N and Longitude 100 20II E at an altitude of 240m above sea level). The trials consisted of eight treatments; 1.0, 2.0, 3.0, 4.0. 5.0 and 6.0kg a.i/ha rates of Pendimethalin, plus weed free and weedy check. The herbicide rates were assigned to the main plot as main treatment while sorghum variety was assigned to subplots as sub treatment replicated three times in a split plot design. The following data were collected, days to 50% emergence, crop injury score, crop vigour score, plant height, leaf area index, weed cover score, weed fresh weight, weed dry weight, grain yield and 1000 grain weight in both locations respectively. Result indicates that sorghum can tolerate up to 3.0kg a.i/ha rate of Pendimethalin in both location. However, rates of Pendimethalin perform better than the weedy check but weed free was significantly superior to all treatments across the two locations. Hence it can be concluded that 3.0kg i.a/ha of Pendimethalin can be tolerated by sorghum with relatively low weed fresh and dry weights as well as higher grain yield and 1000 grain weight.
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