Production practices that influence weed shift are a). Effectiveness of weed management program b). Speed of weed shift occurrence c). Interface areas d). All Answer : d). All...
A curvilinear relationship between weed density and crop yield was reported by a). Zimdahl 1980 b). Roberts and Bonds (1975) c). Cousens et al (1985) d). None of these Answer : b). Roberts and Bonds (1975)...
The sigmoidal relationship between weed density and crop yield was proposed by a).Zimdahl 1980 b). Roberts and Bonds (1975) c). Cousens et al (1985) d). None of these Answer : a).Zimdahl 1980...
A rectangular hyperbolic relationship be tween weed density and crop yield is pro posed by a). Roberts and Bonds (1975) b). Cousens et al (1984&1985) c). Zimdahl 1980 d). None of these
. A non-competitive crop requiring weed free period of three or more months a). Maize b). Rice c). Soybean d). Onion Answer : d). Onion...
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