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). Roberts and Bonds (1975)
b). Cousens et al (1984&1985)
c). Zimdahl 1980
d). None of these