The association of weeds, such as narrow leaf hawksbeard and horseweed with both zero-tillage continuous-cropping and crop-fallow treatments, has been suggested to be due to the lack of tillage and the presence of plant residues (Derksen et al., 1994)
The association of weeds, such as narrow leaf hawksbeard and horseweedwith both zero-tillage continuous-cropping and crop-fallowtreatments, has been suggested to be due to the lack of tillageand the presence of plant residues (Derksen et al., 1994)