Effect of Ploughing and Harrowing on a Herbicide Resistant Corn Poppy (Papaver rhoeas) Population
2003
Cirujeda, A. | Recasens, J. | Taberner, A.
A field trial on winter barley, containing a large infestation of a herbicide resistant Papaver rhoeas population, was established in North-eastern Spain during the cropping seasons 1998-99, 1999-00 and 2000-01. After decades of minimum tillage, ploughing was conducted in Winter 1998, Winter 2000 or in both 1998 and 2000 in part of the field as a preventive weed control strategy. Plant density assessments and quantification of the seed bank at the end of 3 years were taken. Less P. rhoeas emerged in the ploughed plots and the effect was still visible 2 years after ploughing. In the twice ploughed plots, emergence was higher than in the once ploughed plots but lower than in the non-ploughed treatment. Harrowing conducted post-emergence as an annual control method in part of the plots caused a remarkable reduction of the weed population in all three years. The effect caused by the harrowing was more important than the ploughing treatments. However, the combination of single ploughing and harrowing induced the lowest weed plant emergence. The depth distribution of P. rhoeas seed was similar for all treatments but there was a higher total seed bank in the twice ploughed plots. Occasional ploughing was found to be an effective method for placing P. rhoeas seeds in non-optimal germination situations. When the initial weed seed bank is very high as in this field trial, the reduction achieved by ploughing is not sufficient and an additional weed control method should be conducted.
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