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Hand weeding wild: radish is it viable?

Plain text source: 
But the use of backpacker labour to weed wild radish could be viable where weeds are at extremely low levels, and this is the focus of new research in the Northern Agricultural Region... Mr Newman said trials at three Mullewa sites were assessing the efficacy of hand weeding wild radish using backpacker labour and developing costings for a range of wild radish densities... "When a grower is assessing a crop for spraying, he needs to know if hand weeding is a viable alternative, so we are attempting to develop a threshold for hand weeding based on counting weeds as we drive through the paddock," he said...