Any single approach to weed control will cause the many different weeds in any field to change, or ‘shift’, in terms of their relative competitive pressure on the crop and new species will invade to fill ecological niches left by those most effectively controlled. This is not least due to the way in which paraquat has generally been used in conjunction with other herbicides and cultural weed control methods. Resistance to paraquat has only arisen in isolated cases in a few unimportant species over the course of more than 40 years. ![]() ![]() ![]() Resistance has arisen quickly in some cases, eg to the sulfonylureas, and more slowly, but inevitably, in others, e.g. Using herbicides greatly simplifies weed control, but relying too heavily on any chemical weedkiller ultimately results in some weed species becoming resistant. IWM: A Solution to Weed Shifts and Resistance Tillage is a well proven means of controlling weeds, so are other methods good enough to use in an integrated approach to weed management in no-till systems? This article examines how farmers can reap the rewards of both techniques together. Although advanced in concept, these tools are straightforward and can be adapted for use in all cropping systems, from highly mechanised ones to subsistence farming, all around the world. ![]() Integrated weed management (IWM) and no-till are advanced agronomic tools with common aims to improve efficiency and profitabilty, while reducing the environmental impact of crop production.
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June 2023
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