The use of a herbicide to investigate catchment management approaches to meeting Sustainable Intensification (SI) objectives

Abstract

This study adopts a grassweed herbicide as a focus for an interdisciplinary approach to investigating the potential of a combination of collaborative and independent management practices to meet multiple SI objectives. The study used an intensively studied 900 ha catchment in Leicestershire where propyzamide is routinely used to control grass weeds in oilseed rape. We used a combination of data collection, modelling and a semi-structured discussion with participating farmers to explore relevant issues. An improved understanding of temporal changes in soil moisture and spatial differences in soil compaction were identified as being useful to more informed management. Split application of propyzamide, or reduced oilseed rape area were not regarded as viable because of the level of collaboration required between farms. A role was recognised for external catchment-scale coordination and compensation. Existing economic and agronomic pressures may contribute to more sustainable management, but longer-term planning and support to deliver multiple public benefits are required from government.