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Relationships between spring rainfall and yield losses prevented by herbicides in wheat and barley in Canterbury were used in a simple bio-economic model to evaluate the effects of spring rainfall on the economics of herbicide application in these crops. The model assumed herbicide application has no flow-on economic consequences for succeeding crops, and predicted the probability of breaking even (or better) on prophylactic use of herbicide in wheat and barley over a range of September and October rainfall levels respectively. The analysis revealed that while such herbicide usage is economic in many crops in many seasons, there is potential for withholding herbicides, particularly in seasons with low spring rainfall.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Economics of herbicide use in cereal crops - influence of spring rainfall