Decision support for sulphur applications to cereals

1 Summary 2 Objectives 2 Methods 2 Key results and conclusions 3 Implications 3 Detailed technical report 4 Background 4 1. Updating existing national status model 5 1.1 Updated databases 5 1.2 Revised model to account for land use distribution 7 1.3 Discussion 9 2. Review of experimental datasets 9 2.1 Criteria for selection of field trials data 9 2.2 Summary of datasets and overall response to sulphur fertilisers 10 2.3 Detailed summary of winter wheat trial database 11 2.4 Treatment factors contained within winter wheat trials database 13 2.5 Discussion 15 3. Analysis of factors influencing crop yield response. 15 3.1 Estimation of site factors 16 3.2 Comparison of treatments within experiments 17 3.3 Key factors driving crop yield responses to sulphur application 20 3.4 Discussion 26 4. Development of decision support framework 27 4.1 Categorisation of site factors influencing yield response 27 4.2 Matrix system to estimate yield responsiveness 28 4.3 Revised national status maps 28 4.4 Discussion 29 References 31 APPENDIX 1: Crop values, growing areas and other prices used in calculations 32