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ix RÉSUMÉxi GENERAL INTRODUCTION13 CHAPTER 1: Explaining conservation agriculture maize yield gains in Southern Africa21 CHAPTER 2: Soil carbon stocks in conservation agriculture systems of Southern Africa47 CHAPTER 3: Do closing knowledge gaps close yield gaps? On-farm conservation agriculture trials and adoption dynamics in three smallholder farming areas in Zimbabwe83 GENERAL DISCUSSION115 REFERENCES127 APPENDIX139 ACKNOWLEDGEMENTS149

Finding the truth in wishful thinking: an on-farm study on maize-based conservation agriculture systems in Southern Africa