1. The application potential of coal fly ash for selenium biofortification Honghua He, Jiayin Pang, Gao-Lin Wu and Hans Lambers 2. Cruciferlegume cover crop mixtures for biocontrol: Towards a new multi-service paradigm Antoine Couedel, John Kirkegaard, Lionel Alletto and Eric Justes 3. Do we need specific breeding for legume-based mixtures? Paolo Annicchiarico, Rosemary P. Collins, Antonio M. De Ron, Cyril Firmat, Isabelle Litrico and Henrik Hauggaard-Nielsen 4. A practical guide to genetic gain Jessica E. Rutkoski 5. Optimized agronomic management as a double-win option for higher maize productivity and less global warming intensity: A case study of Northeastern China Zhenwei Song, Xiaomin Feng, Rattan Lal, Manman Fan, Jun Ren, Hua Qi, Chunrong Qian, Jinrui Guo, Hongguang Cai, Tiehua Cao, Yang Yu, Yubo Hao, Xiaomin Huang, Aixing Deng, Chengyan Zheng, Jun Zhang and Weijian Zhang 6. The evolution of lowland rice-based production systems in Asia: Historic trends, determinants of change, future perspective Mathias Becker and Carlos Angulo