The data have been presented in Figs 4–7 in the publication. Ten treatments have been indicated by treatment codes as "MM" for maize monocrop, "WW" for wheat monocrop, "BB" for faba bean monocrop, "PP" for pea monocrop, "MW" for maize/wheat intercrop, "MB" for maize/faba bean intercrop, "MP" for maize/pea intercrop, "WB" for faba bean/wheat intercrop, "BP" for faba bean/pea intercrop, and "WP" for wheat/pea intercrop.