Photosynthetic and grain yield responses to intercropping of two common bean lines with maize under two types of fertilizer applications in the colombian amazon region

•Intercropping of two common bean lines with maize increased photosynthetic activity.•Application of organic fertilizer induced changes in photosynthetic activity.•Grain yield correlated positively with net carbon assimilation rate.•Smallholders benefit from intercropping of common bean with maize.