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BACKGROUND
Photosynthesis is the key to crop yield. The effect of biochar on photosynthetic physiology and soybean yield under continuous cropping is unclear. We conducted a long‐term field experiment to investigate the effects of co‐application of biochar and fertilizer (BCAF) on these parameters. Five treatments were established: F2 (fertilizer), B1F1 (3 t hm−2 biochar plus fertilizer), B1F2 (3...