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To investigate the effects of various biochar application levels on the growth physiology and water use efficiency of dry direct‐seeded rice (DDSR) in the black soil region of north‐east China, five biochar application treatments consisting of 2% (BC1), 4% (BC2), 6% (BC3), 8% (BC4) and 10% (BC5) were set, and no biochar application was used as the control treatment (CK). The differences in photosynthetic...