Fig. 7From: Combined application of biochar and nitrogen fertilizer promotes the activity of starch metabolism enzymes and the expression of related genes in rice in a dual cropping systemChanges in the rice grain starch (A and B) and amylose content (C and D) in response to different biochar and N levels during the early (A) and late (B) seasons. Vertical bars represent the standard error of the mean. Different letters above columns indicate significant differences (P < 0.05)Back to article page