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Data are represented as mean ± SE. (A). Xiaogan, 2011; (B). Xiaogan, 2012; (C). Xiaogan, 2013; (D) Suizhou, 2012. There was no significant difference between Bt rice and control plots at the same sampling time, based on Student's t-test (N = 4). Repeated measures ANOVA: (A). F1,6 = 0.059, P = 0.816; (B). F1,6 = 0.058, P = 0.777; (C). F1,6 = 1.366, P = 0.287; (D). F1,6 = 0.964, P = 0.364.
