Fig. 8

The boll setting rate per plant and boll wall Bt toxin content under different DPC applications treatments in 2018. Sympol 1.5 g and 3.0 g represented the application rate of DPC during the peak flowering stage respectively, CK was the control. The vertical bar represents S.E. of the mean (n = 3) when the value exceeds the size of the symbol. Lowercase letters indicate significance analysis among boll setting rate per plant, and capital letters indicate significance analysis among Bt protein content. The same letter among treatments is not significantly different (P ≥ 0.05)