Increasing plant density increases Bt toxin concentration of boll wall in cotton by decreasing boll setting speed

Table 1 Effect of plant density on boll setting rate and Bt toxin content in boll wall in 2017 and 2018

Treatment	2017		2018
Treatment	Boll setting rate/ (boll·plant^-1·d^-1)	Bt protein content/ (ng·g^-1FW)	Boll setting rate/ (boll·plant^-1·d^-1)	Bt protein content/ (ng·g^-1FW)
D1	0.51a	126.7d	0.50a	129.7d
D2	0.39b	152.5c	0.38b	155.1c
D3	0.29c	165.9b	0.31bc	170.2b
D4	0.25d	174.2ab	0.24cd	181.5ab
D5	0.24d	181.3a	0.22d	192.6a

D1-D5: 15 000, 25 000, 45 000, 60 000, and 75 000 plants per hectare, FW indicated fresh weight; the same letter among treatments are not significantly different (LSD test at 0.05 significance level).

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