Table 3.

Effect of biochar and biofertilizer on photosynthetic pigment contents in cotton leaves.

Cd (mg kg−1)	Amendments (%)	Photosynthetic pigment contents (mg kg−1 FW)
		Chl a	Chl b	Chl a/b	Car
H0	B0	1.31 ± 0.05 f.	0.48 ± 0.02 d	2.71 ± 0.74 e	0.74 ± 0.03 de
	B1	1.84 ± 0.08 bc	0.57 ± 0.02 cd	3.22 ± 0.88 b	0.88 ± 0.04 b
	J1	2.02 ± 0.08 a	0.63 ± 0.03 a	3.21 ± 0.97 bc	0.97 ± 0.04 a
H1	B0	1.29 ± 0.05 f.	0.47 ± 0.02 d	2.74 ± 0.73 e	0.73 ± 0.03 de
	B1	1.70 ± 0.07 cd	0.55 ± 0.02 c	3.08 ± 0.86 bcd	0.86 ± 0.04 bc
	J1	1.89 ± 0.08 ab	0.61 ± 0.03 ab	3.09 ± 0.87 bcd	0.87 ± 0.04 b
H2	B0	1.23 ± 0.05 f.	0.46 ± 0.02 d	2.66 ± 0.73 e	0.73 ± 0.03 de
	B1	1.58 ± 0.06 de	0.55 ± 0.02 c	2.87 ± 0.79 de	0.79 ± 0.03 cd
	J1	1.85 ± 0.08 b	0.57 ± 0.02 c	3.27 ± 0.80 b	0.80 ± 0.03 cd
H3	B0	1.07 ± 0.04 g	0.37 ± 0.01 e	2.93 ± 0.69 cde	0.69 ± 0.03 e
	B1	1.54 ± 0.06 e	0.48 ± 0.02 d	3.18 ± 0.72 bc	0.72 ± 0.03 de
	J1	1.82 ± 0.07 bc	0.50 ± 0.02 d	3.62 ± 0.77 a	0.77 ± 0.03 d
Regression tests (significance)
H		ns	*	ns	**
BJ		ns	ns	ns	ns
BJ*H		ns	ns	ns	ns

Values show the means of five replicates ± SE. Different lowercase letters in the same column indicate significant differences (P < 0.05) in photosynthetic pigment contents among individual treatments. **, P < 0.01; ns, P ≥ 0.05.