. 2021 Apr 20;28(7):3965–3971. doi: 10.1016/j.sjbs.2021.04.016

Table 5.

Shoot Zn and Fe concentrations (mg kg⁻¹) of tobacco plant under increasing Cd doses in the treatments of corn cob (CB) and rice husk (RB) biochars produced at different pyrolysis temperatures.

Cd Dose (mg kg⁻¹)	Control	CB400	CB500	CB600	RB400	RB500	RB600
Cd Dose (mg kg⁻¹)	Zn concentration (mg kg⁻¹)
Cd 0	28.6^a	25.1	25.6^a	26.8	25.4^a	24.0	26.8^a
Cd 2.5	27.3^ab	23.4	23.4^ab	24.0	23.7^a	23.6	25.9^ab
Cd 5.0	24.6^b	21.7	21.1^b	23.6	21.5^b	23.2	23.4^b
Average	26.8^A	23.4^B	23.4^B	24.8^B	23.5^B	23.6^B	25.4^A
Feconcentration (mg kg⁻¹)
Cd 0	137.3^a	113.4	126.9^a	132.8^ab	133.6^a	124.6^a	211.4
Cd 2.5	126.2^a	114.6	119.5^ab	102.7^b	112.9^b	118.9^ab	221.3
Cd 5.0	105.9^b	119.2	107.5^b	154.3^a	102.8^b	104.5^b	212.0
Average	123.1^AB	115.7^B	118.0^B	129.9^A	116.4^B	116.0^B	214.9^A

The means indicated with the same capital letter in the same row are not significantly different (p < 0.05).

The means indicated with the same small letter in the same column are not significantly different (p < 0.05).