. 2022 Jul 28;15(15):5233. doi: 10.3390/ma15155233

Table 3.

The content of manganese, iron, and cobalt in the soil (mg kg⁻¹ d.m.).

Material	Petrol Dose (cm³ kg⁻¹ d.m. of Soil)				Average	r
Material	0	2.5	5	10	Average	r
Manganese (Mn)
Without amendments	271.8 ^ab	299.9 ^b	272.6 ^ab	258.3 ^a	275.6 ^A	−0.573
Compost	271.7 ^ab	283.5 ^ab	287.0 ^ab	293.4 ^ab	283.9 ^AB	0.939
Bentonite	271.2 ^ab	342.8 ^c	291.3 ^ab	269.1 ^ab	293.6 ^B	−0.304
CaO	274.1 ^ab	282.2 ^ab	288.5 ^ab	295.1 ^ab	284.9 ^AB	0.975
Average	272.2 ^I	302.1 ^II	284.8 ^I	279.0 ^I	284.5	−0.061
LSD_p_≤0.01 for:	petrol dose—11.2, materials—11.2, interaction—22.4
Iron (Fe)
Without amendments	8307 ^cde	9190 ^ghi	8472 ^def	8225 ^bcde	8549 ^A	−0.357
Compost	7179 ^a	7472 ^a	9058 ^fgh	9333 ^ghi	8260 ^B	0.911
Bentonite	8174 ^bcd	9704 ⁱ	9768 ⁱ	7784 ^abc	8857 ^C	−0.309
CaO	7683 ^ab	8829 ^efg	9597 ^hi	9478 ^hi	8897 ^C	0.814
Average	7836 ^I	8799 ^II	9224 ^III	8705 ^II	8641	0.530
LSD_p_≤0.01 for:	petrol dose—180, materials—180, interaction—360
Cobalt (Co)
Without amendments	3.12 ⁱ	3.09 ⁱ	2.91 ^hi	2.52 ^ef	2.91 ^A	−0.976
Compost	2.82 ^gh	2.70 ^fgh	2.64 ^efg	2.40 ^de	2.64 ^B	−0.994
Bentonite	3.09 ⁱ	2.40 ^de	2.10 ^bc	1.92 ^ab	2.38 ^C	−0.896
CaO	2.19 ^cd	1.89 ^ab	1.86 ^ab	1.68 ^a	1.91 ^D	−0.928
Average	2.81 ^I	2.52 ^II	2.38 ^III	2.13 ^IV	2.46	−0.978
LSD_p_≤0.01 for:	petrol dose—0.076, materials—0.076, interaction—0.153

r—correlation coefficient. Values with different letters are significantly different at p ≤ 0.01: ^I–IV for the petrol dose, ^A–D for the material amendments and ^a–i for the interaction between the petrol dose and the material amendments (ANOVA, Tukey’s HSD test).