Different N-fertilization sources affecting the native soil organic matter mineralization on Technosols under iron ore tailing

Oliveira, Paula Afonso de; Assis, Igor Rodrigues de; Dias, Luiz Eduardo; Silva, Ivo Ribeiro da; Barbosa, Gustavo Magalhães Nunes; Teixeira, Rafael da Silva; Campos, Rafaella

doi:10.36783/18069657rbcs20200088

Paula Afonso de Oliveira

Universidade Federal de Viçosa, Departamento de Solos, Programa de Pós-Graduação em Solos e Nutrição de Plantas, Viçosa, Minas Gerais, Brasil.

http://orcid.org/0000-0003-3888-7738

Igor Rodrigues de Assis ^**Corresponding author: E-mail: igor.assis@ufv.br

Universidade Federal de Viçosa, Departamento de Solos, Viçosa, Minas Gerais, Brasil.

http://orcid.org/0000-0002-2971-5531

Luiz Eduardo Dias

Universidade Federal de Viçosa, Departamento de Solos, Viçosa, Minas Gerais, Brasil.

http://orcid.org/0000-0003-2254-2428

Ivo Ribeiro da Silva

Universidade Federal de Viçosa, Departamento de Solos, Viçosa, Minas Gerais, Brasil.

http://orcid.org/0000-0002-6730-1487

Gustavo Magalhães Nunes Barbosa

Universidade Federal de Viçosa, Departamento de Solos, Programa de Pós-Graduação em Solos e Nutrição de Plantas, Viçosa, Minas Gerais, Brasil.

http://orcid.org/0000-0003-2994-688X

Rafael da Silva Teixeira

Universidade Federal de Viçosa, Departamento de Solos, Viçosa, Minas Gerais, Brasil.

http://orcid.org/0000-0002-3690-5659

Rafaella Campos

Universidade Federal de Viçosa, Departamento de Solos, Programa de Pós-Graduação em Solos e Nutrição de Plantas, Viçosa, Minas Gerais, Brasil.

http://orcid.org/0000-0002-5647-7030

*Corresponding author: E-mail: igor.assis@ufv.br

Editors: José Miguel Reichert orcid.org/0000-0001-9943-2898, Clístenes Nascimento orcid.org/0000-0002-5103-5524, and Adelson Paulo Araújo orcid.org/0000-0002-4106-6175

AUTHOR CONTRIBUTIONS

Conceptualization: orcid.org/0000-0003-3888-7738 Paula Afonso de Oliveira (equal), orcid.org/0000-0002-2971-5531 Igor Rodrigues de Assis (supporting), orcid.org/0000-0003-2254-2428 Luiz Eduardo Dias (lead), and orcid.org/0000-0002-6730-1487 Ivo Ribeiro da Silva (equal).

Methodology: orcid.org/0000-0002-6730-1487 Ivo Ribeiro da Silva (supporting).

Validation: orcid.org/0000-0002-3690-5659 Rafael da Silva Teixeira (equal) and orcid.org/0000-0002-5647-7030 Rafaella Campos (equal).

Formal analysis: orcid.org/0000-0003-3888-7738 Paula Afonso de Oliveira (equal), orcid.org/0000-0002-2971-5531 Igor Rodrigues de Assis (equal), orcid.org/0000-0003-2254-2428 Luiz Eduardo Dias (equal), and orcid.org/0000-0002-6730-1487 Ivo Ribeiro da Silva (equal).

Investigation: orcid.org/0000-0003-3888-7738 Paula Afonso de Oliveira (equal), orcid.org/0000-0003-2254-2428 Luiz Eduardo Dias (supporting), orcid.org/0000-0002-6730-1487 Ivo Ribeiro da Silva (equal), and orcid.org/0000-0003-2994-688X Gustavo Magalhães Nunes Barbosa (equal).

Data curation: orcid.org/0000-0003-3888-7738 Paula Afonso de Oliveira (lead) and orcid.org/0000-0003-2994-688X Gustavo Magalhães Nunes Barbosa (equal).

Writing – original draft: orcid.org/0000-0003-3888-7738 Paula Afonso de Oliveira (equal), orcid.org/0000-0002-2971-5531 Igor Rodrigues de Assis (equal), orcid.org/0000-0003-2254-2428 Luiz Eduardo Dias (equal), orcid.org/0000-0003-2994-688X Gustavo Magalhães Nunes Barbosa (equal), orcid.org/0000-0002-5647-7030 Rafael da Silva Teixeira (equal), and orcid.org/0000-0002-5647-7030 Rafaella Campos (supporting).

Visualization: orcid.org/0000-0002-5647-7030 Rafaella Campos (supporting).

Supervision: orcid.org/0000-0002-2971-5531 Igor Rodrigues de Assis (equal) and orcid.org/0000-0003-2254-2428 Luiz Eduardo Dias (lead).

Funding acquisition: orcid.org/0000-0003-2254-2428 Luiz Eduardo Dias (lead).

Properties	Topsoil	Mining tailing
	Chemical properties
pH(H₂O)	5.65	7.30
Al³⁺ (cmol_c dm^-3)	0.00	0.00
Ca²⁺ (cmol_c dm^-3)	1.76	0.79
Mg²⁺ (cmol_c dm^-3)	1.23	0.02
K⁺ (cmol_c dm^-3)	85.00	19.20
P (mg dm^-3)	3.60	8.26
S (mg dm^-3)	2.50	17.80
Fe (mg dm^-3)	196.90	52.78
Zn (mg dm^-3)	4.56	1.51
Mn (mg dm^-3)	87.50	68.70
Cu (mg dm^-3)	1.60	0.99
CEC (cmol_c dm^-3)	9.51	1.13
Cr (mg dm^-3)	0.00	0.78
Ni (mg dm^-3)	0.00	1.04
Cd (mg dm^-3)	0.00	0.08
Pb (mg dm^-3)	0.00	0.10
SOC (dag kg^-1)	3.01	0.09
TN (dag kg^-1)	0.20	0.00
	Physical properties
Coarse sand (g kg^-1)	410	270
Fine sand (g kg^-1)	110	330
Silt (g kg^-1)	170	350
Clay (g kg^-1)	310	50
Dp (Mg m^-3)	2.80	3.16
Ds (Mg m^-3)	0.98	2.10

Properties	Sewage sludge	Household waste
pH(H₂O)	4.25	6.57
Al (g kg^-1)	8.11	6.68
Ca (g kg^-1)	1.58	22.40
Mg (g kg^-1)	0.19	2.06
Na (g kg^-1)	77.69	840.17
K (g kg^-1)	0.11	1.19
P (g kg^-1)	1.89	0.63
S (g kg^-1)	1.66	0.97
Fe (g kg^-1)	10.93	8.17
Zn (mg kg^-1)	164.95	8.84
Mn (mg kg^-1)	22.25	571.27
Cu (mg kg^-1)	76.01	3.90
Cr (mg kg^-1)	2.80	14.75
Ni (mg kg^-1)	5.47	8.37
Cd (mg kg^-1)	0.20	0.00
Pb (mg kg^-1)	6.11	0.00
C (%)	21.81	18.27
N (%)	2.86	0.50

Treatments			Orthogonal contrasts
Plant	ONF	MNF	C₁	C₂	C₃	C₄	C₅	C₆	C₇	C₈	C₉	C₁₀	C₁₁	C_A1	C_A2
-	-	-	-1	-1	-2	0	0	0	0	0	0	0	0	0	0
-	SS	-	-1	-1	1	-1	0	0	0	0	0	0	0	-1	0
-	HWC	-	-1	-1	1	1	0	0	0	0	0	0	0	-1	0
-	-	+	-1	1	0	0	-2	0	0	0	0	0	0	2	0
-	SS	+	-1	1	0	0	1	-1	0	0	0	0	0	0	0
-	HWC	+	-1	1	0	0	1	1	0	0	0	0	0	0	0
+	-	-	1	0	0	0	0	0	-1	-2	0	0	0	0	0
+	SS	-	1	0	0	0	0	0	-1	1	-1	0	0	0	-1
+	HWC	-	1	0	0	0	0	0	-1	1	1	0	0	0	-1
+	-	+	1	0	0	0	0	0	1	0	0	-2	0	-2	2
+	SS	+	1	0	0	0	0	0	1	0	0	1	-1	1	0
+	HWC	+	1	0	0	0	0	0	1	0	0	1	1	1	0

Contrasts	Total soil CO₂-C ac.	Plant
Contrasts	Total soil CO₂-C ac.	ONF derived-CO₂-C ⁽¹⁾ (1) Data transformed by quadratic inverse transformation [y” = −2 / (y’+100)2]. C: orthogonal contrasts; CA: additional contrasts.	Soil derived-CO₂-C ⁽¹⁾ (1) Data transformed by quadratic inverse transformation [y” = −2 / (y’+100)2]. C: orthogonal contrasts; CA: additional contrasts.	PE
	g m^-2	--------------------g m^-2--------------------		%
C₁	501.09 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	-277.45 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	-1669.54 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	-227.10 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.
C₂	215.05 ^* *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	-55.28 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	270.33 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	-140.17 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.
C₃	426.84 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	166.36 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	260.48 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	183.64 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.
C₄	198.19 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	47.44 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	150.76 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	105.92 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.
C₅	209.28 ^* *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	111.09 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	98.19 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	43.47 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.
C₆	124.43 ^* *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	54.65 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	69.79 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	23.53 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.
C₇	109.25 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.
C₈	173.38 ^* *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.
C₉	36.03 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.
C₁₀	-0.13 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.
C₁₁	95.53 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.
C_A1	-138.43 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	-166.36 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	27.93 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	-183.64 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.

Contrast	Plant
Contrast	Plant derived-CO₂-C	Soil derived-CO₂-C	RPE	Shoot DM	Root DM
	------------------g m^-2------------------		%	---------g per column---------
C₇	192.72 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	-136.28 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	-325.37 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	10.03 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	1.00 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.
C₈	83.70 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	167.14 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	110.70 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	2.58 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	0.12 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.
C₉	-64.06 ^* *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	100.09 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	67.79 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	0.54 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	0.03 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.
C₁₀	79.99 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	-23.57 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	-11.01 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	0.45 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	0.26 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.
C₁₁	39.17 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	14.19 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	4.61 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	0.25 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	-0.05 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.
C_A2	47.25 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	-130.85 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	-246.47 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	5.52 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	0.45 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.

f_{SS or HWC} = [(C O_{2} - δ^{13} C_{+ SS or + HWC (- Plant)} - C O_{2} - δ^{13} C_{- SS or - HWC (- Plant)}) / (δ^{13} C_{SS or HWC} - C O_{2} - δ^{13} C_{- SS or - HWC (- Plant)})

f_{Plant} = [(C O_{2} - δ^{13} C_{+Plant (+SS,-SS+HWC or HWC)} - C O_{2} - δ^{13} C_{- plant (+SS, -SS + HWC or HWC)}) / (δ^{13} C_{Plant} - C O_{2} - δ^{13} C_{- plant (+SS,-SS+HWC or HWC)})

p r i m i n g e f f e c t_{OF} (%) = [(T o t a l S o i l C o_{2} - C f l u x_{Topsoil (+ SS or +HWC)} - T o t a l S o i l C O_{2} - C f l u x_{Topsoil (NONF)}) / T o t a l S o i l C O_{2} - C f l u x_{Topsoil (NONF)}] \times 100

R h i z o s p h e r e p r i m i n g e f f e c t (%) = [(T o t a l S o i l C o_{2} - C f l u x_{Topsoil (+Plant)} - T o t a l S o i l C O_{2} - C f l u x_{Topsoil (-Plant)}) / T o t a l S o i l C O_{2} - C f l u x_{Topsoil (-Plant)}] \times 100

[1] *Corresponding author: E-mail: igor.assis@ufv.br

Contrasts	Total soil CO₂-C ac.	Plant
Contrasts	Total soil CO₂-C ac.	ONF derived-CO₂-C ⁽¹⁾ (1) Data transformed by quadratic inverse transformation [y” = −2 / (y’+100)2]. C: orthogonal contrasts; CA: additional contrasts.	Soil derived-CO₂-C ⁽¹⁾ (1) Data transformed by quadratic inverse transformation [y” = −2 / (y’+100)2]. C: orthogonal contrasts; CA: additional contrasts.	PE
	g m^-2	--------------------g m^-2--------------------		%
C₁	501.09 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	-277.45 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	-1669.54 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	-227.10 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.
C₂	215.05 ^* *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	-55.28 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	270.33 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	-140.17 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.
C₃	426.84 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	166.36 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	260.48 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	183.64 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.
C₄	198.19 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	47.44 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	150.76 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	105.92 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.
C₅	209.28 ^* *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	111.09 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	98.19 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	43.47 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.
C₆	124.43 ^* *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	54.65 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	69.79 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	23.53 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.
C₇	109.25 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.
C₈	173.38 ^* *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.
C₉	36.03 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.
C₁₀	-0.13 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.
C₁₁	95.53 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	0.00 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.
C_A1	-138.43 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	-166.36 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.	27.93 ^ns *, , and ns significant at 1 and 5 % and no significant to F test, respectively.	-183.64 ^ , *, and ns significant at 1 and 5 % and no significant to F test, respectively.

Contrast	Plant
Contrast	Plant derived-CO₂-C	Soil derived-CO₂-C	RPE	Shoot DM	Root DM
	------------------g m^-2------------------		%	---------g per column---------
C₇	192.72 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	-136.28 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	-325.37 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	10.03 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	1.00 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.
C₈	83.70 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	167.14 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	110.70 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	2.58 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	0.12 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.
C₉	-64.06 ^* *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	100.09 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	67.79 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	0.54 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	0.03 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.
C₁₀	79.99 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	-23.57 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	-11.01 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	0.45 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	0.26 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.
C₁₁	39.17 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	14.19 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	4.61 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	0.25 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	-0.05 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.
C_A2	47.25 ^ns *, , and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	-130.85 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	-246.47 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	5.52 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.	0.45 ^ , *, and ns significant at 1and 5 %, and no significant to F test, respectively. C: orthogonal contrasts; and CA: additional contrasts.

Brasil

Brasil

Different N-fertilization sources affecting the native soil organic matter mineralization on Technosols under iron ore tailing

ABSTRACT: