Condutividade elétrica aparente do solo em dois tipos de solo

Medeiros, Wilker Nunes; Valente, Domingos Sárvio Magalhães; Queiroz, Daniel Marçal de; Pinto, Francisco de Assis de Carvalho; Assis, Igor Rodrigues de

doi:10.5935/1806-6690.20180005

Wilker Nunes Medeiros ^**Autor para correspondência

Departamento de Engenharia Agrícola, Universidade Federal de Viçosa/UFV, Avenida Peter Henry Rolfs, s/n - Campus Universitário, Viçosa-MG, Brasil, 36.570-900, wilkermedeiros@yahoo.com.br, valente@ufv.br, queiroz@ufv.br, facpinto@ufv.br, igor.assis@ufv.br

Domingos Sárvio Magalhães Valente

Departamento de Engenharia Agrícola, Universidade Federal de Viçosa/UFV, Avenida Peter Henry Rolfs, s/n - Campus Universitário, Viçosa-MG, Brasil, 36.570-900, wilkermedeiros@yahoo.com.br, valente@ufv.br, queiroz@ufv.br, facpinto@ufv.br, igor.assis@ufv.br

Daniel Marçal de Queiroz

Departamento de Engenharia Agrícola, Universidade Federal de Viçosa/UFV, Avenida Peter Henry Rolfs, s/n - Campus Universitário, Viçosa-MG, Brasil, 36.570-900, wilkermedeiros@yahoo.com.br, valente@ufv.br, queiroz@ufv.br, facpinto@ufv.br, igor.assis@ufv.br

Francisco de Assis de Carvalho Pinto

Departamento de Engenharia Agrícola, Universidade Federal de Viçosa/UFV, Avenida Peter Henry Rolfs, s/n - Campus Universitário, Viçosa-MG, Brasil, 36.570-900, wilkermedeiros@yahoo.com.br, valente@ufv.br, queiroz@ufv.br, facpinto@ufv.br, igor.assis@ufv.br

Igor Rodrigues de Assis

Departamento de Engenharia Agrícola, Universidade Federal de Viçosa/UFV, Avenida Peter Henry Rolfs, s/n - Campus Universitário, Viçosa-MG, Brasil, 36.570-900, wilkermedeiros@yahoo.com.br, valente@ufv.br, queiroz@ufv.br, facpinto@ufv.br, igor.assis@ufv.br

*Autor para correspondência

Variable	Unit	Field 1	Field 2
pH	-	5.67	5.68
P	mg dm^-3	3.71	15.40
K	mg dm^-3	73.62	52.46
Ca²⁺	cmolc dm^-3	2.08	1.71
Mg²⁺	cmolc dm^-3	0.56	0.59
Al³⁺	cmolc dm^-3	0.07	0.04
H + Al	cmolc dm^-3	3.68	2.65
SB	cmolc dm^-3	2.83	2.44
CTC t	cmolc dm^-3	2.90	2.48
CTC T	cmolc dm^-3	6.51	5.09
V	%	43.14	47.88
M	%	3.98	2.02
OM	dag kg^-1	3.30	1.99
P-rem	mg L^-1	31.40	38.30
Sandy	%	53.84	65.76
Silt	%	14.44	13.08
Clay	%	31.72	21.16
Moisture	%	23.84	21.11
Altitude	m	671.21	452.93

Soil Attributes	Unit	---------------------Field 1-----------------------					---------------------Field 2--------------------
Soil Attributes	Unit	Mean	Min	Max	s¹ 1 s - standard deviation;	CV² 2 CV - coefficient of variation; pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CEC t - Effective cation exchange capacity; CEC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter Walkley-Black method (organic C × 1.724); P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al: KCl 1 mol/L extractor; H + Al: Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, mean value of the 25 sampling points in the 20 days of measurement	Mean	Min	Max	s	CV
pH	-	5.67	4.80	6.20	0.34	5.98	5.68	4.80	6.30	0.41	7.28
P	mg dm^-3	3.71	1.20	14.80	2.76	74.52	15.40	5.50	39.70	9.10	59.09
K	mg dm^-3	73.62	17.00	189.00	40.46	54.96	52.46	22.00	100.00	21.93	41.81
Ca²⁺	cmol_c dm^-3	2.08	0.60	3.50	0.69	33.10	1.71	0.70	3.00	0.58	33.92
Mg²⁺	cmol_c dm^-3	0.56	0.10	1.00	0.23	40.65	0.59	0.10	1.20	0.38	63.30
Al³⁺	cmol_c dm^-3	0.07	0.00	0.60	0.15	211.92	0.04	0.00	0.30	0.07	182.11
H + Al	cmol_c dm^-3	3.68	2.64	5.61	0.82	22.20	2.65	0.17	4.46	0.96	36.39
SB	cmol_c dm^-3	2.83	0.86	4.86	0.95	33.57	2.44	0.87	4.15	0.97	39.70
CEC t	cmol_c dm^-3	2.90	1.46	4.86	0.85	29.38	2.48	0.97	4.15	0.96	38.83
CEC T	cmol_c dm^-3	6.51	5.54	8.00	0.54	8.27	5.09	2.09	8.28	1.76	34.59
V	%	43.14	13.00	64.00	12.83	29.74	47.88	29.00	93.00	10.73	22.40
m	%	3.98	0.00	41.00	9.41	236.44	2.02	0.00	15.00	3.69	182.92
OM	dag kg^-1	3.30	2.40	4.50	0.45	13.66	1.99	1.10	3.00	0.48	24.00
P-rem	mg L^-1	31.40	22.00	36.70	3.57	11.35	38.30	27.30	48.10	5.64	14.73
Sand	%	53.84	49.00	66.00	3.72	6.90	65.76	38.00	82.00	15.93	24.22
Silt	%	14.44	6.00	22.00	4.03	27.92	13.08	3.00	30.00	8.95	68.41
Clay	%	31.72	16.00	41.00	5.05	15.93	21.16	11.00	34.00	7.68	36.29
Soil Moisture	%	23.84	18.52	29.43	2.87	12.03	21.11	8.44	43.57	12.32	58.35

Day of Evaluation	------------------------Field 1-----------------------			------------------------Field 2------------------------
Day of Evaluation	EC_a20	EC_a40	EC_a60	EC_a20	EC_a40	EC_a60
1	0.62	0.58	0.59	0.90	0.90	0.90
2	0.72	0.77	0.72	0.91	0.90	0.90
3	0.71	0.66	0.57	0.93	0.92	0.91
4	0.58	0.55	0.55	0.91	0.90	0.85
5	0.73	0.73	0.69	0.91	0.90	0.85
6	0.63	0.51	0.57	0.91	0.92	0.93
7	0.47	0.46	0.40^ns ns Non-significant (p>0.05). All of the other values were significant at p≤0.05	0.90	0.95	0.95
8	0.53	0.55	0.47	0.96	0.93	0.94
9	0.63	0.58	0.45	0.95	0.87	0.83
10	0.56	0.64	0.56	0.87	0.93	0.83
11	0.58	0.59	0.58	0.95	0.97	0.94
12	0.66	0.63	0.52	0.94	0.93	0.88
13	0.66	0.62	0.52	0.91	0.94	0.82
14	0.62	0.66	0.60	0.90	0.91	0.89
15	0.53	0.50	0.49	0.95	0.93	0.97
16	0.56	0.51	0.53	0.92	0.84	0.86
17	0.53	0.53	0.51	0.81	0.76	0.77
18	0.56	0.62	0.51	0.95	0.97	0.96
19	0.56	0.62	0.50	0.95	0.88	0.92
20	0.46	0.38^ns ns Non-significant (p>0.05). All of the other values were significant at p≤0.05	0.45	0.94	0.88	0.98

Soil Attributes	------------------------Field 1-------------------------			-------------------------Field 2------------------------
Soil Attributes	EC_a20	EC_a40	EC_a60	EC_a20	EC_a40	EC_a60
pH	0.57	0.52	0.53	-0.22^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	-0.14^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	-0.15^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement
P	0.65	0.63	0.64	-0.71	-0.66	-0.60
K	0.69	0.67	0.68	0.68	0.71	0.75
Ca²⁺	0.62	0.58	0.59	0.78	0.78	0.76
Mg²⁺	0.49	0.44	0.44	0.94	0.95	0.93
Al³⁺	-0.42	-0.40	-0.39	0.13^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	0.12^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	0.11^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement
H + Al	-0.54	-0.50	-0.51	0.80	0.81	0.82
SB	0.64	0.60	0.61	0.87	0.88	0.86
CTC t	0.64	0.60	0.60	0.89	0.89	0.88
CTC T	0.32	0.29	0.30	0.92	0.93	0.92
V	0.61	0.57	0.57	0.09^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	0.08^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	0.05^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement
m	-0.40	-0.37	-0.36	-0.09^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	-0.10^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	-0.10^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement
OM	0.16^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	0.09^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	0.08^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	0.88	0.88	0.87
P-rem	0.68	0.66	0.65	-0.94	-0.95	-0.93
Sand	-0.21^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	-0.22^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	-0.18^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	-0.96	-0.94	-0.89
Silt	0.54	0.55	0.58	0.92	0.92	0.87
Clay	-0.27^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	-0.28^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	-0.33^ns ns Non-significant (p > 0.05). All of the other values were significant at p ≤ 0.05. pH - hydrogen ion activity (1:2.5); P - phosphorous; K - potassium; Ca - Calcium; Mg - Magnesium; Al - Aluminum; H + Al - Potential acidity; SB - Sum of bases; CTC t - Effective cation exchange capacity; CTC T - Cation exchange capacity at pH 7; V - Base saturation; m - Aluminum saturation; OM - Organic matter; P-rem - Remaining phosphorous, P - K: Mehlich-1 Extractor; Ca - Mg - Al -KCl 1 mol/L extractor; H + Al - Calcium acetate 0.5 mol/L pH 7.0 extractor; Soil moisture, the mean value of the 25 sampling points in the 20 days of measurement	0.91	0.88	0.82

[1] *Autor para correspondência

Brasil

Brasil

Condutividade elétrica aparente do solo em dois tipos de solo

RESUMO