Aggregate stability and penetration resistance after mobilization of a dystrocohesive Ultisol

Tavares, Uilka E.; Rolim, Mario M.; Simões, Djalma E.; Pedrosa, Elvira M. R.; Magalhães, Adriana G.; Silva, Ênio F. de F. e

doi:10.1590/1807-1929/agriambi.v21n11p752-757

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ARTICLE • Rev. bras. eng. agríc. ambient. 21 (11) • Nov 2017 • https://doi.org/10.1590/1807-1929/agriambi.v21n11p752-757 copy

Aggregate stability and penetration resistance after mobilization of a dystrocohesive Ultisol

Estabilidade de agregados e resistência à penetração após mobilização de um Argissolo Amarelo distrocoeso

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Evaluation of mobilized soil profiles can provide important information on soil compaction reduction processes. In this context, the objective of this study was to evaluate alterations in soil penetration resistance and the impact on the aggregate stability of a cohesive Ultisol cultivated with sugarcane. The experiment was carried out at the Carpina Sugarcane Experimental Station (EECAC/UFRPE), located in the city of Carpina, PE. Penetration resistance, mobilized area and depth, and percentage of soil aggregates were evaluated before and after soil tillage. Soil mobilization improved soil aggregate uniformity and decreased penetration resistance in the 0-0.20 m layer. Coarse soil fraction, moisture and organic carbon positively contributed to the increase in soil mobilization.

Key words:
furrowing; harrowing; soil resistance

	Clay	Fine sand	Coarse sand	Silt	Ds g cm^-3	W_ST	θfc	K	Na	Ca	Mg	pH
	g kg^-1				Ds g cm^-3	%		cmol_c dm^-3				pH
0-0.20 m	130.41	214.47	511.06	140.85	1.41	13.74	9	0.13	0.06	2.1	1.3	5.1
0.20-0.40 m	137.79	212.86	517.71	130.38	1.59	13.74	10	0.07	0.03	1.8	0.8	4.8

	Ds g cm^-3	W %	OC dag kg^-1	PR MPa	MWD mm	FM
	0-0.20 m
Mean	1.43	11.99	1.68	2.73	2.77	3.27
Standard error	0.03	0.29	0.09	0.27	0.24	0.12
	0.20-0.40 m
Mean	1.61	13.33	1.48	2.89	1.61	2.69
Standard error	0.02	0.33	0.07	0.17	0.10	0.06

	Ds g cm^-3	W %	OC dag kg^-1	PR MPa	MWD mm	FM
0-0.20 m
P1V1	1.34 a	9.97 a	1.57 a	1.50 a	2.59 a	3.22 a
P1V2	1.39 a	9.43 a	1.55 a	1.47 a	2.46 a	3.19 a
P2V1	1.37 a	11.23 a	1.64 a	2.25 a	2.68 a	3.24 a
P2V2	1.34 a	12.35 a	1.65 a	2.40 a	2.92 a	3.37 a
Mean	1.36	10.75	1.6	1.91*	2.66*	3.26*
V1	1.44 a	10.59 a	1.6 a	1.87 a	2.63 a	3.23 a
V2	1.44 a	10.89 a	1.6 a	1.93 a	2.69 a	3.28 a
P1	1.44 a	9.69 b	1.56 a	1.48 b	2.52 a	3.2 a
P2	1.44 a	11.79 a	1.65 a	2.32 a	2.8 a	3.3 a
0.20-0.40 m
P1V1	1.58 a	12.83 a	1.35 a	2.48 a	1.87 ab	2.85 ab
P1V2	1.53 a	12.40 a	1.29 a	2.22 a	1.31 b	2.54 b
P2V1	1.60 a	12.48 a	1.26 a	2.46 a	1.62 ab	2.71 ab
P2V2	1.56 a	12.35 a	1.35 a	2.63 a	2.52 a	3.20 a
Mean	1.57	12.52	1.31	2.45	1.83	2.83
V1	1.63 a	12.41 a	1.29 a	2.4 a	1.75 a	2.78 a
V2	1.57 a	12.38 a	1.32 a	2.42 a	1.92 a	2.87 a
P1	1.63 a	12.38 a	1.3 a	2.28 a	1.59 a	2.7 a
P2	1.58 a	12.41 a	1.31 a	2.56 a	2.07 a	2.95 a

	T1	T2
	T1	P1	P2
0-0.20 m	2.73 a	1.48 bA	2.28 bB
0.20-0.40 m	2.89 a	2.32 aA	2.56 aA
Mobilized area	-	0.08 A	0.09 A
Profile depth	-	0.31 A	0.31 A

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[1] mario.rolim@ufrpe.br (Corresponding author)