Machinery traffic and cover crop effects on water infiltration rate in a Xanthic Hapludox<sup/>

Garcia Neto, Ernani; Umburanas, Renan Caldas; Outeiro, Vitor Hugo; Müller, Marcelo Marques Lopes; Rampim, Leandro; Tormena, Cassio Antônio; Pott, Cristiano Andre

doi:10.5935/1806-6690.20230049

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Scientific Article • Rev. Ciênc. Agron. 54 • 2023 • https://doi.org/10.5935/1806-6690.20230049 copy

Machinery traffic and cover crop effects on water infiltration rate in a Xanthic Hapludox¹ 1 Part of the first author’s dissertation, presented to Programa de Pós-Graduação em Agronomia, Universidade Estadual do Centro-Oeste, Guarapuava, Paraná. This study was funded by the Paraná State Araucária Foundation (Fundação Araucária, Brazil), Coordination for the Improvement of Higher Education Personnel (CAPES, Brazil), and National Counsel of Technological and Scientific Development (CNPq)

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The effects of machinery traffic and cover crops on soil physical properties have been underexplored under no-till agricultural production in subtropical environments. The objective of this study was to quantify the soil water infiltration rate and related soil physical properties in response to tractor traffic levels (0, 2, 5, and 20 passes) and the presence or absence of cover crops in a Xanthic Hapludox soil over two growing seasons under no-till conditions. The experiment was carried out in a randomized block design arranged in a factorial scheme with four replications. The traffic factor was constituted by the number of passes with a 6 Mg weight tractor. The winter crop management practices factor consisted of the cover crops (i) black oat (Avena strigosa) in 2017 and turnip (Raphanus sativus var. oleiferus) in 2018 compared with (ii) fallow with spontaneous vegetation. The soil water infiltration rate increased with cover crops when compared to fallow. Regarding tractor traffic levels, shortly after soil compaction, there was a lower water infiltration rate at 20 passes, 45 mm h^-1 lower than the absence of tractor traffic. The soil water infiltration rate was positively correlated with macroporosity and negatively correlated with soil bulk density. After 14 months of soil compaction caused by tractor traffic, an improvement in the soil physical properties and the water infiltration rate was found, which were enhanced by the inclusion of cover crops.

Keywords:
Green manure; Soil physical quality; Soil compaction; Double-ring pressure infiltrometer with constant load

Depth m	P(Mehlich-1) mg dm^-3	Organic matter g dm^-3	pH CaCl₂	Al	H+Al	Ca	Mg	K	CEC	SBS (%)	Clay	Silt	Sand
Depth m	P(Mehlich-1) mg dm^-3	Organic matter g dm^-3	pH CaCl₂	cmol_c dm^-3						SBS (%)	g kg^-1
0-0.2	5.2	16.1	4.8	0	5.2	2.2	1.8	0.3	12.6	45.7	748	215	37

Soil physical properties	Depth (m)	Machine traffic (nº passes)
Soil physical properties	Depth (m)	0	2	5	20
Soil bulk density (Mg m^-3)	0.00-0.05	1.00	1.13	1.15	1.18
	0.07-0.12	0.96	1.05	1.07	1.10
	0.17-0.22	1.01	1.03	1.03	1.09
Degree of compactness (%)	0.00-0.05	84	95	96	99
	0.07-0.12	80	87	89	92
	0.17-0.22	84	85	85	90
Macroporosity (m³ m^-3)	0.00-0.05	0.15	0.08	0.09	0.07
	0.07-0.12	0.20	0.12	0.11	0.10
	0.17-0.22	0.14	0.11	0.11	0.07
Microporosity (m³ m^-3)	0.00-0.05	0.47	0.51	0.50	0.50
	0.07-0.12	0.43	0.48	0.47	0.49
	0.17-0.22	0.48	0.50	0.51	0.53
Total porosity (m³ m^-3)	0.00-0.05	0.62	0.59	0.58	0.58
	0.07-0.12	0.63	0.61	0.59	0.59
	0.17-0.22	0.62	0.62	0.62	0.60

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[1] *Author for correspondence