Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/14633
Tipo: Artigo
Título: Soil compressibility under irrigated perennial and annual crops in a semi-arid environment
Autor(es): Neves, Júlio César Lima
Watanabe, Rafaela
Figueiredo, Getulio Coutinho
Silva, Álvaro Pires da
Oliveira, Teogenes Senna de
Abstract: In irrigated soils, a continuous state of high moisture reduces resistance of the soil to applied external forces, favouring compaction. The aim of this study was to evaluate the susceptibility to compaction of developed calcareous soils in irrigated annual and perennial cropping systems of the Apodi Plateau, located in the Brazilian semi-arid region. Four areas of irrigated crops were evaluated: banana after two (B2) and 15 (B15) years cultivation, pasture (P), and a corn and beans succession (MB), as well as the reference areas for soil quality and corresponding natural vegetation (NVB2, NVB15, NVP and NVMB). Samples were collected at layers of 0.00-0.10 and 0.20-0.30 m; and for B2 and B15, samples were collected in the row and inter-row spaces. The following properties were determined: degree of compactness (DC), preconsolidation pressure (σp), compression index (Cc), maximum density (ρmax), critical water content (WCcrit), total organic carbon (TOC) and carbon of light organic matter (Clom). Mean values were compared by the t-test at 5, 10, 15 and 20 % probability. An increase was seen in DC at a layer of 0.20-0.30 m in MB (p<0.15), showing the deleterious effects of preparing the soil by ploughing and chiselling, together with the cumulative traffic of heavy machinery. The TOC had a greater influence on ρmax than the stocks of Clom. Irrigation caused a reduction in Cc, and there was no effect on σp at field capacity. The planting rows showed different behaviour for Cc, ρmax, and WCcrit,, and in general the physical properties displayed better conditions than the inter-row spaces. Values for σp and Cc showed that agricultural soils display greater load-bearing capacity and are less susceptible to compaction in relation to soils under natural vegetation.
Palavras-chave: irrigated agriculture
Soil quality
Load capacity
Trampling by animals
Editor: Revista Brasileira de Ciência do Solo
Tipo de Acesso: Open Access
URI: http://dx.doi.org/10.1590/18069657rbcs20160206
http://www.locus.ufv.br/handle/123456789/14633
Data do documento: 5-Jan-2017
Aparece nas coleções:Solos - Artigos

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