Agricultural Soil Mechanics

Penetration Resistance to Characterize the Depth and Persistence of Soil Loosening in Tillage Studies

“…This was probably related to soil consolidation under postseeding crop management operations in combination with increases in soil bonding due to wetting and drying process under the influence of plant roots (Koolen and Kuipers 1983 (Soane et al 1986). In this study, deep tillage loosened the soil to the 50-cm depth and elevated the soil surface 15 cm (Fig.…”

Soil Displacement and Soil Bulk Density Changes as Affected by Tire Size

“…In agricultural soils, compaction occurs including compression of the soil in the lateral direction (Koolen and Kuipers, 1983). Alakukku (1999) indicated that some of the factors affecting the compaction capability of wheel traffic are the soil condition during traffic, the type and intensity of the applied forces, the number of loading events, and their duration.…”

“…Alakukku (1999) indicated that some of the factors affecting the compaction capability of wheel traffic are the soil condition during traffic, the type and intensity of the applied forces, the number of loading events, and their duration. The strength of the soil is highly dependent on a number of parameters, including soil texture and structure, soil organic matter content, and, in particular, soil moisture content (Koolen and Kuipers, 1983;Dawidowski and Lerink, 1990;Horn and Lebert, 1994). In unsaturated soils, soil strength decreases progressively with increasing soil moisture content; this influences how traffic stresses are transmitted beneath the soil surface (Lamandé and SchjØnning, 2011b) and therefore the extent of soil deformation at depth (Arvidsson et al, 2001).…”

Compressibilidade de três Latossolos em função da umidade e uso

“…Gupta et al (1989) agruparam os modelos de compactação do solo em: (a) modelos baseados na técnica do elemento finito (Perumpral et al, 1969(Perumpral et al, , 1971Colleman & Perumpral, 1974;Pollock Jr. et al, 1986;Raper & Erbach, 1990a,b), e (b) modelos analíticos (Soehne, 1958;Gupta & Larson, 1982;Gupta et al, 1985;van den Akker & van Wijk, 1987). Gupta & Raper (1994) agruparam os modelos de compactação do solo nas seguintes categorias: (a) modelos baseados nas forças mecânicas provenientes de veículos agrícolas aplicadas à superfície do solo (Soehne, 1958;Trabbic et al, 1959;Gill & Vanden Berg, 1968;Koolen & Kuipers, 1983;Burt et al, 1989); (b) modelos baseados nas relações entre tensão e deformação do solo (Soehne, 1958;Dexter & Tanner, 1973;Amir et al, 1976;Gupta & Larson, 1982;Koolen & Kuipers, 1983;Grisso et al, 1987;Bailey & Johnson, 1989), e (c) modelos baseados na propagação das forças no solo os quais se subdividem em: (c.1) modelos baseados na técnica do elemento finito (Duncan & Chang, 1970;Perumpral et al, 1971;Pollock Jr. et al, 1986;Raper & Erbach, 1990a,b), e (c.2) modelos analíticos (Fröhlich, 1934;Soehne, 1958;Gupta & Larson, 1982;Boussinesq, 1985;Vanden Akker & van Wijk, 1987).…”