INVESTIGADORES
IMHOFF Silvia Del Carmen
artículos
Título:
Estimativa da capacidade de suporte de carga do solo a partir da avaliação da resistência à penetração
Autor/es:
LIMA, C.L.R.; DA SILVA, ALVARO PIRES; IMHOFF, S.; LEÃO, T
Revista:
REVISTA BRASILEIRA DE CIêNCIA DO SOLO
Editorial:
SBCS
Referencias:
Lugar: Vicosa; Año: 2006 vol. 30 p. 217 - 223
ISSN:
0100-0683
Resumen:
Increment in pasture productivity has been associated with the understanding of the
soil behavior under compression. The objective of this research was to quantify (a) the
compression curves and (b) the preconsolidation pressure of the soils under non-irrigated
and irrigated short duration grazing systems. Ninety-six undisturbed soil samples were
taken from the four successive pasture cycles of Tanzania grass (Panicum maximum Jacq.)
in a Hapludalf. The samples were saturated in water and equilibrated at the matrix potential
(y): -10 kPa and then were weighed and submitted to an uniaxial compression test, applying
the following pressures: 25, 50, 100, 200, 400, 600, 800, 1,000, 1,300, and 1,600 kPa. Results
support the hypothesis that there is a difference between the soil compressibility under nonirrigated
and irrigated short-duration grazing systems. The higher initial compaction
verified in irrigated short-duration grazing system favored the displacement of the uniaxial
compression curves for higher bulk density values. The preconsolidation pressure was
significantly higher in the fourth pasture cycle under irrigated than under the non-irrigated
short duration grazing system.
the following pressures: 25, 50, 100, 200, 400, 600, 800, 1,000, 1,300, and 1,600 kPa. Results
support the hypothesis that there is a difference between the soil compressibility under nonirrigated
and irrigated short-duration grazing systems. The higher initial compaction
verified in irrigated short-duration grazing system favored the displacement of the uniaxial
compression curves for higher bulk density values. The preconsolidation pressure was
significantly higher in the fourth pasture cycle under irrigated than under the non-irrigated
short duration grazing system.
in a Hapludalf. The samples were saturated in water and equilibrated at the matrix potential
(y): -10 kPa and then were weighed and submitted to an uniaxial compression test, applying
the following pressures: 25, 50, 100, 200, 400, 600, 800, 1,000, 1,300, and 1,600 kPa. Results
support the hypothesis that there is a difference between the soil compressibility under nonirrigated
and irrigated short-duration grazing systems. The higher initial compaction
verified in irrigated short-duration grazing system favored the displacement of the uniaxial
compression curves for higher bulk density values. The preconsolidation pressure was
significantly higher in the fourth pasture cycle under irrigated than under the non-irrigated
short duration grazing system.
the following pressures: 25, 50, 100, 200, 400, 600, 800, 1,000, 1,300, and 1,600 kPa. Results
support the hypothesis that there is a difference between the soil compressibility under nonirrigated
and irrigated short-duration grazing systems. The higher initial compaction
verified in irrigated short-duration grazing system favored the displacement of the uniaxial
compression curves for higher bulk density values. The preconsolidation pressure was
significantly higher in the fourth pasture cycle under irrigated than under the non-irrigated
short duration grazing system.
Panicum maximum Jacq.)
in a Hapludalf. The samples were saturated in water and equilibrated at the matrix potential
(y): -10 kPa and then were weighed and submitted to an uniaxial compression test, applying
the following pressures: 25, 50, 100, 200, 400, 600, 800, 1,000, 1,300, and 1,600 kPa. Results
support the hypothesis that there is a difference between the soil compressibility under nonirrigated
and irrigated short-duration grazing systems. The higher initial compaction
verified in irrigated short-duration grazing system favored the displacement of the uniaxial
compression curves for higher bulk density values. The preconsolidation pressure was
significantly higher in the fourth pasture cycle under irrigated than under the non-irrigated
short duration grazing system.
the following pressures: 25, 50, 100, 200, 400, 600, 800, 1,000, 1,300, and 1,600 kPa. Results
support the hypothesis that there is a difference between the soil compressibility under nonirrigated
and irrigated short-duration grazing systems. The higher initial compaction
verified in irrigated short-duration grazing system favored the displacement of the uniaxial
compression curves for higher bulk density values. The preconsolidation pressure was
significantly higher in the fourth pasture cycle under irrigated than under the non-irrigated
short duration grazing system.
y): -10 kPa and then were weighed and submitted to an uniaxial compression test, applying
the following pressures: 25, 50, 100, 200, 400, 600, 800, 1,000, 1,300, and 1,600 kPa. Results
support the hypothesis that there is a difference between the soil compressibility under nonirrigated
and irrigated short-duration grazing systems. The higher initial compaction
verified in irrigated short-duration grazing system favored the displacement of the uniaxial
compression curves for higher bulk density values. The preconsolidation pressure was
significantly higher in the fourth pasture cycle under irrigated than under the non-irrigated
short duration grazing system.