Caracterização físico-hídrica de um perfil de terra roxa estruturada latossólica pelo método do perfil instantâneo

Costa, Antônio Carlos Saraiva da; Libardi, Paulo Leonel

doi:10.1590/s0100-06831999000300021

Cited by 5 publications

(6 citation statements)

References 7 publications

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“…In the Bt2 horizon of P1, the presence of clay skins coating surface of aggregates and the blocky structure may be related to illuvial clays Libardi, 1999). The surface horizons of the profiles studied showed weak or moderate structure, small to medium, granular or crumb, condition associated with increase of organic matter on the soil surface.…”

Section: Resultsmentioning

confidence: 86%

Soil Variability in Different Landscape Positions in the Porto Alegre Botanical Garden, Southern Brazil

et al. 2015

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Knowledge of soil characteristics in areas where activities related to the environment are developed, such as Porto Alegre Botanical Garden (JB-PoA), is a fundamental condition for the sustainable use of this natural resource. The objective of this study was to characterize, classify and evaluate some issues about soil formation in Porto Alegre Botanical Garden, as well as relate their distribution on the landscape according to environmental characteristics. For the morphological description and collecting samples four profiles were selected (P1 to P4), located in the summit-shoulder transition, backslope, footslope and toeslope, respectively. Granulometric distribution of the P1 and P3 profiles indicated sharp textural gradient, with presence of textural and "plânico" B horizons, respectively, according to Brazilian System of Soil Classification. There is predominance of low values of pH, and low base saturation, with exception of P4, indicating probable deposition of solution material at this area. The Fed/Fes relationship was greater in the profile located in the summit-shoulder transition (P1), indicating higher weathering. The Feo/Fed relationship increased in P3 and P4 profiles, indicating greater participation of iron oxides of low crystallinity in reducing environment. The occurrence of some pedogenic processes may be inferred, like lessivage in P1 (Ultic Hapludalf), due to clay skins and higher values of fine clay:total clay relationship in subsurface; ferrolysis and gleization, by low pH value and high Feo/Fed relationship in E and EB horizons of P3 (Oxyaquic Hapludalf), being the last also present in P4 (Humaqueptic Endoaquent), indicating gleization occurrence.

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Section: Resultsmentioning

confidence: 86%

Soil Variability in Different Landscape Positions in the Porto Alegre Botanical Garden, Southern Brazil

et al. 2015

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“…A esta profundidade, o solo tem uma característica bem diferente da de 0,20 m e esta estrutura mais endurecida, média e grande bloco subangular forte; com cerosidade forte e abundante (Costa & Libardi, 1999), pode ter contribuído para que os experimentos a essa profundidade fossem bem mais demorados, apesar da observação de um menor volume de água infiltrada. Antonino et al (1995), no seu trabalho, onde foram estudadas três profundidades de um solo essencialmente arenoso, também observaram a diminuição nos valores das propriedades hidráulicas quando considerando as maiores profundidades.…”

Section: Resultsunclassified

Propriedades hidráulicas de um solo não saturado utilizando-se o permeâmetro a disco

Silva

Libardi

2000

Sci. agric. (Piracicaba, Braz.)

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, a 0,40 m, com texturas francoargilosa e argilosa, respectivamente. Para a determinação da condutividade hidráulica, K, utilizou-se a equação de Wooding, enquanto a sorvidade, S, foi determinada a partir da regressão da porção linear do gráfico da infiltração acumulada (I) versus a raiz quadrada do tempo (t 1/2 ). Os valores obtidos da variação de umidade e da sorvidade refletem a alteração das condições iniciais do solo, tais como umidade inicial e estrutura superficial. Como esperado para um solo mais denso, para a profundidade de 0,40 m, os valores encontrados foram menores que os obtidos para 0,20 m. O solo, a esta profundidade, possui características estrutural e textural bem diferentes das de 0,20 m, com a sua superfície apresentando-se bastante endurecida, com grandes volumes mais adensados, formados por blocos compactados, entremeados por porções mais soltas. Palavras-chave: condutividade hidráulica, sorvidade, permeâmetro a disco HYDRAULIC PROPERTIES OF AN UNSATURATED SOIL USING THE DISK PERMEAMETERABSTRACT: Soil sorptivity (S) and unsaturated soil hydraulic conductivity (K) determinations are of fundamental importance to understand the soil water infiltration process. These properties were determined from disk permeameter ( . K was determined using the Wooding equation, whereas the sorptivity S was determined from the linear portion of the curve of cumulative infiltration (I) versus square root of time (t 1/2 ). As expected, the values for the depth of 0.40 m were smaller than those for the depth of 0.20 m, because the soil properties (structure and texture) at the greater depth were quite different than those at 0.20 m, presenting large hardened soil aggregates intermediated by smaller softer ones, a common feature in textural horizons.

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“…Bulk density values were high in the surface horizons (1.52 Mg m -3 , on average) and subsurface (average of 1.67 Mg m -3 ) of the studied profiles, especially larger on the surface of the Bt horizon. This may be related to the formation of a compressed layer by desiccation of horizon, and the plastic deformations induced by soil water behavior (Costa and Libardi, 1999). The depth of occurrence does not indicate compaction due to agricultural practices.…”

Section: Discussionmentioning

confidence: 97%

Relief Position and Soil Properties under Continuous Banana Cropping in Subhumid Climate in Northeast Brazil

Almeida

Araújo

Filho

et al. 2019

Rev. Bras. Ciênc. Solo

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Sequences of thick and eroded soils in hills surfaces are cultivated with banana since the beginning of the last century in the Northeast of Pernambuco (PE), Brazil. Measurements of soil properties depending on soil slope under intensive agricultural cultivation are limited mostly as the pedogenetic approach. This study aimed to identify the dominant soil types, to evaluate morphological, physical, chemical, and mineralogical properties of soil profiles, and link them to the relief position under continuous banana cropping, in the transition Mata-Agreste of PE. Three slope classes and soil profiles were considered: Profile 1 (P1), upper third of the elevation slope; Profile 2 (P2), middle third of the slope; and Profile 3 (P3) lower third. They were opened, described, and soil samples collected from all horizons at a typical slope of the region. Independent of relief position and land use, all soils are deep (>1.50 m) and present the argic horizons (Bt) developed in all steeply sloping surfaces (15-33 %). The Bt horizon presented the highest values of soil bulk density and microporosity. Despite the presence of illite, all the soil profiles showed remarkable degree weathering, are mostly kaolinitic, besides presenting goethite and quartz in the soil clay fraction, and predominance of quartz in the silt and sand fraction. Water-stable aggregates >2 mm were dominant in all the relief positions. Acidity, low cation exchange capacity, and in general, nutrient poverty were observed in the soil profiles, as opposed accumulation of exchangeable cations on the lower third of the slope (P3). However, the soil properties were affected by land use and water erosion. The Ap horizons showed the highest values of pH, exchangeable bases, phosphorus available, and organic carbon due to agricultural practices, while the steepest slope (P2) had the lowest content of clay, phosphorus and mean weight diameter of aggregates, and higher organic carbon content, in the superficial horizon, due to removal and deposition by water erosion. From the upper third to the lower third of the slope, Nitic Acrisol, Haplic Acrisol, and Nitic Lixisol were formed.

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Caracterização físico-hídrica de um perfil de terra roxa estruturada latossólica pelo método do perfil instantâneo

Abstract: RESUMO Em Terra Roxa Estruturada Latossólica do município de Piracicaba (SP), foram instalados tensiômetros a cada

Cited by 5 publications

References 7 publications

Soil Variability in Different Landscape Positions in the Porto Alegre Botanical Garden, Southern Brazil

Soil Variability in Different Landscape Positions in the Porto Alegre Botanical Garden, Southern Brazil

Propriedades hidráulicas de um solo não saturado utilizando-se o permeâmetro a disco

Relief Position and Soil Properties under Continuous Banana Cropping in Subhumid Climate in Northeast Brazil

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