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| PARAHYBA,ROBERTO DA B.V.; ARAÚJO,MARIA DO SOCORRO B. DE; ALMEIDA,BRIVALDO G. DE; ROLIM NETO,FERNANDO C.; SAMPAIO,EVERARDO V.S.B.; CALDAS,ANILDO M.. |
| Abstract: One of the most serious problems in areas indicated for irrigation projects in the Brazilian Northeast region is the occurrence of sandy soils, known to have low moisture retention, but occurring in strategic locations in terms of water supply and geographical situation, and which can be used for agricultural purposes. The objective of this study was to evaluate the influence of particle size distribution and porosity on the water retention capacity of sandy soils in the semiarid area of the Northeast region. Soil bulk and particle densities, total porosity (macro, meso and microporosity), field capacity, permanent wilting point and soil-water retention curve were determined in samples of surface (A) and subsurface (C or Bw) horizons of ten... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil-water retention curve; Microporosity; Pore-size distribution; Sandy soils. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700860 |
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| Caviglione,João H.. |
| ABSTRACT From the 1990s, the demand for soil quality indicators has increased with the agricultural sustainability approaches. The S-index was proposed as an indicator of soil physical quality. The objective was to evaluate the sensitivity of S-index as an indicator of soil physical quality and its correlation with bulk density, organic carbon content, macroporosity, microporosity, total porosity and clay, sand and silt contents, under field conditions in the diversity of the Paraná state. Samples were collected from 21 sites with textures from clay and heavy clay, in the layers of 0-0.1 and 0.1-0.2 m, in soil under native forest and in cultivated soil. Eight soil physical attributes were determined. A soil-water retention curve with six moisture points... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil-water retention curve; Soil structure; Soil porosity; Van Genuchten-Mualem. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000700458 |
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