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| Fidalski,Jonez; Auler,Pedro Antonio Martins; Beraldo,José Marcos Garrido; Marur,Celso Jamil; Faria,Rogério Teixeira de; Barbosa,Graziela Moraes de Cesare. |
| The increased availability of soil water is important for the management of non-irrigated orange orchards. The objective of this study was to evaluate the availability of soil water in a Haplorthox (Rhodic Ferralsol) under different tillage systems used for orchard plantation, mulch management and rootstocks in a "Pêra" orange orchard in northwest Paraná, Brazil. An experiment in a split-split-plot design was established in 2002, in an area cultivated with Brachiaria brizantha grass in which three tillage systems (no tillage, conventional tillage and strip-tillage) were used for orchard plantation. This grass was mowed twice a year between the rows, representing two mulch managements in the split plots (no mulching and mulching in the plant rows). The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brachiaria brizantha; No tillage; Soil management; Soil texture; Time domain reflectometry. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000300033 |
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| Carvalho,Daniel F. de; Silva,Dione G. da; Rocha,Hermes S. da; Almeida,Wilk S. de; Sousa,Eraldo da S.. |
| The aim of this study was to quantify the water consumption and the crop coefficients (Kc) for the potato (Solanum tuberosum L.), in Seropédica, Rio de Janeiro (RJ), Brazil, under organic management, and to simulate the crop evapotranspiration (ETc) using the Kc obtained in the field and the ones recommended by the Food and Agriculture Organization (FAO). The water consumption was obtained through soil water balance, using TDR probes installed at 0.15m and 0.30m deep. At the different stages of development, the Kc was determined by the ratio of ETc and reference evapotranspiration, obtained by Penman-Monteith FAO 56. The crop coefficients obtained were 0.35, 0.45, 1.29 and 0.63. The accumulated ETc obtained in the field was 109.6 mm, while the ETc... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solanum tuberosum L.; Time domain reflectometry; Irrigation. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000100020 |
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| Teixeira,W. G.; Schroth,G.; Marques,J. D.; Huwe,Bernd. |
| Volumetric soil water content (theta) can be evaluated in the field by direct or indirect methods. Among the direct, the gravimetric method is regarded as highly reliable and thus often preferred. Its main disadvantages are that sampling and laboratory procedures are labor intensive, and that the method is destructive, which makes resampling of a same point impossible. Recently, the time domain reflectometry (TDR) technique has become a widely used indirect, non-destructive method to evaluate theta. In this study, evaluations of the apparent dielectric number of soils (epsilon) and samplings for the gravimetrical determination of the volumetric soil water content (thetaGrav) were carried out at four sites of a Xanthic Ferralsol in Manaus - Brazil. With the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon; Oxisols; Time domain reflectometry; Dieletric properties. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832003000400001 |
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| Costa,Carlos Alexandre Gomes; Lopes,José Wellington Batista; Pinheiro,Everton Alves Rodrigues; Araújo,José Carlos de; Gomes Filho,Raimundo Rodrigues. |
| The purpose of this study was to represent the soil moisture in the profile corresponding to the root zone from TDR sensors in a preserved area of the Caatinga biome and analyze the spatialized moisture adjustment equations under different layers of the soil profile. For that, we analyzed three classes of soil (red yellow Ultisol; Hypochromic Luvisol; Udorthent) in the Aiuaba Experimental Watershed, located in the semiarid zone of northeastern Brazil. The hydro-physical parameters representing the soil water retention (field capacity, wilting point and residual moisture) were collected in four campaigns, in six points and in the profiles corresponding to the effective root depth, totaling 216 samples. For the evaluation of the regression models, we used... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Caatinga; Soil; Time domain reflectometry. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000400004 |
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