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Infiltracao da água em solos aluviais com cacau em Linhares, Espírito Santo

by Cadima Zevallos, A.
Publisher: Abr-Jun 1988Subject(s): SUELOS DE CACAO | CONTENIDO DE AGUA EN EL SUELO | BALANCE HIDRICO DEL SUELO | ESPIRITO SANTO | BRASIL | SOIL WATER CONTENT | SOIL WATER BALANCE | ESPIRITO SANTO | BRAZIL | TENEUR EN EAU DU SOL | BILAN HYDRIQUE DU SOL | ESPIRITO SANTO | BRESIL In: Revista Theobroma (Brasil) v. 18(3) p. 165-180Summary: In the Filogonio Peixoto Experimental Station, situated in the Rio Doce basin, in Linhares, Espirito Santo, Brazil, the hydraulic conductivity, matric suction and volumetric moisture were determined in an Alluvial soil (Entisol) by the instantaneous profile method under field conditions. Total soil water potential was measured through tensiometers installed in three experimental plots at the depths of 15, 30, 45, 60, 75, 90, 105, 120 and 135 cm. Soil water content was calculated from soil water retention curves of undisturbed soil cores from all depths. The reading at the nine depths were done at different intervals (first at half an hour, then every hour for 12 hours and the one determination daily). The non-saturated hydraulic conductivity, calculated for each 15 cm depth, was 9.941, 0.215, 0.040 and 0.007 cm day exponent -1 after half an hour, one day, five days and forty days, respectively. The spatial variability of soil hydraulic conductivity was observed to be more pronounced at surface layers, being less important at greater depths. It was concluded that, for dephts greater than 45 cm, average values of soils hydraulic conductivity could be used with more confidence in the estimation of soil water flows in water balance studies.
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In the Filogonio Peixoto Experimental Station, situated in the Rio Doce basin, in Linhares, Espirito Santo, Brazil, the hydraulic conductivity, matric suction and volumetric moisture were determined in an Alluvial soil (Entisol) by the instantaneous profile method under field conditions. Total soil water potential was measured through tensiometers installed in three experimental plots at the depths of 15, 30, 45, 60, 75, 90, 105, 120 and 135 cm. Soil water content was calculated from soil water retention curves of undisturbed soil cores from all depths. The reading at the nine depths were done at different intervals (first at half an hour, then every hour for 12 hours and the one determination daily). The non-saturated hydraulic conductivity, calculated for each 15 cm depth, was 9.941, 0.215, 0.040 and 0.007 cm day exponent -1 after half an hour, one day, five days and forty days, respectively. The spatial variability of soil hydraulic conductivity was observed to be more pronounced at surface layers, being less important at greater depths. It was concluded that, for dephts greater than 45 cm, average values of soils hydraulic conductivity could be used with more confidence in the estimation of soil water flows in water balance studies.

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