Atributos físico-hídricos do solo em lavoura de café conilon submetida à subsolagem
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Data
2013-02-21
Autores
Souza, Joabe Martins de
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Universidade Federal do Espírito Santo
Resumo
The proper preparation of the soil promotes changes in physical attributes, especially the structure and can modify the storage capacity of water, crucial in determining irrigation needs for crops. The aim of this study was to evaluate the
effects of soil preparation for planting Conilon coffee (Coffea canephora Pierre) submitted to subsoiling, physical properties and soil water. The experimental area consisted of three plots cultivated with coffee at 11, 7 and 3 years old, called T11, T7
and T3, respectively, submitted to subsoiling in the rows. For the evaluations hydrophysical soil samples were collected and undisturbed, in line (P1) and leading (P2) culture and four depths 0.00 to 0.20, 0.20-0.40, 0.40 -0.60, from 0.60 to 0.80 m. The experimental design was completely randomized design with three replications. The soil properties were evaluated soil bulk density, total porosity, macroporosity and microporosity, besides the water retention curve, saturated hydraulic conductivity, resistance to penetration and index S. The soil density, total porosity and macroporosity showed significant differences between the sampling points for the upper soil layers with higher porosity and macropore to the point P1 and a higher density of the soil to the point P2, did not differ from other layers. The total porosity showed an inverse behavior to the specific weight of the soil and increased the microporosity and macroporosity decrease in depth. Among the areas with different ages, physical and hydraulic properties of the soil showed no significant differences, showing that improvements of subsoiling are persistent over the years in this culture
condition. The penetration resistance differed between sampling points, occurring with increasing depth, no difference, however, between the plots. We observed a
positive correlation between penetration resistance and bulk density and microporosity, macroporosity and negative. The saturated hydraulic conductivity differ between sampling points in the layers of 0.00-0.40 m, with no significant difference between the plots. There was a negative correlation between penetration resistance and positive correlation with microporosity and macroporosity. The determination coefficient of adjustment curves water retention in the soil was greater than 98% and tuning parameters increased with depth. Water availability presented in general higher in the coffee line, until 0.60m, showing the benefit of subsoiling water retention. The S was higher in the rows, showing high correlation with the porosity and density of the soil. Subsoiling changed the physical and hydraulic properties of the soil, providing a balance between macro and micro, increased water availability and soil saturated hydraulic conductivity, and greater water retention at low voltages.
The S proved to be a good tool to assess soil quality under these conditions.
Descrição
Palavras-chave
Café conilon , Soil preparation , Coffea canephora , Coastal tableands , Preparo do solo , Retention curve , Tabuleiros costeiros , Hydraulic conductivity , Curva de retenção , Soil porosity , Condutividade hidráulica
Citação
SOUZA, Joabe Martins de. Atributos físico-hídricos do solo em lavoura de café conilon submetida à subsolagem. 2013. 75 f. Dissertação (Mestrado em Agricultura Tropical) - Programa de Pós-Graduação em Agricultura Tropical, Universidade Federal do Espírito Santo, São Mateus, 2013.