Caracterização das propriedades térmicas do solo de Lagoa Seca-PB.

Abstract

The variation of soil temperature which a plant can support is relatively wide, however, its development is seriously compromised from the moment in that the soil begins to assume temperatures below or above certain limits values. Until then, although it is known that soil temperature is one of environmental factor of greatest importance to agriculture, few studies on this variable were performed by the scientific community for soils of Brazil. Therefore, this research aims to investigate the spatial-temporal variability of temperature and soil thermal diffusivity of Lagoa Seca-PB, from data obtained throughout the year 2010 and 2011. To achieve this objective it was using temperature sensors, programmed to operate continuously over the daily cycles, installed in four different soil depths. In order to estimate the magnitude of soil thermal diffusivity were employed three different methods. From the results, verified that the soil thermal behavior observed in both years are quite similar, especially with respect to the hours and months of occurrence of maximum and minimum temperatures. The arctangent method, to the specific case of layer between 05 and 50cm depth, is not adequate for the estimation of this physical greatness.