Variabilidade espacial da água disponível, micro-bacia do Rio Cabelo do município de João Pessoa (PB).

Abstract

The objective of the present work was to evaluate the spatial variability of the soil texture, field capacity (θcc), permanent wilting point (θpwp) and available water of the soil for plants (AW) using classical statistics and geoestatistics. For this, soil samples were collected at three soil depth intervals (0-30, 30-60 and 60-90cm) from the Cabelo River Microbasin area, located in João Pessoa, State of Paraíba. It was observed a small spatial variability for the sand, silt and clay contents, θcc, θpwp and AW, confirmed by the low standard deviation (less than 2.5) and variation coefficient (less than 82%), values these increasing with soil depth. Spherical exponential models were adjusted to the experimental studied variables semivariogram, with a spatial dependence which allowed data interpolation obtaining alcances from 627 to 14133 m for the AD values. The isolines maps of the available water for plants allowed the identification of soil water content variability patterns, constituting this a very important tool for the definition of irrigation management strategies.