Avaliação da disponibilidade de água para plantas em solos de sucessivas barragens subterrâneas na zona rural de Campina Grande, PB.

Abstract

In this work was evaluated the water availability for plants in soils from consecutives subterranean dams (in dry season, December/2004 and rainy season, April/2005). The soils samples were collected on Angico stream, located in the medium Paraiba region, community of Paus Brancos, rural district of Campina Grande – PB. The values of the total water available for plants were obtained using the field capacity minus the wilting point values contained in soil. It were collected a total of 342 samples of soil, in December of 2004, 171 of them to determinate the total water quantity in the soil. In April of 2005, the 171 samples of soil were collected again, in the same place, distanced around 1,5m to 3m of the points where was made the previous collects, one year ago, and orientated by pickets. In general, it was observed that the mediums values of the soil water availability in the subterranean dams are positives, but with a detail; the values are much higher than the water availability for plants, when it were analyzed at upstream area (witness) which had a smaller average.