Variabilidade espacial da matéria orgânica dos solos do perímetro irrigado Engenheiro Arcoverde no município de Condado, PB.

Abstract

Soils that are submitted to agricultural practices, irrigation and/or fertilizing, may present spatial variability of their physical or chemical attributes. The objective of this work was to strudy the spatial variability of the organic matter (OM), at three depth intervals, 0-20, 20-40 and 40- 60 cm, of a irrigated soil. For this, it was used classic statistics techniques and geoestatistics. The work was conducted at the Engenheiro Arcoverde Irrigated Perimeter located on the municipal district of Condado, PB. One hundred and sixty six soil samples were collected on 52 sampling points in a randomized sampling squeme. For the classic statistical analysis the OM in the three depths, presented low standard deviation and medium variation coefficients, indicating some spatial variability. The Geostatictics analysis indicated presence of structure of spatial dependence for the depths. The semivariograms permitted interpolation of data throughout kgriging. The semivariograms showed exponential structures for all the depths. The isoline maps allowed to evaluate the soil OM patterns of the variability, constituting an excellent tool for the definition of managing strategies and recovery of the area in study.