Spatial variability of soil salinity in an alluvial soil of the semi-arid region of Paraíba state

Revista Brasileira de Engenharia Agrícola e Ambiental

Queiroz, José Elenildo²  Gheyi, Hans Raj³  Souza, Lázaro Costa de¹ 

[1] UFPB, Patos;UFPB, Campina Grande

关键词: salinization;    exchangeable sodium percentage;    geostatistics    INTRODUÇÃO A salinidade do solo constitui um sério problema nas áreas irrigadas;    principalmente quando sua intensidade interfere no desenvolvimento das culturas;    reduzindo a produção e a produtividade das plantas;    a níveis antieconômicos (Oliveira;    1997);   

DOI  :  10.1590/S1415-43662000000100007

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

The objective of this work was to study the spatial variability of pH of saturation paste (pHsp), the electrical conductivity of saturation extract (ECe) and the exchangeable sodium percentage (ESP) in an alluvial salt affected soil. Soil samples were collected in 0 - 20, 20 - 40 and 40 - 60 cm depths, in an area of the Irrigation Project of Capoeira, located in São José do Bonfim - Paraíba (Brazil), following a systematic scheme of sampling in a 10 x 15 m mesh. The data were analyzed through the descriptive statistics and geostatistics. Low variability was observed for the pHsp (CV<12%) in constrast to ECe and ESP (CV> 60%). Spherical and gaussian models were adjusted to the experimental semivariograms of the variables that presented a spatial dependence structure. Structures of spatial dependence, with range varying from 20 to 40 m were observed. The maps of isohypsas of the combination of ECe and ESP allowed the visualization of the pattern of the salinity and sodicity variability, constituting a tool for the definition of soil management and reclamation of the affected area.

【 授权许可】

CC BY-NC