Apparent electrical conductivity in dry versus wet soil conditions in a shallow soil

摘要: The general objective of this study was to evaluate the stability patterns apparent soil electrical conductivity (ECa) in dry versus wet conditions a shallow typically used for pastures Mediterranean southern region Portugal. A 6 ha experimental field permanent bio-diverse pasture divided into 76 squares 28 × m. measured using Dualem 1S sensor under (June 2007) and during rainy season (March 2010). Soil samples, geo-referenced with GPS, were collected depth range 0–0.30 characterized terms bedrock depth, moisture content, texture, pH, organic matter macronutrients (nitrogen, phosphorus, potassium). Pasture also measure yield. statistical analysis between resulted linear significant correlation coefficient (R = 0.88). results showed relative elevation −0.64 R −0.66), yield 0.42 0.48), 0.40 0.27), pH 0.50 0.49), silt 0.27 0.38) content 0.48 0.45), conditions, respectively. multi-variate regression carried out following parameters that ECa did not present multi-collinearity: content. showed, 0.75 0.84, respectively). Overall, these indicate temporal different contents, which is relevant respect time when should be surveyed important sensor, as decision support tool management zones precision agriculture.