Impact de l’intensification agricole (phoeniciculture) sur la variation du pH et du taux de calcaire total dans la région de Ghardaia (cas de Zelfana)

Abstract

Controlling soils quality in irrigated areas is an indispensable process to measure the sustainability of production system, as such the spatial variability of irrigated soils, is a way to know the evolution of the quality. The present work has been realized in the region of Zelfana, it is essentially relys on the evaluation of the impact of the date palm culture focusing on experimental values of some proprieties (pH, calcareous). Three plots of soil (cultivated, not cultivated under palm trees and outside of date palm culture were sampled according to a systematic grid of 8x8m. The analytical results illustrate that the soil is moderately to strongly calcareous and alkaline to very alkaline in the mentioned area , calcareous profile is increases during all the study; About pH profile, we mention that it increase in cultivated plot and decrease in the remaining plots. The analysis of the rate of annual variation of studied parameters showed a very highly significant increase of the calcareous and a very highly significant decrease of the pH. The spatial variation of calcareous is moderated in cultivated plot and high in bothun all study cultivated plots, while the pH is low rate in all study plots. Geostatistical modeling study of experimental variograms showed the effectiveness of the sampling chosen. The spatial and vertical variations of the calcareous and pH are influenced by the region of Zelfana.