CARACTERISATION PHYSICO-CHIMIQUE ET ESTIMATION DE LA STABILITE STRUCTURALE DES SOLS AGRICOLES DE LA REGION SIDI RAHAL, SAHEL (CHAOUIA COTIERE, MAROC)

The aim of this study is to characterize and evaluate the physical and chemical quality of agricultural soils irrigated with water from wells in the region of Sidi Rahal, Sahel (coastal Chaouia, Morocco). Thus, thirty soil samples (0 to 20cm of depth) was randomly taked from three agricultural stations and were treated for various physicochemical analyzes (texture, pH, organic matter, calcareous rate, structural stability). The results show siltysand soils with homogeneous texture, moderately basic pH (7.89 to 8.20), and 15.85% as carbonate rate. The organic material ranges from 0.3 to 2.5, the structural stability dry up and under water showed that those soils are usually unstable with a mean weight diameter (MWD) which ranges from 0.21 to 1.31 and stability index (SI) varying from 10.49 to 67.85

QUALITÉ AGRONOMIQUE DES TERRAINS AGRICOLES DE LA RÉGION DE JORF LASFAR (DOUKKALA, MAROC)

In order to highlight the changes that are made at the level of the quality of agricultural soils in the Jorf Lasfar area after the installation of various industrial units, we conducted a sampling companion during October 2014. Samplings were carried out following two horizons (0-2,5cm) and (2,5-10cm) in three stations. To assess the quality of agricultural soils in the region, we performed the physic-chemical analysis through the determination of some indicators namely: stability in dry and in water, pH, calcium carbonate (CaCO3%), Organic Matter (MO%) and Electrical Conductivity (CE mS/cm). The results obtained allowed to show that the index of aggregate stability is comparable in the three stations and it is in average of 30,61%, the pH is mildly alkaline in all stations with an average of 8.09, the rates of organic matter are more than 3% on average, while the average values of CE are low and do not exceed 0.98mS/cm calcium carbonates record values that vary on average from 10,90% to 11,38% in surface

CARACTERISATION PHYSICO-CHIMIQUE ET ESTIMATION DE LA STABILITE STRUCTURALE DES SOLS AGRICOLES DE LA REGION SIDI RAHAL, SAHEL (CHAOUIA COTIERE, MAROC)

The aim of this study is to characterize and evaluate the physical and chemical quality of agricultural soils irrigated with water from wells in the region of Sidi Rahal, Sahel (coastal Chaouia, Morocco). Thus, thirty soil samples (0 to 20cm of depth) was randomly taked from three agricultural stations and were treated for various physicochemical analyzes (texture, pH, organic matter, calcareous rate, structural stability). The results show siltysand soils with homogeneous texture, moderately basic pH (7.89 to 8.20), and 15.85% as carbonate rate. The organic material ranges from 0.3 to 2.5, the structural stability dry up and under water showed that those soils are usually unstable with a mean weight diameter (MWD) which ranges from 0.21 to 1.31 and stability index (SI) varying from 10.49 to 67.85

QUALITE PHYSICO-CHIMIQUE DES SOLS AGRICOLES DE LA REGION DE L’OULJA ENTRE SIDI ABED ET OULAD GHANEM (SAHEL DES DOUKKALA, MAROC)

The present work is a contribution to the characterization of agricultural soils in the region of Oulja (Sahel Doukkala) between Sidi Abed and Oulad Ghanem. This region is considered as a very important agricultural center, known nationally for its high potential of maraichere culture. However, once the plots are destined to these last, they know a significant regression, probably related to changes in soil quality. Therefore, a sampling compaign was done in October 2014 in three stations, in order to evaluate the agronomic quality of soil in the region. Soil quality has been appreciated through some physical and chemical indicators to know: pH, organic matter, calcium carbonates and structural stability in dry and in water. Results indicate that the pH is basic with grades ranging from 8.2 to 8.4 on average, calcium carbonate rates are high in the various stations and greatly exceed 23%, organic matter contents ranging on average of 2.5% to 4.11%, rate of unstable aggregation in water remains below 30%

The Effects of the Quality of Irrigation Water Used on Agricultural Soils in Coastal Chaouia, Morocco

The Coastal Chaouia region is located south of the Casablanca city (Morocco). Since the 1970s, groundwater has been used intensively for irrigation, previously for growing citrus and currently for vegetables and forages. The increase of irrigated soils by pumping has induced environmental problems such as the degradation of groundwater quality and salt water intrusion. For these reasons, this work aimed to study the impact of the irrigation water quality upon the agricultural soils. During the study, 71 samples of well water and soil were taken to represent the whole considered area, which comprised 3 different zones (0–1.8 km, 1.8–4.5 km, and 4.5–11 km from the coast). The analyzed parameters were salinity and pH. The results showed firstly that the soil pH average values decrease for the three zones with 7.73, 7.57, and 7.52, respectively. However, the water pH averages vary from 7.24 to 7.49. For the soil electrical conductivity, it represents a light decrease moving from the nearest zone to the sea to the far one (average of 3.54, 2.66, and 2.33, respectively). A similar result is for observed water electrical conductivity with average of 6.83, 5.30, and 2.06, respectively, for the three zones. The analyses of the soil and water salinity show that both salinities decreased moving from the coast to inland. Richard and Wilcox charts have confirmed the strong mineralization and the poor quality of most of the well water which are close to the sea