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Impact de différentes doses d'irrigation par les eaux usées épurées par infiltration percolation sur une culture de pomme de terre : Solanum tuberosum. Réponse physiologiques et agronomiques

Alaoui, Sidi Mohammed

Tesi Istituto Agronomico Mediterraneo <Bari> 2003

Résumé

This work took place in the experimental plot of the wastewater treatment station of DRARGA to investigate the eco-physiological and agronomic responses of potato crop to four irrigation regimes: 120%ETM, 100%ETM, 80%ETM and 60%ETM. The crop adapted to each irrigation regime. The EC of the saturation extract increased from 1.86 dS/m respectively to 1.93; 1.96; 1.98 and 2.12 dS/m for the treatments 120%, 100%, 80%, and 60% ETM. The soil was richer in nitrogen and potassium but poor in phosphorus.The wastewater use reduced net photosynthesis rate and the transpiration rate. The osmotic potential reduced from -18,58 ±0,61bar in 120%ETM treatment to -23,74±2,25 bar in 60%ETM treatment. The increased water application yielded larger leaf area, high fresh weight and greater water use efficiency. For 120% ETM regime, the quantity of leached nitrates was about 20 Kg/ha, thus representing a low potential hazard of groundwater pollution.