Olive oil elemental content of two local genotypes as influenced by recycled effluent irrigation under arid environment
2009
Al-Absi, K.M. | Mohawesh, O.E.
Effect of recycled effluent irrigation was investigated on quality, elemental composition (Ca, Cd, Co, Fe, K, Mn, Mg, Na, Pb Cl and Zn) and of two local olive genotypes (Olea europaea L.) under field conditions during two complete vegetative cycles. The analysis of the effluent indicated that element concentrations fall within the permissible range for irrigation except Na and Mg. The Ca, Cl, K, Mn, Na and Zn were found in all oils of trees irrigated with wastewater and fresh water. However, the concentration of these elements was higher in the olive oil of trees irrigated with treated wastewater than olive oil of trees irrigated with fresh water but lower than the maximum permissible concentration. The concentrations ranged from 8.90 to 26.15 mg kg. 1 for Ca; 0.07 to 0.13 % for Cl; 53.19 to 111.75 mq kg . 1 for K, 0.97 to 1.46 mg kg. 1 for Mn; 6.24 to 16.10 mg kg. 1 for Na and 0.19 to 0.36 mg kg. 1 for Zn. The effect of irrigation water quality on oil quality indices (peroxide and acidity) was not significant. There were significant correlations between the concentrations of the pairs Ca-Na, Zn. These results indicate that this kind of effluent is suitable for irrigation of olive genotypes grown for oil purposes.
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