Assessment of Heavy Metals Pollution for Cultivated Soils, Irrigated by Several Irrigation Waters Varying in their Qualities in Al-Hassa Oasis, Kingdom of Saudi Arabia

Twenty-four composite surface soil samples (0-30cm depth) representing cultivated soils irrigated for long periods of time (more than fifteen years) with various irrigation water qualities: (i-ground water (GW), ii-ground water + agricultural drainage water (DW), iii-ground water + tertiary treated

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