Effect of irrigation by treated domestic wastewater instead of well water on essential oil content in coriander (CoriandrumsativumL.) verities

Author(s): Touraj Rahimi, Hossein Aliabadi Farahani, Hossein Hassanpour Darvishi

In this experiment, we had 15 lysimeters, thatwere planted coriander (Shahre Rey variety) in 1 to 5 lysimeters and were irrigated by domesticwastewater with BOD5 about 150mg/lit and primary drainagewaterwere accumulated at 2010. In the 6 to 9 lysimeters was planted coriander (Shahryar variety) and were irrigated by primary drainage water and then, were accumulated secondary drainage water. We have irrigation 10, 11 and 12 lysimeters by secondary drainage water that was planted inside the coriander (Varamin variety). In order to compare plants characteristics, in 13, 14 and 15 lysimeters were planted Shahryar variety, Shahr-e Rey variety and Varamin variety respectively and were irrigated by agronomical water. The results showed that the soil could reduce BOD5and COD from150 and 232 mg/lit to 11 and 18mg/lit respectively in secondary drainagewater. The essential oil yield of Shahryar variety 17% increased under irrigation by secondary drainage water into irrigation by agronomical water. Therefore, the use of secondary drainage water can be increase the quantity and quality yields in plants and the other hand, protects sweet water resources.

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