אסיף מאגר המחקר החקלאי

Replacing saline-sodic irrigation water with treated wastewater: Effects on saturated hydraulic conductivity, slaking, and swelling

Year:

2008

Source of publication :

Authors :

Volume :

26

Co-Authors:

Bhardwaj, A.K., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO), Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Mandal, U.K., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO), Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Bar-Tal, A., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO), Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Gilboa, A., Eden Farm, Extension Service, Bet She'an Valley, Israel
Levy, G.J., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO), Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel

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Abstract:

Irrigation with saline-sodic water imposes sodic conditions on the soil and reduces the soil's productivity. We hypothesized that replacing saline-sodic irrigation water with lesser saline-sodic treated waste water (TWW), albeit with higher loads of organic matter and suspended solids, might help sodic soils regain their structure and hydraulic conductivity. We studied hydraulic conductivity (HC), aggregate stability and clay swelling of a soil from the Bet She'an Valley, Israel using samples taken from a non-cultivated field (control), and plots irrigated with TWW, saline-sodic Jordan River (JR) water, and moderately saline-sodic spring (SP) water. Soil samples were taken at the end of the irrigation season (autumn 2005) and at the end of the subsequent rainy season (spring 2006). In the HC and the aggregate stability determinations, for both sampling seasons, the TWW-irrigated samples gave significantly higher values than the SP- and JR-irrigated samples, but lower than the samples from the control plot. The autumn samples exhibited, generally, higher HC and lower swelling levels compared with the spring samples. Conversely, aggregate stability of the spring samples was higher than that of the autumn samples. These seasonal changes in the results of the three tests were associated with seasonal changes in the salinity and sodicity of the soils. © 2007 Springer-Verlag.

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