Land spreading of olive mill wastewater: effects on soil chemical properties and microbial activity
This study was carried out to evaluate the effect of olive mill wastewater (OMW) land-spreading on soil chemical properties and microbial activity. The experiment was conducted over four consecutive years (2012-2015) on olive cultivar 'Nabali Muhassan' grown in a private orchard located in Ramtha district, Irbid governorate. OMW was applied each year to an orchard of 16-year-old trees in December at five application rates: a control (no application of OMW) and 5, 10, 15 and 20 L m-2. Results of OMW analysis showed normal properties of OMW used in Jordan. Results of the soil analysis showed significant differences between the application treatments and the control for most of the measured parameters. Application of OMW at 15 and 20 L m-2 significantly raised soil electrical conductivity (EC), Na, SO4, P, K, Fe, Cu, Mn, Zn, total phenols, organic matter and dissolved organic carbon compared with the control. Soil microbiological tests indicated promotion of microbial activity in response to OMW application compared with the control.
Ayoub, S., Bashabsheh, I., Abulaila, K., Damer, S., Khreisat, Z., Obeidat, I., Al-Jazazzi, S., Naser, Z., Quddoumi, S. and Abudalo, A. (2018). Land spreading of olive mill wastewater: effects on soil chemical properties and microbial activity. Acta Hortic. 1199, 291-298
olive mill wastewater, phenols, soil chemical properties, total bacteria count, total fungi count