Effect of olive mill wastewater spreading on the rhizosphere potassium and the growth of an intercropping system triticale-forage pea

S. Mouas Bourbia, S. Sid Ali, H. Kefsi, D. Issaoun, G. Yahiaoui Tibiche, D. Louni, O. Omouri


Abstract: In order of olive mill wastewater (OMW) valorization, a greenhouse study was conducted to investigate the OMW effects on potassium content in the rhizosphere and on the growth of an intercropping system triticale-forage pea. The used soil is a calcaric cambisol with a silt-clay texture. Despite high EC (10.8 dS.m-1) of OMW, bulk and rhizospheric soil of two species in monocropping and intercropping systems did not show a salinization after 45 days of cropping. The bulk soil and rhizosphere of monocropping and intercropping systems has been enriched in KNH4+ after OMW spreading. However, intercropping induced a higher KNH4+depletion in the rhizosphere compared to monocropping systems. No negative effects of OMW application were observed on the seeds emergence and the growth of two species. In general, the root system of cereal has more benefit from intercropping and OMW application. The valorization of OMW by spreading on soil of mixed forage crop would be a sustainable agro-ecological solution to the environmental nuisances caused by the uncontrolled release of OMW.

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