Does olive mill wastewater stimulate olive plants growth?
2019
Dbara, Soumaya | Ouni, Azhar | Brahim, Mariem | Fezai, Néjia
Olive mill wastewater (OMW) is annually produced in enormous quantities and it constitutes a serious environmental problem. For several years OMW was used as an amendment in olive orchards which given beneficial effects on growth and soil properties. The present work aimed to study the effect of OMW used after one year from the oil extraction, where phenol content decreased. One-year-old plants of “Chemlali” olive cultivar were subjected to three treatments. C0, C1, and C2 were respectively 0%, 30%, and 45% of OMW used for amendment. Each rate was adjusted with water supplied every 15 days (1 L/plantlet). Results showed significant differences between treatments especially for growth, chlorophyll content of leaves (SPAD), and leaf nutrient content (P, K, Ca, and Na). Always C2 was better than C1. Substrate properties were clearly ameliorated particularly an increase of organic matter but the pH and the electric conductivity were unaffected.
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