The allelopathic potential of aqueous extract of air-dried olive processing waste (OPW) at four concentrations (1.0, 3.0, 6.0, and 9.0% w/v) on grain germination and seedling growth of Zea mays was studied under laboratory conditions. The germination of corn grains showed a relative tolerance to OPW aqueous extract. Increasing the concentration of OPW extract up to 3.0 % significantly improved the biomass of radicle and plumule thereafter; the fresh and dry weights were significantly reduced. A parallel result obtained for accumulation of soluble sugars and proteins. Thus, the effect of OPW aqueous extract may be promotive or inhibitory depending on the used concentration.
Key words: Allelochemicals, Biomass, Germination, Olive processing waste, Proteins, Sugars, Zea mays.
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