Soil content of low molecular weight organic acids and biological properties for Date palm(Phoenix dactylifera) and Zizyphus (Ziziphus spinachriti) root zone (Rhizosphere) of some calcareous soil

Abstract

Two sites(Abul– Khasseb and AL – Chabacy) in Basrah gavernorate were selected to study the effect of Date palm (Phoeninx dactylifera ) and Zizyphus (Zizyphus spinachriti) root Zone (Rhizosphere) ,and samples from bulk soil (as control) at three depths (0 – 30 ) , (30 – 60 ) and( 60 – 90 ) cm on different soils properties . Rhizosphere soils of Abul – Khasseb and AL – Chabacy were surpassed with high content of low molecular weight of organic acids (LMWOAs) as compared with bulk soils .Soils content of organic acids were as follow: Malic acid < Citric acid < Succinic acid < Maleic acid < Oxalic acid. Numbers of bacterial and fungi colonies were increased in rhizosphere zones of studied situations plants and depths as compared with bulk soil , to confirm the activity of this zone and its biological role in many changes and reactions