Gendy A.A.S. ( 2012). Some Micromorphological Characteristics In The Middle Nile Delta Region Under Different Drainge SystemsEgypt. J. of Appl. Sci., 27 (4) 2012 267-278
Abstract: The Purpose of this investigation is to study the micromorphological characteristics of soils under two different systems drainage in Kuttour region EL-Gharbiya governorate. Three soil profiles were studied. One profile was nearby an open ditch surface drain ; a second profile was nearby a tile drain and third profile was located between the two profiles. Micromorphological investigation shows that the microstructure of the studied soils has a cracked to intergrain microaggregate structure in the surface layer and subangular blocky in subsurface layer. Regarding the soil voide, the three profiles have similar voids mainly simple and compound packing voids, vughs channels and chambers. The morphology of the coarse mineral materials dominated by macro, meso and micro grains dominate the morphology of the coarse mineral materials. The fine mineral are yellowish brown to brown, heterogeneous and composed of mixtures of clay minerals, calcium carbonate, organic matter and iron and manganese components. The b-fabric of the ground mass are speckled, stippled and porostraited around a plane. The type of the distribution pattern are monic or chitonie, enaulic and close and open porphyric. Types of pedofeatures in the studies soil profiles, are amoephous brown nodules of sesquioxides minerals, typic nodule of calcitic crystalline, infilling voids with fine material, cutan of iron oxides.Variation of different drainage patterns seemed to have improved the soil physical properties, which was reflected in improved microstructure, although with time some problems, would arise. The main dominant voids are horizontal planes. Iron oxides were precipitated in voids closing them. Many nodules of calcium carbonates, ferrans and calcitans were occurred in the voids . The hydraulic conductivity was relatively low which contributed in making the soil wet, causing reduction is reducing environments salinity and sodicity could occur.
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