Supplement USDA (2014) the 7 th. Approximation and its modification into the two orders; Entisols and Aridisols, of which soils related to the order Aridisols, are the more concerned herein.

RECENTLY, vanadium levels have been increased in soil crust particularly in industrial areas. Vanadium content in food directly depends upon total initial content in soil. The distribution and mobility of vanadium in some calcareous soils along northwestern coastal region of Egypt were studied. The relationship between soil physical and chemical properties and vanadium fractions was studied. The results indicate that the less dominant chemical speciation of vanadium in calcareous soils was soluble and exchangeable vanadium followed by vanadium bound to carbonate < vanadium bound to organic matter < vanadium bound to FeMn oxyhydroxides < vanadium bound to soil matrix (residual). The major species of vanadium was the residual form that accounted for 81.6 % to 90.1% of total vanadium. The mobility index of vanadium was found to be in the following sequence according to the studied cities Burg El Arab > Al Alameen > Marsa Matrouh > El Hammam > Ras Alhekma > Al Dabaa > Sidi Abdl Rahman. The mobility index ranged among 0.8 % and 4.2 %. The high concentrations of vanadium in the studied plants were found in those around industrial areas of Burg El Arab City.

IVE soil profiles were selected to represent the two major soil …….taxonomic subgroups (LCCM and LECN) NW Wadi ElNatrun. The sand subfraction (0.125-0.063mm) of those soils were reseparated into light and heavy minerals (opaques and nonopaques).The obtained results reveal that light minerals are mainly composed of quartz followed by low amounts of feldspars. Plagioclase and /or microcline predominates in both soils. Moreover, orthoclase is commonly the least abundant in the LCCM.Regarding heavy minerals, opaques are the predominant content is. In both soil subgroups, opaques are dominated by oxides followed by sulphides while hydroxides are the least. In the non-opaques, amphiboles exceed pyroxenes, Parametamorphic, ubibutous, epidotes minerals in a descending order in the LCCM while the converse is true in the LECN.The frequency and depthwise distributions of each identified mineral are presented for each profile and soil subgroups are interpreted in a trial to distinguish between those soil subgroups.Based on the ratios between heavy minerals and weathering ratios, the soil origin, genesis and formation are predicted and graphical triangular presentation for opaque and non-opaque minerals suggested the possible use of pyroboles, epidote, and parametamorphic relation for soils differentia.

Data of biological investigation showed that the total counts of bacteria, fungi, yeast, actinomycetes, thermophilic bacteria and cellulolytic bacteria range from 22.4x10 6 to 284x10 6 , 10x10 3 to 27.x10 3 , 6x10 2 to 20x10 2 , 9x10 3 to 19x10 3 , 31x10 3 to 48x10 3 , 0.90x10 4 to 1.82x10 4 CFUg -1 dry soil respectively. The nitrifying and denitrifying bacteria range from 38.0x10 4 to 121.0x10 4 and 30.0x10 2 to 65.0x102 MPN g -1 dry soil, respectively. The biological activities of the concerned enzymes were also recorded and interpreted.Statistical evaluation reveals that soil OM, pH, EC e, Ca ++ , Na + , Cl -, SO 4 -and exchangeable Na are correlated well with total counts of most bacteria, fungi and actinomycetes. Also, OM is correlated with dehydrogenase, alkaline phosphatase and urease.

T HE CURRENT study aimsatcomprehending the distribution of the different forms of cobalt and its relationship to the mineralogical composition of soils of the 10 th of Ramadan City, Egypt.Eight representative soil profiles were selected from the study area. Results showed that soil texture ranged from sand to sandy loam. Soil pH ranged from 6.98 to 8.68. EC values ranged from 8 to 8. 12 dSm-1 at 25°C whereas the predominant cations followed the descending order: Ca 2+ >Mg 2+ >Na + >K + , while the anions followed the sequence:SO 4 2->Cl->HCO 3-. The predominant clay minerals were kaolinite, montmorillonite and illite, accompanied with accessory minerals in the descending order; quartz>gypsum >dolomite >calcite>aragonite>hematite >muscovite>potassium feldspar. The total cobalt (Co)content ranged from 1.42 to 6.51 mgkg-1 and the DTPA-extractable Co content ranged from 0.65 to 1.75 mgkg-1. The successive extraction (fractionation of Co) exhibited that the residual form was the most dominant one where its percentage ranged from 34.01 to 82.90%. The soluble, exchangeable, carbonate bound, Fe-Mn bound andorganic boundforms ranged from: 1.38 to 4.23, 5.26 to 45.58, 1.79 to 7.34, 2.63 to 7.75, and 2.29 to 9.52%, respectively.Thus, it can be said that the following sequence characterized the distribution of Co forms among the different fractions:Residual >>exchangeable >organic-bound >Fe-Mn-bound > carbonate-bound >soluble. Accordingly,theobtained results evidently showed that there were relation between cobalt forms and mineralogical composition of soils.