Prof. Hassan Hamza Abbas Ramdan :: Publications:

• This work aims at studying and evaluating the relation between status of total and DTP A extractable Fe, Mn, Zn, Cu and Mo and some soil variables i.e soil texture, CaCO2 content, O,M and CEC, of the different soil types of Kaluobia governorate. • To fulfill these purposes, seventeen soil profiles representing the main soil types of El - Kaluobia Governorate were examined and status of some nutritive heavy elements were evaluated. The obtained results of the studied nutrients in the tested soil samples could be summarized as follows:- • Total iron content ranged from 10200 to 66000 mg kg-1 whereas DTP A extractable Fe ranged between 4.4 and 18.5 mg kg"1. • Total manganese content ranged from 0.5 to 985 mg kg-1, this wide range of total Mn attributed to the difference in the type and nature of soil materials. DTPA extractable Mn ranged frome 0.4 to 9.5 ppm. • Total zinc content ranged from 0.32 to 159.0 mg kg"1 and the DTPA extractable Zn varied between 0.3 to 4.2 mg kg"1 depending on soil texture. Total copper content ranged between 17.7 and 97.5 mg kg"1, whereas DTPA extractable Cu varied from 1.1 to 9.9 mg kg-1 with an increase in the surface layers. • Total Mo content varied widely, ranging from 2.9 to 21.4 mg kg-1,and DTPA extractable Mo ranged from 0.02 to 1.24 mg kg"1. The vertical distribution of DTPA extractable Mo indicate a relative increase of Mo in the top surface layers. • Highly significant positive correlations were found between total soil content of the most studied elements and each of CaC03, silt %, clay %, and CEC, whereas highly significant negative correlation was found with sand %. • In the most studied soil profiles, soil contents of available Fe and Mn are considered to be adequate whereas that of available Cu is high and that of Zn is adequate and marginally. • The trend T indicates that some of the soil profiles are highly symmetric with respect to Fe, Mn, Zn, Cu than with Mo, whereas the specific range (R), shows the homogenity of some soil profiles with respect to some elements and heterogenity with respect to others.