This work aimed studying and evaluating the relation between total and DTPA-extractable Fe, Mn, Zn, Cu and Mo and some soils variable i.e. soil texture, CaCO3 content, OM and CEC of seventeen soil profiles representing the main soil types of Kalubia Governorate. Obtained results could be summarized as follows:Total iron content ranged from 135 to 66000 mgkg-1 whereas DTPA extractable Fe ranged between 4.4 and 18.5 mgkg-1 in the studied soils.
Total manganese content ranged from 87 to 985 mgkg-1 whereas DTPA extractable Fe ranged between 0.4 and 9.5 mgkg-1 in the studied soils. Total zinc content ranged from 25 to 125 mgkg-1 whereas DTPA extractable Fe ranged between 0.3 and 4.2 mgkg-1 depending on soil texture.
Total cupper content in the studied soils ranged from 17.7 to 97.5 mgkg-1 whereas DTPA extractable Cu ranged between 1.1 and 9.9 mgkg-1 with an increase in the surface layers.
Total Mo content in the studied soil profiles varied widely between 2.9 to 921 mgkg-1 whereas DTPA extractable Mo ranged between 0.07 and 1.26 mgkg-1. The vertical distribution of DTPA extractable Mo indicate a relative increase of Mo in the top surface layer. Highly significant positive correlation was found between soil content of most of the studied elements and each of CaCO3, silt %, clay % and CEC, whereas highly significant negative correlation was found with sand %. In most soil profiles, soil content of available Fe or Mn is considered to be adequate whereas that of available Cu is high and that of Zn is adequate and marginal. The trend T indicates that some of the soil profiles are highly symmetric with respect to Fe, Mn, Zn and Cu than with Mo, whereas the specific range (R) shows the homogeneity of some soil profiles with respect to some elements and heterogeneity with respect to others. |
