Total and dtpa-extractable micronutrients as correlated to some soil properties in kaluobia governorate [electronic resource].

Includes references.

This work aims at studying and evaluating the relation between total and DTPA-extractable Fe, Mo, Zn, eu and Mo and some soil variables, i.e. soil texture, caeo3 content, O.M and CEC of seventeen soil profiles representing the main soil types of Kaluobia Governorate. Obtained results could be summarized as follows: • Total iron content ranged from 135 to 66000 mg kg-I whereas DTPA extractable Fe ranged between 4.4 and 18.5 mg kg- 1 in the studied soils. • Totlal manganese content ranged from 87 to 985 mg kg-I whilt DTPA extractable Mn ranged from 0.4 to 9.5 mg kg- 1 • Total zinc content ranged from 25 to 175 mg kg- 1 and the DTPA extractable Zn varied between 0.3 to 4.2 mg kg- l deperding on soil texture. • Total copper content in the studied soils ranged between 17.7 and 97.5 mg kg-I, whereas DTPA extractable Cu varied from 1.1 to 09.9 mg kg-1 with an increase in the surface layers. • Total Mo content in the studied soil profiles varied widely from 2.9 to 21Amg kg-I, DTPA extractable Mo ranged 0.07 to 1.26 mg kg-].The vertical distribution of DTPA extractable Mo indicarcs a relativeincrease of Mo in the top surface layers. • Highly significant positive correlation was found between total soil content of most of the studied elements and each of caeo3, 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 ell is high and that of Zn isadequateandmarginal.• The trend T indicates that some of the soil profiles are highly symmetric with respect to Fe, Mn, Zn and eu 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.

Summary in Arabic.

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