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Soil samples were collected from on-going long-term experiment at Bahtim area, Kalubia Governorate, Egypt, to study the distribution of various forms of iron, manganese, zinc and copper. The optimum dose-based treatments selected for the study were N(15kg/ fed), N(15kg/fed)-P, N(15kg/ fed)-P-K,N(30kg/fed),N(30kg/fed)P,N(30kg/fed)-P-K,N(60kg/fed), N(60kg/fed)-P, N(60kg/ fed)-P-K, organic (FYM), and control (no fertilizer or manure). Differnet fractions of Fe, Mn, Zn and Cu in the soil were sequentially extracted using different extractants. DTPAextractable Fe, Mn, Zn and Cu in soil increased in all treatments compared to control as a result of continuous cropping and fertilizer application. The amount of Fe, Mn, Zn and Cu in different fractions revealed the following order: exchangeable ˂ organically bound ˂ manganese oxides ˂ crystalline iron oxides ˂ amorphous iron oxides˂ residual. DTPA-Fe showed significant correlations with all Fe fractions except manganese oxides-Fe. DTPAMn showed significant correlations with all Mn fractions except crystalline iron oxidesMn. DTPAZn showed significant correlation with all fractions of Zn except both exchangeable and organic matterZn. As for, DTPACu results showed a significant correlation only with organic matterCu.

CHANGES IN FRACTIONS OF SOME MICRONUTRIENTS AS AFFECTED BY CONTINUOUS CROPPING AND LONG-TERM APPLICATION OF MINERAL AND ORGANIC FERTILIZER.