Abstract
A laboratory experiment was conducted to study the effect of artificial chelating sources of Iron made of Fulvic and Humic acid (extracted from peat moss) with Iron sulfate which added as iron humate and fulvaet (FeHA+FA), and the effect of Iron fertilizers applied as Fe-DTPA and FeSO4.7H2O on the iron kinetics. Iron sources were incubated to understand the physiochemical behavior of the various sources whether it was mineral (FeSO4.7H2O) or artificial chelate (Fe-DTPA) or natural chelate from plant residues (Fe HA+FA). The incubation periods were 1, 3, 6, 9, 12, 15, 20, 25, 30, 35, 40, 45, 50, 55 and 60 days in two replicates for each period. Iron extracted by DTPA with time from these sources was determined. The results indicated that the DTPA extractable iron were decreased with time for all sources Linear equation, which was the best to describe the relation between iron concentrations with the time compared to other formulas Artificial and natural chelating sources, were distinct by keeping on the highest level of available iron for two months compared to the mineral source of iron (FeSO4.7H2O).
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