ANBAR JOURNAL OF AGRICULTURAL SCIENCES

Abstract

An experiment was conducted in the laboratory to study the effect of artificial chelating source of iron fertilizer made from the interaction between humic+fulvic acid (extracted from peatmoss) with Iron sulfate which added as humate and fulvate (Fe-HA+FA);and Iron fertilizers added in form of Fe DTPA and FeSO4.7H2O on the adsorption of thermally symmetrical Iron. The various iron sources (the mineral, artificial chelating and natural chelating) were applied in 7 concentrations (10, 40, 80, 120, 200, 300 and 400 μg Fe ml-1) in two replicate each 20 mL of each concentration was applied to 1 g soil. Adsorbed amount of iron was estimated and iron adsorption was demonstrated using Langmuir adsorption model. Results shp[w7.[ed that applying (Fe-HA+FA) decreased iron adsorption as the applied concentration increased in comparison to (FeSO4.7H2O) and (Fe-DTPA). The lowest iron maximum adsorption capacity reached 6200 mg kg-1 by applying Fe-HA+FA, while adding (FeSO4.7H2O)increased the capacity to 7734.92 mg Kg-1. The Fe-DTPA was in the middle by showing maximum adsorption capacity of 6800 mg Kg-1. Also highest bonding energy (K) and highest adsorption maximum for the applied Iron was from FeSO4.7H2O while Fe-DTPA was in the middle in term of adsorption maximum and bonding energy between both mineral source and the natural chelating source of Iron