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EFFECT IRON APPLICATION ON CHEMICAL EQUILIBRIUM STATE OF IRON COMPOUNDS IN SOIL | ||
| AL-TAQANI | ||
| Article 1, Volume 22, Issue 1, 2009, Pages 0-0 | ||
| Abstract | ||
| Incubation experiment was conducted to study the effect Iron application on chemical equilibrium state of Iron compounds of some Iraqi soils and compounds showing which control of availability to uptake by plant. Two kind soils were used, heavy soil from Abu-Graib and light soil from Al-Mussiab treated with six levels of Iron (0.5, 1, 2, 4, 8, and 16) mmol.Fe.Kg-1.soil as ferrous sulfate (FeSO4.7H2O). All treats soil materials were incubated in an incubator at 25ºC for (4) incubation periods (day, three days, week, month). After each period samples were analyzed for, ECe, pH, and soluble Iron concentration in solution after equilibrium .Calculation of some thermodynamics indictears of Iron Ionic strength of solution, activity coefficient activity of Iron in equilibrium solution and iron potential in soil. Solubility diagram were calculated of Iron compounds in soil. Results of this experiment showed same behavior of iron in light and heavy soils but that the heavy soil resulted high concentration of soluble iron from that light soil and decrease of iron potential from that light soil during all incubation periods and all level application. Results also showed that low levels of Iron applied can not saturation to soil solution with soluble iron hydroxide during all incubation periods; The Lepidocrocite (µ-FeOOH) compound was controlled on iron availability in low time periods of incubation. Hematite (χ-Fe2O3) compound was controlled on Iron availability in long time's periods of incubation. High applied levels of Iron can soil solution saturation of Iron oxides and hydroxide compounds during low times periods, maghemite(µ-FeO3) compound controlled on Iron availability at low times periods of incubation , Lepidocrocite compound was controlled at long times periods of incubation | ||
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