Effect of applied iron on iron desorption in soil and uptake by wheat plants

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Abstract: Kinetic, fractionation and uptake studies was conducted in pot experiment to evaluate iron release and its bioavailability and
uptake by wheat crop grown in calcareous soils. Iron applied in the form of Fe-EDDHA at rates of 0, 10, and 20 ppm Fe, in soils
varying in contents of CaCO3 (2.13, 14.66 and 25.34 %) at 20, 40 and 80 days. Results from the kinetic study proved that, the
Elovich, power function, hyperbola and parabolic diffusion kinetic models gave high conformity to describe the desorption rate
of iron from the studied soils. However, according to higher R2 and lower SE values, both the Elovich and hyperbola models were
the most appropriate models as compared to other kinetic models tested. Fractionation study indicated that, a gradual increase in
different iron fractions was observed due to Fe application up to 40 days of incubation period. The effect of varying levels of Fe-
EDDHA was signifi cant; with respect to water soluble, exchangeable and Pb-displaceable iron content in soil. However, increasing
CaCO3 content in soils signifi cantly decreased all iron fractions in the soils used. The effects of applied Fe resulted in signifi cant
differences regarding dry weight, available Fe, Ferrous iron and Fe uptake by wheat plants in pot experiment. Application of 20
ppm Fe recorded the highest as compared to other treatments. Regression equation proved that, wheat dry weight is mostly affected
by both DTPA-Fe, Fe uptake by plant; water soluble Fe and exchangeable Fe in soil

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Publication year

2008

Pages

77-84

Organization Name

Soil, Water and Environment Research Institute (SWERI)

serial title

Journal of Applied Biological Sciences

Web Page

www.nobelonline.net