F. A. HELLAL, A. K. AMER, A. M. ZAGHLOUL

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

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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[1] Sparks DL. 1989. Kinetics of soil chemical processes. Academic press, San Diego, CA.
[2] Marschner H, Roemheld V, Kissel M. 1986. Different strategies in higher plants in mobilization and uptake of iron. Journal of Plant Nutrition. 9: 695–713.
[3] Von Wirén N, Marschner H, Römheld V. 1995. Uptake kinetics of iron-phytosiderophores in two maize genotypes differing in iron effi ciency. In: Physiol. Plant., Band 93, Heft , S. 611 – 616
[4] Goodman BA, De Kock PC. 1982. Mo¨ssbauer studies of plant materials. I. Duckweed, stocks, soybean and pea. J. Plant Nutr. 5: 345–353.
[5] Lindsay WL. 1984. Chemical Equilibria in Soils. J. Wiley & Sons, New York.
[6] Hellal FA 2005. Iron management practices for groundnut- Maize cropping sequence in calcareous Vertisol. Ph.D Agri. Thesis. (Soil Sciences and Agricultural Chemistry), University of Agricultural Sciences, Dharwad, INDIA.
[7] Chen Y, Barak P. 1982. Iron nutrition in calcareous soils. Adv. Agron 35: 217–240.
[8] Schaller k. 1983. Die chlorose der Weinreben-Entstehung und Moglidkeiten der Bekampfung. Dt. Weinbau-Jahrbuch. 34: 119-363.
[9] Moraghan JT, Mascagni HJ. 1991. Environmental and soil factors affecting micronutrient defi ciencies and toxicities. 371-425 p. In: Mortvedt et al. (eds.) Micronutrients in Agriculture, second edition. Soil Science Society of America, Madison, Wisconsin.
[10] Norvell WA. 1991. Reactions of metal chelates in soils and nutrient solutions, in Mortvedt, Cox J, Shuman FR., Welch LM.: Micronutrients in Agriculture. Soil Science Society of America, Inc., Madison, Wisconsin, USA, pp.187–227.
[11] Ziaeian AH, Malakouti MJ. 2001. Effects of Fe, Mn, Zn and Cu fertilization on the yield and grain quality of wheat in the calcareous soils of Iran, Horst WJ et al., Plant nutrition – Food security and sustainability of agroecosystems.P. 840-841.
[12] Rowell DL. 1994. Soil science: methods and applications. Longman Group, Harlow.
[13] Zaghloul AM. 2002. Kinetics of potassium adsorption in some soils of Egypt using Electrical Stirred Flow unit (ESFU). Egyptian J of Soil Sci., 42: 463 – 471.
[14] Aharoni C., Sparks DL. 1991. Kinetics of soil chemical reactions. A theoretical treatment, in rates of chemical reactions. Soil Sci. Soc. Am. Special Publ., Soil Sci. Am., Sparks DL and Suarez DL, Eds. pp. 1- 18, Madison, WI.
[15] Low MJ. 1960. Kinetics of chemisorption of gases on solids. Chem. Rev. 60: 267 - 312.
[16] Chien SH, Clayton WR. 1979. Application of Elovich equation to the kinetics of phosphate release and sorption in soils. Soil Sci . Soc. Am. J. 44: 265 - 268.
[17] SAS Institute 1995. SAS user’s guide, Statistics, Version 5 ed. SAS Ins., Cary, NC.
[18] Miller WP, Martens DC, Zelazny LW. 1986. Effect of sequence in extraction of trace metals from soils. Soil Science Society of American Journal, 50: 598-601.
[19] Katyal JC, Sharma BD. 1980. New technique to resolve iron chlorosis. Plant and Soil. 55(1): 105-109.
[20] Olsen RV, Roscoe Ells JR. 1982. Methods of soil analysis, part 2. Chemical and Microbiological properties, No. 9, 2nd Edition.
[21] Zaghloul AM, Abou Seeda MT. 2005. Evaluation of chemical remediation techniques of Pb-contaminated soils using kinetic approach J. Applied Sci. J. Agric. Sci. Mansoura Univ., 30(7): 4303-4319.
[22] Clevenger TE, Mullins W. 1982. The toxic extraction procedure for hazardous waste. In Trace substances in environmental health XVI. Univ. of Missouri, Columbia, MO. pp. 77-82.
[23] Rashid R, Rafi que E, Din J, Malik SN, Arain MY. 1997. Micronutrient defi ciencies in rainfed calcareous soils of Pakistan. Communication in Soil Science and Plant Analysis, 28 (1): 135-148.
[24] Elkhatib EA, Hern JL. 1993. Kinetics of phosphorus desorption from application soils. Soil Sci., 145: 222 -229.
[25] Sikora FJ, Copeland JP, Mullins GL, Bartos JM. 1991. Soil Sci. Soc. Am. J. 55 362
[26] Yerriswamy RM, Vasuki N, Satyanarayana T. 1994. Alleviation of iron chlorosis of maize on calcareous Vertisol. Journal of the Indian Society of Soil Sciences, 42 (1): 156-159.
[27] Marschner H, Romheld V. 1995. Strategies of plants for acquisition of iron, Plant and Soil, 165: 261-274.
[28] Sarkar R. 2000. Solution chemistry and availability of iron to groundnut crop (Arachis hypogaea L.) in calcareous soils. M. Sc.(Agri.) Thesis, University of Agricultural Sciences, Dharwad.