Zinc desorption kinetics in bean (Phaseolus vulgaris L.) rhizosphere in sewage sludge-amended calcareous soils

Motaghian, H. R.; Hosseinpur, A. R.

doi:10.1007/s12665-013-2498-5

Cited by 2 publications

(1 citation statement)

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“…The rhizosphere is defined as volume of soil affected by the presence of the roots of growing plants (Uren 2007) and the soil without the presence of the roots is defined as non-rhizosphere or bulk soil (Motaghian and Hosseinpur, 2014). The conditions at the rhizosphere are considerably different from those existing some distance from root system (Nye 1981).…”

Section: Introductionmentioning

confidence: 99%

Effect of Bean (Phaseolus vulgarisL.) Rhizosphere on Zinc-Release Kinetics

Motaghian

Hosseinpur

2015

Communications in Soil Science and Plant Analysis

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The primary factor that influences release of zinc (Zn) for plant is the rhizosphere. However, information about Zn desorption characteristics in rhizosphere is limited. A greenhouse experiment was performed to determine Zn release characteristics in the bulk and the rhizosphere soils using rhizobox. The kinetics of Zn release was determined by successive extraction with DTPA-TEA in a period of 1 to 504 h at 25±1 o C in the bulk and the rhizosphere soils. Moreover, Zn extracted by using three extractants [diethylenetriaminepentaacetic acid (DTPA)-triethanolamine (TEA), ammonium bicarbonate (AB)-DTPA, and Mehlich 3] in the bulk and the rhizosphere soils. The results showed that Zn extracted in the rhizosphere soils were significantly (P<0.01) lower than the bulk soils. The mean of Zn release in the bulk and the rhizosphere soils were 5.31 and 4.91 mg kg -1 , respectively. Release kinetics of Zn conformed fairly well to power function, first order, parabolic diffusion, and simplified Elovich equations. The results of kinetics study indicated that release rate coefficients decreased in the rhizosphere soils compare to the bulk soils. The correlation studies showed that Zn release after 504 h was significantly correlated (P<0.05) with Zn extracted by using DTPA-TEA, AB-DTPA and Mehlich 3 in the bulk and the rhizosphere soils. The results of this research showed that Zn release characteristics in the bean rhizosphere soils were different from the bulk soils.

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Section: Introductionmentioning

confidence: 99%