Kinetics of Zinc release in Corn Rhizosphere during cultivation period in a calcareous soil

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Bahrini M.; Fotavat A.; Karimi Karouye A.R.; KHORASANI R.; HOSSEINPOUR A.R.

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Journal: Journal of Water and Soil Conservation Year:2019 | Volume:26 | Issue:4 Page(s): 223-238

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Title

Kinetics of Zinc release in Corn Rhizosphere during cultivation period in a calcareous soil

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Keywords

DTPA-TEAQ1

Release KineticsQ1

RhizoboxQ2

RhizosphereQ1

ZincQ1

Abstract

Background and Objectives: Zinc-released (Zn) in the Rhizosphere soil is the primary factor that affects bioavailability of Zn. To investigate the effect of root activity on Zn release in a polluted soil at different harvesting times, a greenhouse experiment was conducted using Rhizobox. Materials and Methods: Soil sample was collected from the 0– 30 cm depth of a calcareous soil from agricultural fields located in the Zanjan province, Iran. In order to study the effect of maize root exudates on the Zn release using a Rhizobox. The Rhizobox was divided into three sections, including a central zone for plant growth (20 mm), near Rhizosphere zones (20 mm), and non-Rhizosphere zones (40 mm). Eight seeds were sown per Rhizosphere zone and subsequently thinned to two plants. Plants were harvested 30, 60 and 90 days after germination. This research was conducted in a factorial design, with 3 replications, three levels of time (30, 60 and 90 day) and three zones classified based on their distance from root. The kinetics of Zn release in non-Rhizosphere and Rhizosphere soil was determined by successive extraction with DTPA-TEA in a period of 1 to 528 h at 25± 1 C. Results: The results showed that The results showed that with increasing time, the cumulative released of Zn increased. Also, the amount of cumulative released of Zn in the Rhizosphere soils were significantly (P<0. 05) lower than near Rhizosphere and non-Rhizosphere soils at 60 days after planted, due to plant uptake. There were also significant differences between harvesting times. The mean of Zn released in the bulk, near root and the Rhizosphere soils were 278. 5, 269. 18 and 259. 7 mg kg-1, respectively at 60 days after planted. Comparisons of R2 and SE values indicated that the power function and first-order kinetic equations described the reaction rates fairy well, as evidenced by the high coefficients of determination and low standard error of the estimate. In addition, the parameter b in power function was <1 in all samples, indicating that the Zn released rates were decreasing with time. The best model for describing extraction data for bulk and Rhizosphere soils was the power function kinetic equation. Conclusion: The results of this research revealed that Zn release characteristics that are helpful to estimate the Zn supplying power of soils in the maize Rhizosphere, which is different from the bulk soil. Also, the amount of Zinc released has been influenced by the different times of the crop period, which indicates that during the plant growth period, the release rate of the elements varies over time.

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APA: Copy

Bahrini, M., Fotavat, A., Karimi Karouye, A.R., KHORASANI, R., & HOSSEINPOUR, A.R.. (2019). Kinetics of Zinc release in Corn Rhizosphere during cultivation period in a calcareous soil. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 26(4 ), 223-238. SID. https://sid.ir/paper/156105/en

Vancouver: Copy

Bahrini M., Fotavat A., Karimi Karouye A.R., KHORASANI R., HOSSEINPOUR A.R.. Kinetics of Zinc release in Corn Rhizosphere during cultivation period in a calcareous soil. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2019;26(4 ):223-238. Available from: https://sid.ir/paper/156105/en

IEEE: Copy

M. Bahrini, A. Fotavat, A.R. Karimi Karouye, R. KHORASANI, and A.R. HOSSEINPOUR, “Kinetics of Zinc release in Corn Rhizosphere during cultivation period in a calcareous soil,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 26, no. 4 , pp. 223–238, 2019, [Online]. Available: https://sid.ir/paper/156105/en

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