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International Journal of Pure & Applied Bioscience (IJPAB)
Year : 2017, Volume : 5, Issue : 3
First page : (582) Last page : (595)
Article doi: http://dx.doi.org/10.18782/2320-7051.2972

Impact of Long-Term Green Manuring on Adsorption-Desorption Behavior of Zinc in Calcareous Soil

Sunil Kumar*
Department of Soil Science and Agricultural Chemistry, Bihar Agricultural University,
Sabour, Bhagalpur, Bihar – 813210
*Corresponding Author E-mail: drsunilkumar20@gmail.com
Received: 12.05.2017  |  Revised: 23.05.2017   |  Accepted: 24.05.2017  


A long-term field experiment was carried out with green manuring to see the Zn- adsorption-desorption behaviors of soil. After completion of 5th cycle, adsorption process was executed by equilibrating 2.0g soil in 40ml 0.01M CaCl2 solution containing 5, 7.5, 10, 15, 25, 50, 75, 100, 150 and 200 mg ZnL-1.  The equilibrium Zn concentration varied from 0.44 to 76.16 and 0.42 to 70.52 mg L-1 at 15 and 300C, respectively due to different treatments with varying levels of Zn-concentration from 5 to 200 mg L-1. Adsorption data were fitted into Freundlich and Langmuir adsorption equations as evidenced by higher Freundlich R2 values ranging from 0.9909** to 0.9972** at 15ºC and 0.9888** to 0.9980** at 30ºC whereas, Langmuir R2 values varying from 0.9748** to 0.9955** at 150C and 0.9713** to 0.9912** at 300C. The maximum adsorption of Zn was observed in the treatment T9-10 t FYM ha-1 every year and followed by green manuring treatments.  The desorption study indicated that DTPA extracted maximum adsorbed Zn and followed by NNH4OAc and Distilled water at both15 and 300C temperature. In conclusions, Zn adsorption-desorption capacity of soils can be enhanced by manuring which can also increase the use efficiency of micronutrient fertilizers.

Key words: Adsorption, Desorption, Freundlich, Langmuir equation, Organics, Zinc.

Full Text : PDF; Journal doi : http://dx.doi.org/10.18782

Cite this article: Kumar, S., Impact of Long-Term Green Manuring on Adsorption-Desorption Behavior of Zinc in Calcareous Soil, Int. J. Pure App. Biosci. 5(3): 582-595 (2017). doi: http://dx.doi.org/10.18782/2320-7051.2972