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Sorption of Micronutrients in Some Selected Paddy Soils of Bangladesh

Mostofa Amran Hossain
Additional Agriculture Officer, Department of Agricultrual Extension(DAE), Dhaka

Abu Zofar Md. Moslehuddin
Department of Soil Science, Bangladesh Agricultural University, Mymensingh

Md. Joinul Abedin Mian
Department of Soil Science, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

A laboratory experiment was carried out in the Department of Soil Science, Bangladesh Agricultural University, Mymensingh with five different soils in order to examine the sorption behavior of Fe, Mn, Zn and Cu. Multi-ion sorption solution of these elements of five different concentrations (1, 5, 10, 50, and 100 mg L^-1) were added to each soil and allowed to adsorb over five different durations (1, 5, 10, 20, and 40 days). The sorption of all micronutrients increased in all soils with increase in both concentration and time. Among the micronutrients, the sorption of Fe was the highest and that of Mn was the lowest. In general, the sorption of Fe suppressed that of Mn whereas the sorption of Cu suppressed that of Zn indicating a competition between each pair of micronutrients. Among the soils, the Dumuria soil sorbed the highest amounts of micronutrients followed by the Taherpur and Lauta soils. The amounts of micronutrients sorbed by the Tippera and Baliadangi soils were almost equal and lower than the other soils.

Keywords: Sorption, Micronutrient, Concentration, Lauta, Dumuria, Baliadangi, Tippera, Taherpur

Location: Bangladesh Agricultural University, Mymensingh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

1. To study the extent and behavior of Fe, Mn, Zn and Cu sorption, applied together, in five different levels over five different period of incubation.

Methodology:

The experiment was conducted in the Department of Soil Science, Bangladesh Agricultural University, Mymensingh, Bangladesh. Five soil series of Bangladesh were selected from different Agroecological Regions (AEZs) of Bangladesh for this study: Lauta series from Level Barind Tract, Baliadangi series from Old Himalayan Piedmont Plain, Taherpur series from High Ganges River Floodplain, Dumuria series from Ganges Tidal Floodplain and Tippera series from Old Meghna Estuarine Floodplain. The soil samples used were previously collected, air dried, gently crushed, passed through a 2-mm sieve, and preserved in plastic bottles. The soils are different from each other in respect of physiography, chemical and mineralogical properties. Approximate mineral contents in soil, which were calculated from contents and mineralogical make-up of the clay and silt fractions. Preparation of micronutrient solution for sorption study - Calculated amounts of sulphate salt of Fe, Mn, Zn, and Cu (i.e. FeSO₄.7H₂O, MnSO₄.H₂O, ZnSO₄.7H₂O, and CuSO₄.5H₂O, respectively) were dissolved in distilled water for preparation of 1000 mg L^-1 stock solution. From this stock solutions working solution of five different concentrations (i.e. 1, 5, 10, 50, and 100 mg L^-1) were prepared by diluting required amounts of stock solution with distilled water. Sorption study - Soils of each soil series were subjected to undergo sorption studies by four micro nutrients (Fe, Mn, Zn, and Cu) added together, having 5 different concentrations (1, 5, 10, 50, and 100 mg L^-1), 5 time durations (1, 5, 10, 20, and 40 days) with 3 replications. For each observation, 8 g of soil was taken in a 100 ml plastic bottle and 80 ml of sorption solution of each concentration was added. The bottle was shaken for 30 minutes in a horizontal shaker and allowed to adsorb nutrients for specific times. At the end of allocated time, the suspension was filtered through a retentive filter paper. The concentrations of Fe, Mn, Zn, and Cu in the equilibrium solution were determined with the help of an atomic absorption spectrophotometer (AAS). The difference in nutrient concentration between the initial sorption solution and equilibrium soil solution was taken as the amount adsorbed by 8 g soil. Finally the results were expressed as mg kg-1 soil.

Source of Information: BANGLADESH RESEARCH PUBLICATIONS JOURNAL; ISSN: 1998-2003, Volume: 3, Issue: 1, Page: 873-885, September-October, 2009

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The sorption of all micronutrients increased in all soils with increase in both concentration and time. Among the micronutrients, the sorption of Fe was the highest and that of Mn was the lowest. In general, the sorption of Fe suppressed that of Mn whereas the sorption of Cu suppressed that of Zn indicating a competition between each pair of micronutrients. Among the soils, the Dumuria soil sorbed the highest amounts of micronutrients followed by the Taherpur and Lauta soils. The amounts of micronutrients sorbed by the Tippera and Baliadangi soils were almost equal and lower than the other soils.

Knowledge Management: Journal