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Effect of Submergence on Zinc, Iron, Manganese and Copper Availability in Bangladesh Soils

M. Jahiruddin
Department of Soil Science Bangladesh Agricultural University, Mymensingh.

M.S. Crasser
Soil Science, University of Abedaen, Aberdeen Ab9 2UE, U.K.

Abstract/ Executive Summary:

An incubation experiment was initiated to investigate into the availability of Zn, Fe. Mn and Cu in soil under submerged condition and Zn fertilization. Noncalcareous Dark Grey Floodplain (Sonatala series) and Calcareous Dark Grey Floodplain Soils (Ghior series) of Bangladesh were used in this study. The net effect of 60 days soil submergence was to decrease the availability of Zn in soil. Soil submergence caused an increase of Fe. Mn and Cu availability for the non-calcareous soil while in the calcareous soil the availability of Fe and Cu increased and the Mn level declined. The fertilizer Zn- ED TA compared to ZnO and ZnSO₄. appeared to be the most promising with respect to maintaining Zn in solution.

Keywords: Submergence, Zn, Fe, Mn, Cu

Location:

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To study the availability of Zn and other micronutrients, Fe. Mn and Cu. under anaerobic incubation and Zn fertilization.

Methodology:

Two soils, narnely Non-caleareous- DarK Grey Floodplain (Sonatola series) and Calcareous Dark Grey floodplain (Ghior series) wore used in this study. The range of incubation periods used was 0 to 2 months. Zinc was added to the soil in soutlon or in suspension form from three different sources. ZnO. ZnS0₄, and Zn-EDTA. For the ZnO treatment, the fertilizer was suspended in water. Its Zn concontration was determined before use after dissolulion in O.2M HCl by atomic absorption spectre photometry. Zn-EDTA solution was prepared by mixing solutions containing equimolar quantities of ZnS0₄, 7H₂0 and Na₂EDTA. For all Zn sources Analar grade was chosen. Duplicate 5-g samples of each sell were weighed into a series of 50-ml centrifuge tubes. An appropriate amount of Zn solution/ suspension and deionized water (TotaI 25 ml) were added to bring the water height above soil surface to 4 cm. The tubes were shaken for 10 minutes with parafilm covers on the top and kept for O. 1. 4, 7. 15, 30 and 60 days at a temperature of 25⁰C ±: 0 5°C. At the expiry of set incubation time. the tubes were further shaken for 10 minutes, and the solutions were centrifuged and filtered. Finally, the soil residues in the tube were shaken with 10 ml of DTPA solution at pH 7.3 (Lindsay and Norvell. 1978) for 2 hours. The extracts were collected after being centrifuged and filtered through Whatman No. 42 filter papers. The Zn, Fe. Mn and co concentrations in the water and DTPA extracts were determined directly by atomic absorption spectrophotometry. using matrix matched standards. The pH values of the water extracts were measured. The entrained solution carried over to the DTPA extract was taken into account in calculating the results of DTPA-extrac- table species.

Source of Information: Bangladesh J. Agril. Sci. 17 (1): 85-91: January, 1990

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Soil submergence caused an increase of Fe. Mn and Cu availability for the non-calcareous soil while in the calcareous soil the availability of Fe and Cu increased and the Mn level declined. The fertilizer Zn- ED TA compared to ZnO and ZnSO₄, appeared to be the most promising with respect to maintaining Zn in solution.

Knowledge Management: Journal