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Incubation Studies on Exchangable Zn for Varying Levels of Added Zn Under Aerobic and Anaerobic Conditions in Grey Terrace Soils, Non Calcarious Floodplain Soils and Calcarious Floodplain Soils

K H Talukder
Dean, Faculty of Agriculture, Biological Science, Biotechnology and Textile, Atish Dipankar University of Science and Technology, Bangladesh.

I U Ahmed
Former Professor
Department of Soil, Water and Environment ,University of Dhaka and former President ,The Peoples’ Republic of Bangladesh.

M S Islam
Former Director General
Bangladesh Agricultural Research Institute Joydebpur, Bangladesh.

M. Asaduzzaman
Executive Director
Bangladesh Science Foundation

Abstract/ Executive Summary:

Fractions studies were done to know how the zinc applied to different soils was distributed in to various fractions when the soils incubated under aerobic and anaerobic condition. The added zinc provided significant increase in exchangeable Zn both under aerobic and anaerobic conditions although anaerobic condition gave lower results than aerobic condition. The higher results were obtained at early stage of incubation and it gradually reduced as the incubation period proceeded to 90 days. These results showed all most similar trends for all the soils under study. In general, added zinc showed significantly higher results to the different fractions of soil Zn both under anaerobic and aerobic incubation with very few exceptions. The highest amount of added Zn (12 kg/ha) always produced greater results than the lower doses. Only exchangeable Zn was found higher in the 1st measurement at 15 DAI then gradually decreased but in other cases, gradual increase in zinc fractions was seen as the incubation study proceed to longer duration provided with very few exceptions. In many cases, the exchangeable-Zn found higher only at 15 DAI but sharply reduced at 30 DAI. In general, the Gray Terrace Soil produced the highest results followed by Non Calcareous Gray Floodplain and the lowest results were observed in Dark Grey Floodplain & Brown Floodplain Soil.

Keywords: Added Zn, Significant increase, Exchangeable Zn, Aerobic and Anaerobic Condition

Location: Analytical Laboratory, Division of Soil Science under Bangladesh Agricultural Research Institute, Gazipur

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To observe the exchangeable characteristics of Zn for Varying Levels of added Zn Under Aerobic and Anaerobic Conditions in Grey Terrace Soils

Methodology:

The experiment was carried out in the Analytical Laboratory, Division of Soil Science under Bangladesh Agricultural Research Institute, Gazipur to find out the easily exchangeable Zn under aerobic and anaerobic conditions in Grey Terrace Soils, Non Calcarious floodplain Soils and Calcarious Floodplain Soils. On the basis of initial chemical analyses, incubation studies were carried out in 10 soil series representing important agricultural soils of the agro-ecological zones of Bangladesh to provide wide ranges of chemical and physical characteristics of the soils. The samples were collected from the surface layer (0-15 cm). After collection they were air dried, crushed and finally screened through a 2 mm sieve. There were 4 treatments consisting of 4 levels of Zn (3, 6, 9 and 12 kg Zn/ha) from zinc sulphate imposed on 6 different soils and incubated both under aerobic and anaerobic condition up to 90 days. The experiment had three fold replication for each treatment and laid out in Completely Randomized Design. Measurement for different fraction of soil zinc were done at 4 periods as 15, 30, 6 and 90 days after incubation (DAI) both under aerobic and anaerobic condition. 30 g of air-dried 2mm sieved soil sample was weighed into a incubated bottle (125 ml). The different amount of ZnSO4 for different treatments as a source of Zn was added and mixed thoroughly by small glass rod after adding water. The incubated bottles were covered with Para film and 4 cm standing water was maintained for anaerobic condition of the soils. To maintain aerobic condition in the incubated bottle, water was added as per requirement of the filled capacity for respective soil series. The soils were incubated at about 25⁰ C, being maintained for 15, 30, 60 and 90 days both for anaerobic and aerobic condition. After completion of incubation period the soil samples were allowed to air dry followed by crushing and passing through 2 mm sieve. Samples of each incubated soils were analyzed for exchangeable zinc, organic matter bond, manganese oxide bond, amorphous iron oxide bond, crystalline iron oxide bond zinc. 10g of air dried 2 mm sieved soil and 40 ml of 1M Mg (NO₃)₂ were shaked for 2 hours .in a 50 ml centrifuge tube. The sample was centrifuged for 10 minutes, the supernatant decanted and 40 ml of deionized water was added. The sample was then shaken for 30 minutes, centrifuged as before and the two centrifugates were combined for analysis ( Shuman, 1983).

Source of Information: J. Sci. Foundation, 9(1&2): 9-14, June-December 2011 ISSN 1728-7855

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Exchangeable-Zn fraction showed almost similar results and pattern of distribution as was seen in case of aerobic condition. This result revealed that anaerobic condition did not alter the exchangeable fraction of zinc as was found in aerobic condition. However, the treatment effect was found significant and very distinct from each other irrespective to periods of measurements.

Knowledge Management: Journal