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Carbon Accumulation and Its Mineralization in Soils Under Aerobic and Anaerobic Condition Without Crop

Munira Khatun
Scientific Officer
Soil Science Division, BRRI, Gazipur

M. Sefaur Rahman
Scientific Officer
Soil Science Division, BRRI, Gazipur

A. T. M. Sakhawat Hossian
Senior Scientific Officer
Soil Science Division, BRRI, Gazipur

Pranesh Kumar Saha
Principal Scientific Officer
Soil Science Division, BRRI, Gazipur

Abstract/ Executive Summary:

Objective of this study was to determine the CO₂ emission rate of some OM under moist and flooding situation in the laboratory condition. The bulk soil sample was collected from AEZ 1 (GPS: 250 56.855N; 0880 09.887E). A composite soil sample was analyzed for organic carbon, total N, available P and exchangeable K. In this experiment plastic jars (1100 ml air tight pot) were used. The rate of CO₂ emission was higher in earlier stage of incubation irrespective of organic sources in both flooding and moist condition. However, Poultry manure emitted more CO₂ than Cowdung Rice straw and Rice root alone.

Keywords: Carbon dioxide evolution, Organic matter, Moisture

Location: BRRI experimental farm, Gazipur

Start Date: 01-07-2012

End Date: 30-06-2013

Program Area: Crop-Soil-Water Management

Non-commodity: Carbon sequestration

Objectives:

To determine the CO₂ emission rate of some OM under moist and flooding situation in the laboratory condition.

Methodology:

The bulk soil sample was collected from AEZ 1 (GPS: 250 56.855N; 0880 09.887E). A composite soil sample was analyzed for organic carbon, total N, available P and exchangeable K. In this experiment plastic jars (1100 ml air tight pot) were used. Respective jar was filled with 100 g of bulk soils. Different organic materials such as rice straw (RS), rice root (RR), cow dung (CD) and poultry manure (PM) were analyzed and incorporated in the jar @ 5 t C/ha (0.25 g C/100 g soil or without soil) basis for each organic material. Then the soils were prepared with organic materials and two moisture regimes e.g. moist and flooding condition. The experiment was laid out in RCBD factorial with two replications. Organic materials were considered as factor A and moisture regimes were factor B. The jars were air tight and incubated at room temperature (18^oC to 34^oC) for 129 days. The CO₂ evolved by microbial respiration was measured twice a week for first two months and the rest two months once a week. The CO₂ was determined by titration of the residual NaOH with 0.5N HCl using one drop of 1% phenolphthalein indicator and 3 ml of 1N BaCl₂ solutions. The CO₂ was calculated.

Source of Information: Proceedings of BRRI Annual Internal Review for 2012- 2013

Article Link (Online Journal):

Funding Source:

1. Bangladesh Agricultural Research Council

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The CO₂ emission of different organic sources and their combination with soil considered as treatments showed that the rate of CO₂ emission was higher in early period and subsequently decreased around 49 days and then increased at 55 days irrespective of sources and their combination in both flooding and moist condition. Apparently there are no sharp differences of CO₂emission between flooding and moist condition. Among the sources PM emitted more than other sources. The emission of CO₂ was significantly influenced by sources of i.e. residues and manures under different moisture regimes. However, the interaction effect of carbon source and moisture regimes on carbon dioxide emission was found significant. Though the carbon contents in the rice straw and even in the roots were high, however, the emission of carbon dioxide was higher only in the poultry manure without soil. During 129 days of incubation the total amount of carbon dioxide released from only PM containing pot was 1.59 g/kg in flooding condition and 1.47 g/kg in moist condition which was significantly different from the treatment PM mixed with soil in both condition. The total emission of carbon dioxide over the 129 days of incubation under controlled treatment i.e. in the pot where only 100 g soil used was almost same under both conditions. On the other hand the moisture regimes did not influence on carbon dioxide emission over the time. The sources of carbon i.e. the residues significantly affected carbon balance while interaction effect of residues and moisture regimes was found insignificant. The negative sign of carbon balance revealed that carbon content in different organic material increased, where carbon output was found higher than carbon input. When plant residues and manures are applied to the soil various organic compounds undergo decomposition.

Knowledge Management: Report/Proceedings