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Diurnal Pattern of Energy Fluxes Over Rice Field

A. A. Mahmud
Department of Environmental Science, Bangladesh Agricultural University, Mymensingh

M. A. Baten
Department of Environmental Science, Bangladesh Agricultural University, Mymensingh

M. B. Khan
Department of Environmental Science, Bangladesh Agricultural University, Mymensingh

A. Miyata
National Institute of Agro-Environmental Science,Tsukuba, Japan

Abstract/ Executive Summary:

An experiment was conducted to investigate the factors responsible for the partitioning of energy balance components over BRRI dhan 28 (Boro season) rice crop at the paddy field of Bangladesh Agricultural University Farmland, Mymensingh during August 2010 to July 2011. The whole measurement period was divided into two seasons such as Boro rice and Post Boro fellow. Energy balance components were measured in this experiment using sophisticated sensors. The cropping season differences in water and energy fluxes were attributed by the availability of sunlight and abundance of water at the site as well as differences in sunshine hours during winter. Irrigation during winter Boro had substantial influence on the seasonal and interannually variability of energy partitioning at rice field. Of the papers diurnal variations in energy balance components are shown and variations in the energy balance components are discussed.

Keywords: Fluxes, Solar Energy, Energy partitioning at rice field

Location: Bangladesh Agricultural University Farmland

Start Date: 00-08-2010

End Date: 00-07-2011

Program Area: Risk Management in Agriculture

Commodity: Rice

Objectives:

I. To measure the diurnal and seasonal pattern of energy partitioning over rice fields II. To investigate the factors those affect the partitioning of solar energy over rice field

Methodology:

The study site, called MYM (three letter international code name for Asia Flux) is located in the paddy field of Bangladesh Agricultural University Farmland (24.75^oN, 90.5^oE, 18 m above sea level), 6 km to the south of Mymensingh town and 115 km to the north of Dhaka, the capital city of Bangladesh. Magnetic Declination: -00° 20' (negative west), 0.0'/year (2006/1/1); -00° 24', 0.0'/year (2010/12/31) (NOAANGDC:http://www.ngdc.noaa.gov/geomagmodels/strutsicalcDeclination). This extensive field (about 78.28 ha) is used only for rice cultivation for a period of about 40 years. A weather yard and irrigation station and located near the study site. The usual cropping patterns are irrigated Boro rice-Fallow-rain fed Aman rice. For this experiment, BRRI dhan 49 was used for Aman season and BRRI dhan 28 was used for Boro season. MYM site soils are dark-gray non-calcareous floodplain type. Study site soil possesses silty loam texture and low contents of organic matter. Topography of the soil at MYM site was low with fairly leveled surface. The experimental crops of rice were grown under recommended cultural practices at MYM site under the active supervision of Central Farm Authority at Bangladesh Agricultural University. This experiment was conducted without any influence what so ever on the rice paddy ecosystem to measure the status of energy balance. from rice paddy fields. Therefore, all state-of-the-art micrometeorological sensors were installed in a mast. These supporting data were sampled every 5 seconds using a CR23X data loggers supported by an AM25T multiplexer. Instruments used in micrometeorological measurement. Program used for collecting meteorological data. Data are sampled and recorded using CR23X (Campbell). In Mymensingh, both the summer and winter are relatively mild. The maximum and minimum temperatures as observed in April and January range between 33^oC and 12^oC. Annual mean air temperature is 25.4 degree Celsius (1995-2008). Rainfall starts in May and continues up to September. Ninety-five per cent of the annual rainfall occurs during the monsoon. Annual precipitation: 2,252mm (1995-2008). Annual rainfall recorded in 1996 was 1620 millimeters. The highest humidity observed from July to September is around 94% and minimum is about 49% from January to April. MYM site annual mean temperature and totalized rainfall data were also collected for the past 14 years from Weather Yard, BAU, Mymensingh. Mymensingh seems to be less affected by natural calamities like flood, cyclone or drought as compared to other districts of the country.

Source of Information: J. Environ. Sci. & Natural Resources, 6(1): 01 -06, 2013; ISSN 1999-7361

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The cropping season differences in water and energy fluxes were attributed by the availability of sunlight and abundance of water at the site as well as differences in sunshine hours during winter. Irrigation during winter Boro had substantial influence on the seasonal and interannually variability of energy partitioning at rice field. Of the papers diurnal variations in energy balance components are shown and variations in the energy balance components are discussed.

Knowledge Management: Journal