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Validation of Dras Model for Irrigation of Wheat

P. K. SARKAR
IWM Division, Bangladesh Agricultural Research Institute (BARI),

M. S. ISLAM
FMPE Division, Bangladesh Agricultural Research Institute (BARI), Gazipur, Bangladesh.

S. K. BISWAS
IWM Division, Bangladesh Agricultural Research Institute (BARI),

M. A. HOSSAIN
IWM Division, Bangladesh Agricultural Research Institute (BARI),

S. HASSAN
IWM Division, Bangladesh Agricultural Research Institute (BARI),

Abstract/ Executive Summary:

The study was conducted to validate the Drought Assessment (DRAS) model developed by the Center for Environmental and Geographic Information Services (CEGIS) for irrigation scheduling of wheat (variety: Shatabdi). The performance of the model was compared with the results obtained from the BARI recommended irrigation schedule. The field experiments were carried out during the years 2005-2006 through 2007-2008 in two agro-ecological zones. The locations were RARS, Jamalpur under agro-ecological zone 9 and farmers’ field of FSR site, OFRD, Barind, Rajshahi under agro-ecological zone 26. Six different irrigation treatments including one rainfed with three replications were considered for the study. In respect of yield, BARI recommended irrigation practice performed better in Jamalpur (3.642 t/ha on average). Application of net irrigation requirement (NIR) as per DRAS model based on reported value yielded highest (3.598 t/ha on average) in the Barind area, Rajshahi. However, the yields from all irrigated treatments were very close to each other. From three years’ study, the model performance was found quite satisfactory for irrigated wheat, especially in drought prone areas like Barind, Rajshahi. In respect of water productivity, the model performed almost similar to the BARI recommended practice in Jamalpur. It performed better in Barind region where irrigation water was used by the crop more efficiently.

Keywords: DRAS model, Irrigation, Wheat.

Location: IWM Division, Bangladesh Agricultural Research Institute (BARI),

Start Date: 00-00-2005

End Date: 00-00-2008

Program Area: Knowledge Management

Non-commodity: Validation

Objectives:

The specific objectives of the study were: (i) to validate the model with field data at different locations; (ii) to compare the model predicted NIR with the BARI recommended water needs for wheat cultivation; (iii)to recommend the best practice for a specific location.

Methodology:

Wheat (Triticum aestivum L.) cv. Shatabdi (BARI Gam 21) was used as the test crop for the study. It is a high yielding variety released by the Wheat Research Centre, BARI (WRC, 2003). It performs better even in some delayed planting. It is semi-heat tolerant and is suitable to cultivate after harvest of transplanted Aman rice and can be cultivated throughout the country. The experiment was carried out during the rabi seasons of the years 2005-06 through 2007-08. The field studies were conducted at RARS farm, Jamalpur and farmer’s field of FSR site, OFRD, Barind, Rajshahi. Jamalpur site falls under Agro-ecological Zone 9 (Old Brahmaputra Floodplain). The texture of the sub-soil is clay loam over and under lain by clay loam and loam, respectively. The field capacity of the soil is 30% and the bulk density is 1.45 gm/cc. Rajshahi soil falls under Agro-ecological Zone 26 (High Barind Tract). The sub-soil texture is clay loam over and under lain by clay loam. The bulk density of the soil is 1.51 gm/cc and the field capacity 31.5%. The plot sizes were 4m × 5m in Jamalpur and 3m × 3m in Rajshahi. The experiment was arranged in a randomized complete block design (RCBD) with three replications. At all sites, fertilizers were applied as per recommended doses at the rate of 100, 35, 25, and 22 kg/ha of N, P, K, and S, respectively (BARI, 1999). Seeds were sown in second half of November during all the study years. The seed rate was 120 kg/ha. The crop was harvested in March of the cropping season. Soil moisture status in every plot was monitored by gravimetric method before each irrigation. BARI recommended irrigation treatment plots were irrigated upto field capacity of the soil and the other plots were irrigated as per recommendation of DRAS model. Yield and yield contributing parameters viz. plant height, spike length, grains per spike, 1000-grain weight, and grain yield were recorded. The following treatments were used in the study; T1 = No irrigation. T2 = Application of irrigation based on BARI recommended practice (irrigation at 21, 45, and 65 days after sowing). T3 = Application of net irrigation requirement (NIR) as per DRAS model based on reported value. T4 = Application of NIR as per DRAS model based on actual field data. T5 = Application of cumulative NIR as per DRAS model based on reported value. T6 = Application of cumulative NIR as per DRAS model based on actual field data.

Source of Information: Bangladesh J. Agril. Res. 35(3) : 403-411, September 2010 ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From the results, it is evident that DRAS model performs well in the drought prone locations as the plants can utilize the irrigated water in a better way. BARI recommended irrigation practice seems good for locations having adequate water holding capacity of soils and higher rainfall situation. However, the difference between other two systems in respect of yield being very low, DRAS model based irrigation scheduling may be advocated to wheat growing farmers of the country for its better water use capacity and water productivity

Knowledge Management: Journal