Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Development of Soil Moisture Declination Model for Alternate Wetting and Drying (awd) Irrigation for Rice Cultivation.-2014

Dr. Md. Mahbubul Alam
SSO
Irrigation and Water Management Division, BRRI, gazipur-1701, Bangladesh.

Dr. M. A. Rashid
CSO and Head
Irrigation and Water Management Division, BRRI, gazipur-1701, Bangladesh.

Abstract/ Executive Summary:

A field experiment was conducted to study the soil moisture dynamics of AWD irrigation, to develop a model for prediction of soil moisture dynamics, and to predict the time of re-irrigation using the model. Experiment was set up in BRRI farm, Gazipur, in Boro season 2014. The experiment contains six treatments and each of them was replicated thrice. The treatments were: T₁ = Continuous standing water (CSW), T₂= CSW with polythene protection around the field and levee, T₃ = Irrigation when water level 15 cm below GL, T₄= T₃ with polythene protection around the field and levee, T₅ = Irrigation when water level 30 cm below GL and T₆= T₅ with polythene protection around the field and levee. RCB design was followed. BRRI dhan28 was the tested variety. The highest number of irrigation (17) was found in continuous standing water and lowest (10) in Irrigation when water level 30 cm with polythene. Total amount of irrigation applied in T₁, T₂, T₃, T₄, T₅ and T₆ during the growth season were 700, 584, 539, 482, 405 and 356 mm, respectively.Highest yield was obtained from continuous standing water plots (T1=5636 kg/ha, T2=5563 kg/ha) followed by 15 cm (T3=4951 kg/ha, T4=4894 kg/ha) and 30 cm (T5=4896 kg/ha, T6=4676 kg/ha) AWD plots.Water productivity was highest for treatment T₅ (7.25 kg/ha-mm) and lowest for T₁(5.63 kg/ha-mm).

Keywords: Soil moisture declination model, Alternate wetting and drying irrigation, Water productivity

Location: BRRI farm, Gazipur

Start Date: 00-00-2014

End Date: 00-00-2014

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To study the soil moisture dynamics of AWD irrigation
To develop a model for prediction of soil moisture dynamics
To predict the time of re-irrigation using the model

Methodology:

Experiment was set up in BRRI farm, Gazipur, in Boro season 2014. The experiment contains six treatments and each of them was replicated thrice. The treatments were: T₁ = Continuous standing water (CSW), T₂= CSW with polythene protection around the field and levee, T₃ = Irrigation when water level 15 cm below GL, T₄= T₃ with polythene protection around the field and levee, T₅ = Irrigation when water level 30 cm below GL and T₆= T₅ with polythene protection around the field and levee. RCB design was followed. BRRI dhan28 was the tested variety. Seeding was done on 30^th November 2013. Fifty days old seedlings were transplanted on 20^th January 2014. Individual plot size was 5 m x 4 m and each plot was separated from others with 1 m buffer area. A spacing of 20 cm x 20 cm was maintained. Recommended fertilizer management and cultural practices were followed. To protect seepage losses polyethylene sheets were placed around the plots and levees of treatment T₂, T₄and T₆. Irrigations were applied by measuring with a flow meter. Soil samples were collected from different depths to determine the moisture content under different water level condition. In the continuous standing water plots, a closed bottom cylinder (steel drum) was placed to determine the daily evapotranspiration. A slopping gauge was installed in the drum to measure the daily water level in the drum. Partially perforated PVC pipe were installed in each plots to measure the daily water level.

Source of Information: Proceedings of the BRRI Annual Review for 2014, BRRI, gazipur-1701, Bangladesh

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

For land preparation (LP) 210 mm irrigation water was applied in the field. The number of irrigation was highest in T₁ (17) and lowest in T₆ (10). Total amount of irrigation applied in T₁, T₂, T₃, T₄, T₅ and T₆ during the growth season were 700, 584, 539, 482, 405 and 356 mm, respectively. A total of 90 mm rainfall was recorded during the field growth span. Treatments with polythin protected plots saves more water than the non-protected plots.Highest yield was obtained from continuous standing water plots (T1=5636 kg/ha, T2=5563 kg/ha) followed by 15 cm (T3=4951 kg/ha, T4=4894 kg/ha) and 30 cm (T5=4896 kg/ha, T6=4676 kg/ha) AWD plots. Yield were much lower in T₃ and T₄ plots compared to T₁ and T₂ plots for uncontrolled water stress occurred during the reproductive phase due to problem of irrigation pump (DTW). Irrespective of treatments, higher yield was obtained from non-protected plots compared to the ploythin protected plots. This may be due to the obstruction of the border plants to extract nutrients from adjacent areas. Water productivity was highest for treatment T₅ (7.25 kg/ha-mm) and lowest for T₁(5.63 kg/ha-mm). Yield loss was highest in T₆ (17%) and lowest in T₂ (1.3%). Therefore, considering yield loss, water productivity and water saving T₂ and T₄are found better than the others for irrigated rice cultivation.

Knowledge Management: Report/Proceedings