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Development of Soil Moisture Declination Model for Alternate Wetting and Drying Irrigation in Rice Cultivation-2012

Dr M Mahbubul Alam
SSO
IWMD, BRRI

Dr M A Rashid
CSO and Head
IWMD, BRRI

Abstract/ Executive Summary:

A field experiment was conducted to study the soil moisture dynamics for AWD irrigation, to develop a model for prediction of soil moisture dynamics, to predict the time of irrigation using the model and to validate the model. Six water treatments were followed as T₁= Continuous standing water (1-5 cm) in levee without protection, T₂= Continuous standing water (1-5 cm) in levee protected with polythene sheet, T₃= AWD irrigation (upto 15 cm below ground level) in levee without protection, T₄= AWD irrigation (upto 15 cm below ground level) in levee protected with polythene sheet, T₅= AWD irrigation (upto 30 cm below ground level) in levee without protection and T₆= AWD irrigation (upto 30 cm below ground level) in levee in levee with protection. Highest yield was obtained from 15 cm AWD plots followed by continuous standing water plots and 30 cm AWD plots. Irrespective of treatments, higher yield was obtained from non-protected plots compared to the protected plots with polythene sheet in levee. The above data indicates that 15 cm AWD is the best water management practice for irrigated Boro production. Comparison of evapotranspiration, seepage & percolation, effective rainfall, irrigation requirement and irrigation applied data indicated existence of a continuous horizontal inflow of water in the plots from adjacent elevated field. So the supplied irrigation was much below the requirement. Therefore, soil moisture declination study is not possible in this plot and the experiment would be established in other plots in the next year.

Keywords: Soil moisture declination model, Alternate wetting and drying irrigation, Rice cultivation

Location: BRRI farm, Gazipur

Start Date: 01-12-2011

End Date: 30-06-2012

Program Area: Crop-Soil-Water Management

Commodity: Water management

Objectives:

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

Methodology:

Treatments

T₁= Continuous standing water (1-5 cm) in levee without protection

T₂= Continuous standing water (1-5 cm) in levee protected with polythene sheet

T₃= AWD irrigation (upto 15 cm below ground level) in levee without protection

T₄= AWD irrigation (upto 15 cm below ground level) in levee protected with polythene sheet

T₅= AWD irrigation (upto 30 cm below ground level) in levee without protection

T₆= AWD irrigation (upto 30 cm below ground level) in levee in levee with protection

Source of Information: Proceedings of the BRRI Annual Internal Review, 2012

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Highest yield was obtained from 15 cm AWD plots followed by continuous standing water plots and 30 cm AWD plots. Irrespective of treatments, higher yield was obtained from non-protected plots compared to the protected plots with polythene sheet in levee. The above data indicates that 15 cm AWD is the best water management practice for irrigated Boro production. Comparison of evapotranspiration, seepage & percolation, effective rainfall, irrigation requirement and irrigation applied data indicated existence of a continuous horizontal inflow of water in the plots from adjacent elevated field. So the supplied irrigation was much below the requirement.

Knowledge Management: Report/Proceedings