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Determination of Suitable Time for Application of Supplemental Irrigation in T. Aman 2012

Dr. Md. Taufiqul Islam
PSO and Head
IWMD, BRRI

Debjit Roy
SSO
IWMD, BRRI

Abstract/ Executive Summary:

A field experiment was conducted to determine the relationship between perched water tables depletion during critical stages of rice and grain yield. BRRI dhan49 was used in this experiment during T. Aman 2012 season. There were three treatments with three replications in the experiment and the treatments were:T₁ = Supplemental irrigation when water level reaches at 5 cm below ground surface; T₂= Supplemental irrigation when water level reaches at 10 cm below ground surface; and T₃= Supplemental irrigation when water level reaches at 15 cm below ground surface. BRRI recommended cultural and fertilizer management practices were followed in growing the crop. Thirty-day-old rice seedlings were transplanted after proper land preparation with 20 cm x 20 cm spacing. Individual plot size was 5 m x 3 m, separated by 60 cm buffer zone. Supplemental irrigation was applied according to different treatment (T₁, T₂ and T₃). A USWB Class A evaporation pan and a rain gauge were installed near the experimental field for determining rainfall and evaporation amounts during the growing season of rice. Data were recorded at 08:30h daily to determine seepage & percolation, rainfall and evaporation from the experimental field. In terms of yield performances, T₃ performed slightly better than the other two treatments. So these results do not indicate any suitable time of irrigation application (suitable water depth below ground surface). From the results of 2011 and 2012 it was found that the depth of perch water Table below up to 15 cm does not create drought in the soil. It may be expected that the depth of perch water Table more than 15 cm will create drought. So the experiment with different perch water Table (more than 15 cm) is needed to determine the beginning time of drought and actual time for supplemental irrigation.

Keywords: Terminal drought mitigation, Drought amount, Supplemental irrigation, T. Aman Rice

Location: Kushtia

Start Date: 01-07-2012

End Date: 30-12-2012

Program Area: Crop-Soil-Water Management

Commodity: Supplemental irrigation

Objectives:

To determine the relationship between perched water tables depletion during critical stages of rice and grain yield.

Methodology:

BRRI dhan49 was used in this experiment during T. Aman 2012 season. There were three treatments with three replications in the experiment and the treatments were: T₁ = Supplemental irrigation when water level reaches at 5 cm below ground surface; T₂= Supplemental irrigation when water level reaches at 10 cm below ground surface; and T₃= Supplemental irrigation when water level reaches at 15 cm below ground surface. BRRI recommended cultural and fertilizer management practices were followed in growing the crop. Thirty-day-old rice seedlings were transplanted after proper land preparation with 20 cm x 20 cm spacing. Individual plot size was 5 m x 3 m, separated by 60 cm buffer zone. Supplemental irrigation was applied according to different treatment (T₁, T₂ and T₃). A USWB Class A evaporation pan and a rain gauge were installed near the experimental field for determining rainfall and evaporation amounts during the growing season of rice. Data were recorded at 08:30h daily to determine seepage & percolation, rainfall and evaporation from the experimental field.

Source of Information: Proceedings of the BRRI Annual Internal Review for 2013, BRRI, Gazipur-1701, Bangladesh

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Only critical stages (mainly reproductive and ripening stages) were considered. Because yield is seriously hampered if crop suffered from water stresses during these periods. The rainfall was mostly occurred in the vegetative part of the crop, but it was not uniformly distributed. So, a supplemental irrigation was applied in vegetative stage. Then irrigation was applied in most critical stages, i.e., reproductive stage and in early part of ripening stage. The number of supplemental irrigation application was three, two and one for the treatments T₁, T₂and T₃. The depth of irrigation water was 5 cm above the ground surface in all irrigation applications. There were no considerable yield differences among the treatments . The highest yield was found in T₃ (6.39 t/ha) and the lowest in T₂ (6.15 t/ha).

Knowledge Management: Report/Proceedings