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Terminal Drought Mitigation Adopting Transplanting Dates in T. Aman, 2013

Dr. M Towfiqul Islam
SSO
Irrigation and Water Management Division, BRRI, Gazipur-1701, Bangladesh.

Md. Belal Hossain
SO
Irrigation and Water Management Division, BRRI, Gazipur-1701, Bangladesh

Abstract/ Executive Summary:

A field experiment was conducted to determine effect of drought for different transplanting dates and to determine drought severity and its probability at different growth stages of T. Aman. A long duration variety (BR11) and a short duration variety (BRRI dhan33) were tested during T. Aman season. There were six treatments with three replications in the experiment and the treatments were transplanting date 10 July (T₁), transplanting date 17 July (T₂), transplanting date 24 July (T₃) and transplanting date 31 July (T₄), transplanting at 7 August (T₅), transplanting at 14 August (T₆). The historical rainfall data were collected from the Department of Agricultural Extension, Kushtia. Drought amount (deficit water in soil) was calculated using drought model (developed by Dr. Towfiqul Islam). Drought is an unpredictable phenomenon and it reappears after 5-10 years. But we can’t forecast the year of occurrence. Short duration variety faced fewer droughts due to its shorter growth duration. But both short and long duration variety faced fewer droughts when they transplanted before 24 July. So transplanting before 24 July would be medium risk period of drought and after that that would be high risk period. BRRI dhan33 yielded highest (5.1 t/ha) when it was transplanted on July24. Lowest yield was found 4.5 t/ha when it was transplanted on 14 August. For BR11, the highest yield was found for July 24 transplanting (5.9 t/ha). Lowest yield was observed in case of 14 August (5.1 t/ha) transplanting. In both cases yield decreased after transplanting on 24 July.

Keywords: Terminal drought mitigation, Drought amount, Drought model

Location: Kushtia

Start Date: 00-00-2002

End Date: 00-00-2013

Program Area: Risk Management in Agriculture

Commodity: Rain water

Objectives:

To determine effect of drought for different transplanting dates
To determine drought severity and its probability at different growth stages of T. Aman.

Methodology:

A long duration variety (BR11) and a short duration variety (BRRI dhan33) were tested during T. Aman season. There were six treatments with three replications in the experiment and the treatments were transplanting date 10 July (T₁), transplanting date 17 July (T₂), transplanting date 24 July (T₃) and transplanting date 31 July (T₄), transplanting at 7 August (T₅), transplanting at 14 August (T₆). Thirty-day old rice seedlings were transplanted with 20 cm x 20 cm spacing. Individual plot size was 5m x 3m with 60 cm buffer zones. A USWB Class A evaporation pan and a rain gauge were installed near the experimental field to determine rainfall and evaporation amounts during the growing season of rice. Data were recorded at 09:00h daily to determine seepage & penetration, rainfall and evaporation from the experimental field. The historical rainfall data were collected from the Department of Agricultural Extension, Kushtia. Drought amount (deficit water in soil) was calculated using drought model (developed by Dr. Towfiqul Islam).

Source of Information: Proceeding 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:

The annual rainfall amount from 2002 to 2013 was analyzed. A downward trend of rainfall indicates rainfall amount is decreasing year after year. More terminal drought may cause due to climate change. In 2013, total annual rainfall was 1060 mm which is considerably less than average annual rainfall (1385 mm) in this region. Rainfall exceeds the average amount only in the month of April, August and October. BRRI dhan33 suffered comparatively less drought than BR11 due to its shorter growth duration. Short duration variety would be suffered drought both reproductive and ripening stages if it is transplanted beyond 24 July. In other word, when short duration variety transplanted before 24 July it can escape terminal drought. In ripening phase severe drought occurred transplanting after 24 July. The analysis shows that long duration variety faces less drought during critical stages (reproductive & ripening stags) when it is transplanted not beyond 17 July. But it suffers more drought during critical stages if it is transplanted beyond 24 July. BRRI dhan33 yielded highest (5.1 t/ha) when it was transplanted on July24. Lowest yield was found 4.5 t/ha when it was transplanted on 14 August. For BR11, the highest yield was found for July 24 transplanting (5.9 t/ha). Lowest yield was observed in case of 14 August (5.1 t/ha) transplanting. In both cases yield decreased after transplanting on 24 July.

Knowledge Management: Report/Proceedings