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Terminal Drought Mitigation by Adopting Transplanting Date in T. Aman Season Under Climate Change Situation-2010

Debjit Roy
SSO
IWMD, BRRI

Dr. M Towfiqul Islam
PSO and Head
IWMD, BRRI

Dr. M A Rashid
CSO & Head
IWMD, BRRI

Abstract/ Executive Summary:

A field experiment was conducted at Baradi farm, IETC, Kushtia to observe drought severity at critical stages of rice, to determine effect of drought for different transplanting date and to determine yield for different transplanting date. The treatments were:T₁= Date of Transplanting 10 July, T₂ = Date of Transplanting 17 July, T₃ = Date of Transplanting 24 July and T₄ = Dater of Transplanting 31 July. A long duration variety (BR11) and a short duration variety (BRRI dhan33) of T. Aman season were used as the test varieties for the experiment. Due to its shorter growth duration, BRRI dhan33 suffered comparatively less drought than BR11. For BRRI dhan33, the highest drought amount was observed for transplanting date 31 July and the lowest for transplanting date 17 July. BRRI dhan33 transplanted in 10 July and 17 July faced drought in vegetative stage (61.97 mm and 20.89 mm, respectively). Drought in ripening stage was observed for all dates of transplanting except 10 July. Drought amount in reproductive stage was not considerable in any treatment. In case of BR11, the highest and the lowest drought amount were observed for transplanting dates 10 July (115.09 mm) and 24 July (81.99 mm), respectively. Major part of drought was observed in ripening stage for each transplanting date. Rice transplanted in 10 July and 31 July did not face drought at reproductive stage and vegetative stage, respectively. BRRI dhan33 gave the highest yield (4.60 t/ha) for transplanting in 24 July. That rice did not suffer from drought during its vegetative and reproductive stages. However, it faced relatively higher drought in ripening stage. The next highest yield was observed for date of transplanting 31 July (4.23 t/ha). In other two treatments, yields were comparatively lower than that of 24 July and 31 July. Considerable amount of drought was observed in vegetative stages of rice transplanted in 10 July and 24 July. For BR11, the highest yield found for 17 July (4.35 t/ha) and lowest yield observed for 31 July (3.72 t/ha). The drought amount was severe at reproductive stage for the rice transplanted in 31 July. Though higher amount of drought was observed for 17 July at ripening stage, drought was relatively less during vegetative stage and reproductive stage.

Keywords: Terminal drought, Drought amount, T. Aman season, Climate change

Location: Baradi farm, IETC, Bangladesh Water Development Board, Kushtia

Start Date: 01-07-2009

End Date: 30-12-2009

Program Area: Risk Management in Agriculture

Non-commodity: Drought

Objectives:

To observe drought severity at critical stages of rice
To determine effect of drought for different transplanting date
To determine yield for different transplanting date

Methodology:

The experiment was set-up in Randomized Complete Block Design (RCBD) at Baradi farm, IETC, Bangladesh Water Development Board, Kushtia during Aman season 2009-10 with four treatments and was replicated thrice. The treatments were:T₁= Date of Transplanting 10 July, T₂ = Date of Transplanting 17 July, T₃ = Date of Transplanting 24 July and T₄ = Dater of Transplanting 31 July. A long duration variety (BR11) and a short duration variety (BRRI dhan33) of T. Aman season were used as the test varieties for the experiment. BRRI recommended cultural and fertilizer management practices were followed. Seedlings were raised outside the experimental field and 30 days old seedlings were transplanted with 20 cm x 20 cm spacing. Individual plot size was 4m x 5m, separated by 20 cm x 40 cm levees. Fertilizer was applied as per BRRI recommendation. The whole amount of P, K, Zn and S were applied as basal during the of final land preparation. Urea was top-dressed in three equal splits. Weeding and spraying were done twice to control weeds and attack of insect-pest in each season. Ten square meter area of each plot was harvested to determine the rice yield. Harvested paddy was threshed, cleaned and weighed to determine yield. Finally, the yield was adjusted to 14% moisture content to determine yield per hectare. A rain gauge was installed near the experiment field for determining rainfall during the growing season of rice. Rainfall data were collected from Department of Agricultural Extension, Kushtia. The drought amount was calculated using drought model.

Source of Information: Proceedings of the BRRI Annual Internal Review for 2010

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Drought at ripening stage may be less harmful for rice than that at vegetative and reproductive stages. Considering drought amount at different stages of growth and yield of T. Aman 2009 rice, dates of transplanting 24 July and 31 July can be suitable for short duration variety like BRRI dhan33. In general, transplanting period from 24 July to 31 July was found appropriate to escape terminal drought. For long duration variety as BR11, date of transplanting 17 July and 24 July can be recommended.

Knowledge Management: Report/Proceedings