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Effect of Drought on Different Growth Stages of Aman Varieties

Dr M Towfiqul Islam
Senior Scientific Officer
Irrigation and Water Management Division, BRRI.

Dr M A Sattar
Head and Chief Scientific Officer
Irrigation and Water Management Division, BRRI.

Dr M Gous Ali
Head and Principle Scientific Officer, BRRI R/S, Rangpur
Agronomy Division, BRRI

Abstract/ Executive Summary:

Drought effect was different to different growth stages of aman rice. The most vulnerable stage was flowering reducing higher yield compare to other growth stages. Early prolonged drought at vegetative phase may hamper yield.

Keywords: Effect of drought, Different growth stages, Aman varieties

Location: Greenhouse, BRRI, Gazipur

Start Date: 01-07-2008

End Date: 30-06-2009

Program Area: Risk Management in Agriculture

Non-commodity: Rice, Drought

Objectives:

• To determine tolerance capacity of the aman variety in terms of amount and duration of drought during different growth phases • To document the changes in growing characteristics of the variety under different severity of drought • To determine the impact of different severity of drought on yield of the variety

Methodology:

How many days were required to become field capacity from saturated condition of the soil was determined. And the day just beyond the field capacity was considered as starting date of drought period because rice plant can transpire its potential rate even when soil moisture was around field capacity. But beyond field capacity existing soil moisture fails to meet evaporative demand of rice and thus the plant begins to run under drought condition. An irrigation schedule was design based on daily depletions of standing water in the pot including drought periods of different treatments. The treatments were: 1. Control (irrigated) 2. 5-day drought 3. 10-day drought 4. 15-day drought. There were three replications. These treatments were applied at vegetative, reproductive and ripening phase. The three drought periods were considered from maximum tillering stage to backward at vegetative, from PI to onward at reproductive and from flowering to onward at ripening phases.

Source of Information: Proceedings of BRRI Annual Internal Research Review, 2008-2009

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It was found that the same drought duration, the drought amount varied with the growth phase. The average panicle number per hill reduced from 9 to 4 (about 55%) due to 15-day drought at reproductive phase where as the averages remained all most same (about 9) in all drought duration at vegetative and ripening phases. So, drought reduces panicle number when it occurs at PI stage and the reduction level depends on drought severity. The result indicates that the flowering stage was more vulnerable to water stress than any stages of the crop in terms of spikelet sterility. Moreover, the prolonged drought at this stage may increase vulnerability resulting 100 percent sterility. All the drought duration at flowering had higher yield reduction than those at the other growth phases.

Knowledge Management: Report/Proceedings