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Effect of Drought on Different T. Aman Varieties-2013

Dr M Mahbubul Alam
SSO
Irrigation and Water Management Division, BRRI, Gazipur-1701, Bangladesh.

Dr M A Rashid
CSO and Head
Irrigation and Water Management Division, BRRI, Gazipur-1701, Bangladesh.

Abstract/ Executive Summary:

A field experiment was conducted to study the relative drought tolerance of the T. Aman varieties based on the yield performance, and to find out suitable T. Aman variety for drought prone area. A total of 12 popular T. Aman varieties were grown under irrigated and rainfed environment. These varieties were classified into 3 categories based on the growth duration. There were 2 short duration (BRRI dhan33 and BRRI dhan39), 3 medium duration (BR25, BRRI dhan31 and BRRI dhan49) and 7 long duration (BR11, BR23, BRRI dhan30, BRRI dhan40, BRRI dhan41, BRRI dhan44 and BRRI dhan46) varieties. Two water management treatments were as follows as T₁- Rainfed condition and T2 - Supplementary irrigation when water stress is observed. A 25 cm long PVC pipe having 15 cm perforation at the bottom end was installed in the plot to assess the water stress condition. Based on the three years study results, BRRI dhan30, BRRI dhan31 and BRRI dhan40 are found more drought tolerant than the other study varieties. These varieties can be grown in drought prone areas to minimize the yield loss.

Keywords: Supplemental irrigation, Terminal drought, Drought mitigation

Location: BRRI farm, Gazipur

Start Date: 01-07-2013

End Date: 30-12-2013

Program Area: Risk Management in Agriculture

Commodity: Rice

Objectives:

To study the relative drought tolerance of the T. Aman varieties based on the yield performance
To find out suitable T. Aman variety for drought prone area

Methodology:

A total of 12 popular T. Aman varieties were grown under irrigated and rainfed environment. These varieties were classified into 3 categories based on the growth duration. There were 2 short duration (BRRI dhan33 and BRRI dhan39), 3 medium duration (BR25, BRRI dhan31 and BRRI dhan49) and 7 long duration (BR11, BR23, BRRI dhan30, BRRI dhan40, BRRI dhan41, BRRI dhan44 and BRRI dhan46) varieties. Two water management treatments were as follows as T₁- Rainfed condition and T₂ - Supplementary irrigation when water stress is observed. A 25 cm long PVC pipe having 15 cm perforation at the bottom end was installed in the plot to assess the water stress condition. The soil inside the pipe was removed to monitor the perched water level. No water in the pipe indicated water stress for the crop and immediately supplementary irrigation was applied in T₂ plots.The seeding was done on 2^nd July 2013 and transplanting on 5^th August 2013. TSP, MP, Gypsum and Zinc Sulphate were applied during the last ploughing. Urea were top dressed twice during the vegetative growth. Weeding were done after Urea applications. The rainfed plots were separated from the irrigated plots with 1 m buffer area. The outer sides of the levee in rainfed plots were covered with polythene sheet to protect seepage from irrigated plots. The perched water level status in the plots was monitored by installing perforated PVC tubes. Supplemental irrigation was applied in the irrigated plots when water level reaches 15 cm below the ground surface.

Source of Information: Proceedings 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:

Mean yield of the varieties were from 2.86 to 4.18 t/ha under rainfed condition and 3.50 to 5.94 t/ha under supplementary irrigated condition. It shows that yield reduction is lowest in BRRI dhan31 (9.4%) and highest in BRRI dhan41 (38.0%). The results show that BRRI dhan30, BRRI dhan40 and BRRI dhan41 also have drought tolerance compared to the other tested varieties. Highest yield reduction was found in BR41 followed by BR11, BRRI dhan46 and BR 23 with yield loss of 38, 32, 30 and 28 percent, respectively. Considering 3 years results indicated that BRRI dhan30, BRRI dhan31 and BRRI dhan40 are more drought tolerant than the other varieties. BRRI dhan31, BRRI dhan30, BRRI dhan40 and BRRI dhan44 are tolerant to drought. BRRI dhan39, BR 25 and BRRI dhan49 are moderately tolerant to drought. BR 11, BR 23, BRRI dhan33, BRRI dhan41 and BRRI dhan46 are sensitive to drought stress.

Knowledge Management: Report/Proceedings