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Observational Trial (ot) to Develop Deep Water Varieties

M Amir Hossain
Senior Scientific Officer
Plant Breeding Division, BRRI.

M A Salam
Chief Scientific Officer
Plant Breeding Division.

M Matiar Rahman
Scientific Officer
Plant Breeding Division.

Abstract/ Executive Summary:

This study was conducted with the objective to identification of desirable improved DWR lines under control flooding and on-farm conditions. A total of 86 improve deep water rice genotypes were grown in the deep water tank# 2 and at Kalihati, Tangail. Control flooding (Tank Experiment): The experiment was submerged twice at the age of 15 and 21 days after seeding due to heavy rains and impairment of drainage system in the deep water tank.Th trail was abandoned. On-farm (Kalihati, Tangail). The crop was growing satisfactorily up to the flooding depth of 64 cm. The crop was submerged at 40 days after seeding (DAS) due to the sudden rise of flood depths @ > 15 cm per day for 6 consecutive days. the flood depth was raised to the height 192 cm within 15 days. the slow elongating rice genotypes could not crop up with the sudden and high rates of increasing flood water. The submergence was coupled with turbid water that caused substantial damage to the rice plants by impairing their photosynthetic activity. At the end of July, flood water started to recede while the rice crop was totally damaged. The popular DWR variety Chamara was used as check. Also, Chamara did not survive at this flooding pattern.

Keywords: Improved DWR lines, Control flooding and on-farm conditions. , Observational Trail, Deepwater rice.

Location: BRRI,Kalihati,Tangail,DWT.

Start Date: 01-07-2004

End Date: 30-06-2005

Program Area: Variety and Species

Commodity: Rice

Objectives:

Identification of desirable improved DWR lines under control flooding and on-farm conditions.

Methodology:

A total of 86 improve deep water rice genotypes were grown in the deep water tank# 2 and at Kalihati, Tangail. Control flooding (Tank Experiment): Dry direct was done on 2 May. The unit plot size was 5.0 m x 4 row. The row spacing was 25 cm and plots were 1.0 m apart. On-farm (Kalihati, Tangail): A total of 67 improved deep water rice genotypes along with two local checks were grown for evaluation. The experiment was seeded in dry direct seeding method on June 07 IFM site Kalihati, Tangail. The unit plot was 4.0 x 4 row with 25 cm spacing between rows. Fertilizers @ 50:20:10 kg NPK/ha were applied. Other crop management practices were done in time. Data on flooding patterns were recorded.

Source of Information: BRRI. Proceedings of the BRRI Annual Internal Review for 2004-2005. Bangladesh Rice Research Institute (BRRI). Gazipur -1701.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The submergence was coupled with turbid water that caused substantial damage to the rice plants by impairing their photosynthetic activity. At the end of July, flood water started to recede while the rice crop was totally damaged. The popular DWR variety Chamara was used as check. Also, Chamara did not survive at this flooding pattern.

Knowledge Management: Report/Proceedings