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Manipulations of Seeding Date and Seedling Age to Avoid Flash Flood Damage of Boro Rice at the Northeastern Haor Areas of Bangladesh

JK Biawas
Director General
BRRI, Gazipur

MS Hossain
PSO
Training Division BRRI Gazipur

MSI Mamin
CSO
Adaptive Research Division BRRI, Gazipur

MA Muttaleb
PSO
RFS Division BRRI Gazipur

Abstract/ Executive Summary:

Flash flood (20-100 cm) may damage boro rice at the haor area in northeastern Bangladesh. Early crop establishment (late October to early November seeding) to avoid the flash flood is not possible as the crop might encounter low night temperature in late February to early March as its reproductive phase. Therefore to find out a technology to avoid stress, three experiments were conducted in Boro season from 2003-2005, manipulation seeding date and seedling age. Grain yield was reduced significantly in late seeding. The highest yield could be achieved using 15-30 days old seedlings. The growth duration increased with the increase of seedling age and decrease of apparently low minimum temperature. A day increase of seedling age would increase half a day of growth duration. Therefore, a safe harvest (by 30 April) in dependent to seedling age and nature of low temperature in the cropping season. Forty five day old seedlings from mid November seeding and 30 day old seedlings from early December seeding of BRRI dhan29 could yield the safe harvest. BRRI dhan28 was quite safe even up to mid December seeding provided 30 day old seedlings be used.

Keywords: Seeding data, Seedling age, Flash flood, Boro rice, Haor area

Location: BRRI, R/S, Habiganj

Start Date: 00-00-2003

End Date: 00-00-2005

Program Area: Risk Management in Agriculture

Commodity: Rice

Objectives:

To observes the influencers of seeding date and seedling age on yield without any risk of flash flood at the maturity.

Methodology:

Experiment 1. The study was conducted with BRRI dhan29 (long duration) following two crop established methods: Directly seedling of sprouted seeds and transplanting of 30 days old seedlings. Two operations: sowing of sprouted seeds directly onto the experimental field and sowing on sprouted seeds onto seed bed to raise seedlings upto 30 days were done on the same dates. The seeding dates were 7 and 21 November 2002, 5 and 21 December 2002. The experiment was laid out RCBD with three replications. Experiment 2. The study was conducted with BRRI dhan28 (short duration) and BRRI dhan29. Seeding with sprouted seed was done as in experiment 1. Thirty and 60 days old seedlings were transplanted at 25x15 cm spacing. The experiment was conducted in a split-split plot design with three replications. Seedling age was in the main plot. The sub plot and sub-sub plot were assigned to variety and seeding date, respectively. Experiment 3. Sprouted seeds of BRRI dhan29 were seeded on 21 November 2004 and 5 December 2004. Fifteen, 30, 45, 60 and 75 day old seedlings were transplanted in a split plot design with three replication. The main plot was assigned to seeding date and sub plot to seedling age. Fertilizer and all other relevant cultural practices were followed as per BRRI recommendation. Data on yield, flowering data and minimum temperature during the growth period, flowering, maturity date and growth duration were recorded. Yield data were analyzed using IRRISTAT. As the variation among the replications was minimum or none among the growth durations no analysis was performed. Minimum temperature date was collected from BRRI Habiganj weather observation. Raw data analysis and graphical works were performed by MS Excel.

Source of Information: Bangladesh Rice Journal,13(1):57-61,2008

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The highest grain yield could be achieved using 15-30 days old seedlings. The growth duration increased with the increase of seedling age. A day increase of seedling age would increase half a day of growth duration. The low temperature also has a role in increasing growth duration. Therefore, a safe harvest (by 30 April) is dependent on seedling age and nature of low temperature in the cropping season. Forty five day old seedling from mid November seeding and 30 day old seedling from early December seeding of BRRI dhan29 could yield a safe harvest. In contrast, relatively short duration BRRI dhan28 was quite safe even upto mid December seeding provide 30 day old seedlings are used in haor areas of Bangladesh.

Knowledge Management: Journal