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Effect of Different Doses and Time of Ga3 Application on Hybrid Rice Seed Production of Promising Hybrids

Md. Kamal Hossain
Senior Scientific Officer
Hybrid Rice Division Bangladesh Rice Research Institute Gazipur-1701

Dr. Md. Jamil hasan
Principal Scientific Officer
Head Hybrid Rice Division Bangladesh Rice Research Institute Gazipur-1701

Abstract/ Executive Summary:

Determination of row ratio and spacing is very important for hybrid rice seed production. Specific row ratio and spacing is required for a particular hybrid combination. Row ratio and spacing depends on floral characters of CMS lines, pollen load of restorer lines and tillering ability of both the lines. Among the twelve tested treatments height seed yield (2.6t/ha) was obtained from the treatment with GA₃ @ 60 gm/ha at 5% and 15-20 % flowering stages

Keywords: GA3 dose, Time of application, Seed production

Location: BRRI HQ, Gazipur

Start Date: 07-12-2007

End Date: 31-05-2008

Program Area: Seed Technology

Commodity: Rice

Objectives:

To find out the effective dose of GA₃ and its time of application on hybrid rice seed production

Methodology:

One CMS line (BRRIIA) along with its restorers (BR168R) was grown as parental materials. Restorer was sown in three different dates at five days interval and CMS line was sown along with second set of its respective R line. After ten days, fertilizers were applied @ 7 gm, 4 gm and 7 gm urea, TSP and MP respectively in per sq. m of seed bed. Thirty days old seedlings were transplanted in a 20 m² plot at a spacing of 20 cm x 15 cm with 2:8 ratios to R and A line using RCB design with 3 replications. GA₃ concentration viz.0, 40, 60 and 80 gm per hectare at 5%, 15-20% and 35-40% flowering stages were applied as treatments and no chemical were used incase of control. Twelve combinations of treatment were done as GA₃ concentrations vs flowering stages. Fertilizers @ 270:130:120:70:10 kg/ha Urea TSP-MP-Gypsum-Zinc sulphate were applied. Intercultural operations, rouging, and supplementary pollination were performed when necessary.

Source of Information: BRRI Annual Report 2007-2008,Page no.238, BRRI, Gazipur-1701,Bangladesh

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 75000/_

Total Budget (Tk.) : 75000/_

Achievement/Findings:

Among the twelve tested treatments height seed yield (2.6t/ha) was obtained from the treatment with GA₃ @ 60gm/ha at 5% and 15-20 % flowering stages

Knowledge Management: Report/Proceedings