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Determination of Suitable Row Ratio and Spacing for Increasing Seed Yield of Hybrid Rice.

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.Highest seed yield was found from 2:10 row ratio with 15 cm x 15 cm planting spacing (2.80 t/ha). Row ratio 2:8 showed highest out crossing rate with 15 cm x 15 cm spacing followed by row ratio 2:8 with 20 cm x 20 cm spacing.

Keywords: Row ratio, Spacing, F1 seed production

Location: BRRI HQ, Gazipur

Start Date: 03-12-2007

End Date: 31-05-2008

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To find out the optimum row ratio and spacing for hybrid rice seed production

Methodology:

The experiment was conducted using one A line (IR58025A) along with it’s restorer (BRRI10 R). Restorer was sown in three different date at five days interval and CMS line was sown in the same date of second set of it’s restorer line. Thirty days old seedlings were transplanted at a spacing of 15 cm x 15 cm, 20 cm x 15 cm and 20 cm x 20 cm with 2:8, 2:10, 2:12 and 2:14 row ratio of R and A line using RCB factorial design with 3 replications Fertilizers @ 270:130:120:70:10 kg/ha urea TSP MP gypsum and ZnSO4, respectively were applied. Intercultural operations, rouging, GA₃application and supplementary pollination were performed when required.

Source of Information: BRRI Annual Report 2007-2008 page no.25

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 50000/-

Total Budget (Tk.) : 50000/-

Achievement/Findings:

Highest seed yield was found from 2:10 row ratio with 15 cm x 15 cm planting spacing (2.80 t/ha). Row ratio 2:8 showed highest out crossing rate with 15 cm x 15 cm spacing followed by row ratio 2:8 with 20 cm x 20 cm spacing

Knowledge Management: Report/Proceedings