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Multivariate Analysis of BRRI Varieties

DR. D.N.R. Poul
CSO and Head
Agricultural Statistics Division, BRRI, Gazipur

Monatosh Howlader
SSO
Agricultural Statistics Division, BRRI, Gazipur

Md. Shahjahan Kabir
SSO
Agricultural Statistics Division, BRRI, Gazipur

Abstract/ Executive Summary:

The experiment was conducted in Boro 2001-02 with 20 varieties. But BR16 was damaged and were excluded from the analysis. Mahalanobis D² –values were determined and the varieties were grouped such that the varieties within a group are similar while varieties in different groups are dissimilar. Panicle length (PL) was found to be the most variable plant character with CV=25.7% for rice yild.From the analysis of variances of rice yield and different plant characters, Panicle length (PL) was found to be the most variable plant character with CV=25.7% followed by effective tillers /hill (TN) with CV = 19.9%. Days to 50% flowering (DAF) was the least variable character with CV=0.7% followed by 1000 grain weight with CV= 1.8%. For all plant characters, the F-values were significance at 1% level except panicle length, which was significance at 5% level.

Keywords: Relative contribution, Rice yield, RCBD, Phenotypes, T.Aman and Boro

Location: BRRI HQ, Gazipur and all R/S of BRRI

Start Date: 30-06-2001

End Date: 31-07-2002

Program Area: Socio-economic and Policy

Non-commodity: Rice, Performance

Objectives:

To identify the contribution of rice plant characters to the total divergence and
To identify the factors causing diversity among the BRRI released varieties (genotypes)

Methodology:

It was conducted in RCBD with three replications. The experimental plot size was 9 x4 m and spacing was 20X20 cm. Recommended doses of fertilizer were applied. Insecticides were sprayed and irrigation was applied as and when required. Each experimental plot was divided into two parts- one for sampling (termed as sampling area) and the other for estimating yield (termed as harvest area for yield estimate). The size of harvest area was 10 m² and that for sampling area was 26 m². At dough stage, 8 hills were randomly selected from the sampling area and the middle tallest tiller from each selected hill was cut separately from the sampling area and measured flag leaf angle (in^O), flag leaf area (cm²), area of all leaves (cm²), weight of all leaves (gm) and dry weight of all leaves (gm) in the laboratory. At maturity, 10 hills were randomly selected from the same sampling area and measured plant height (cm), number of effective tillers, panicle length for each tiller (cm), number of filled grains/hill, number of unfilled grains/hill, number of spikeletes/panicle and 1000- grain weight (gm). The harvest area was harvested separately for each plot and the yield was adjusted at 14% moisture content.

Source of Information: BRRI Annual Report 2002-2003

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 200000

Total Budget (Tk.) : 200000

Achievement/Findings:

From the contributions of different plant characters to variety divergence, among the eight plant characters, days to 50% flowering made the largest contribution to total divergence followed by 1000 grain weight and plant height. The character contributing most to total divergences were DAF, 1000-grain weight and plant height and their respective contributions were 40.4%, 23.4% and 19.9%. The least contributing character was number of field grain/panicle, while the contribution of number of tillers/ hill to total divergence was nil.the closer and distant pairs of varieties measured by Mahalonobis D2. Among the 19 varieties, the pair (BR7 and BR19) is the closest followed by the pair (BR15 and BRRI dhan35). On the other hand, (BR8 and BR3) is the most distant pair followed by the pair (BR1 and BR3).

Knowledge Management: Report/Proceedings