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Variability of Different Growth Contributing Parameters of Some Okra (abelmoschus Esculentus L.) Accessions and Their Interrelation Effects on Yield

A. K. M. A. ALAM
School of Agriculture and Rural Development, Bangladesh Open University, Gazipur-1705, Bangladesh

M. M. HOSSAIN
Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

The objectives of the study were to assess the variability of growth contributing characters of 50 okra (Abelmoschus esculentus L.) accessions and their interrelation effects on the yield of green pods. The experiment was undertaken at the Horticulture Farm of Bangladesh Agricultural University, Mymensingh during the period from February to May, 2002. There was a wide range of variation for spread of plant (43.73 cm), height of plant (80.90 cm) and length of petiole (12.31 cm). Moderate variation for number of nodes per plant (14.58), number of leaves per plant (24.51 at 80 DAS), length of leaf (12.20 cm), breadth of leaf (13.05 cm); and lesser variation for number of primary branches per plant (1.57) was observed. The yield of green pod varied significantly and ranged from 4.39 t/ha (accession 19) to 12.77 t/ha (accession 69) with the average value of 7.86 t/ha. Number of primary branches per plant, which showed a lesser range of variation, recorded the highest genotypic co-efficient of variation (GCV= 26.56%) and also the highest phenotypic co-efficient of variation (PCV = 32.37%). A moderate GCV and PCV were recorded in case of length of petiole (GCV = 14.24% and PCV = 15.95%), spread of plant (GCV = 12.00% and PCV = 13.06%), breadth of leaf (GCV = 9.81% and PCV = 12.41%) and length of leaf (GCV = 9.53% and PCV = 13.35%). These characters suggested the existence of justifiable genetic and phenotypic distance among different accessions. Correlation co-efficient between yield and growth contributing parameters indicated that yield of green pod had highly significant positive association with the number of nodes per plant. Path analysis of different growth contributing parameters showed that number of nodes per plant directly contributed towards the yield of green pod.

Keywords: Okra accessions, Variability, Growth parameters, GCV, PCV, Path analysis

Location: Horticulture Farm, Bangladesh Agricultural University, Mymensingh

Start Date: 00-02-2002

End Date: 00-05-2002

Program Area: Variety and Species

Commodity: Okra

Objectives:

To determine the performance and variability of okra accessions for yield and to assess the interrelationships between yield and growth contributing characters.

Methodology:

The experiment was conducted at the Horticulture Farm, Bangladesh Agricultural University, Mymensingh during the period from February to May, 2002. The average maximum temperature during the period of experiment was 31.82⁰C and the average minimum temperature was 24.14⁰C. The soil texture was silty loam with pH value of 6.7. Fifty okra accessions were used in this study which was collected by the Conservation of Vegetables and Fruits in Bangladesh (CVFB) project from different parts of the country. These 50 accessions were considered as the treatments of the experiment and chosen primarily to represent the commercial types of okra grown in different parts of Bangladesh like Jamalpur (5), Mymensingh (7), Tangail (3), Pabna (7), Rajshahi (2), Natore (3), Gaibandha (1), Dinajpur (1), Panchaghar (1), Comilla (9), Chittagong (9) and Rangunia (2). The experiment was laid out in the Randomized Complete Block Design (RCBD) with three replications. One accession represented one treatment and seven plants in an accession represented one replication. The distance between replication to replication was 1m, plant to plant 45 cm and row to row 50 cm. The experimental plots were properly prepared and added recommended doses of manures and fertilizers (Anon., 1998). Other intercultural operations were done as and when necessary. Then green pods were harvested regularly when they attained edible stage. Harvesting started from 18 April 2002 and continued up to the last period. Data on the 5 selected growth contributing characters such as height of plant, number of primary branches per plant, spread of plant, number of nodes per plant and number of leaves per plant at 80 DAS (Days After Sowing) were recorded from the sample plants during the experiment. Data on the 5 selected leaf characteristics in respect of length, breadth, petiole length, shape and colour were also recorded time to time during the experiment. Finally, the yield of green pods was calculated properly. The data were analyzed using MSTAT-C and GENSTAT software to find out the significance of difference among the treatment means phenotypic co-efficient of variation (PCV) and genotypic co-efficient of variation (GCV). The significance of the difference between treatments means was evaluated by least significance difference (LSD) test for the interpretation of the results (Gomez and Gomez, 1984). Simple correlation co-efficient (r) among five important growth contributing characters of okra accessions was estimated regarding the formula followed by Singh and Chaudhury (1985). Path co-efficient analysis was done according to the procedure employed by Dewey and Lu (1959) using simple correlation values.

Source of Information: J Agric Rural Dev 6(1&2), 25-35, June 2008 ISSN 1810-1860

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The result of the present experiment revealed that a wide variability exists among the collected okra accessions. These variability could be used for future breeding programme of okra in our country. The highest genotypic and phenotypic co-efficient of variation was observed in primary branches per plant. Also there was association of different growth contributing characters with the yield of okra. In respect of yield of green pod the accession number 69 had the highest followed by accessions 65, 62, 57 and 13 which were positively correlated with the plant height, number of nodes per plant, length of leaf, breadth of leaf and length of petiole. Therefore, accession number 69 is strongly recommended to be selected for okra cultivation followed by 65, 62, 57 and 13 from the 50 accessions.

Knowledge Management: Journal