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Correlation and Path Coefficient Analysis in Onion (allium Cepa L.)

M. A. Rahman
Horticulture Research Centre, Bangladesh Agricultural Research Institute,

S. R. Saha
Horticulture Research Centre, Bangladesh Agricultural Research Institute,

M. A. Salam
Horticulture Research Centre, Bangladesh Agricultural Research Institute,

A. S. M. H. Masem
Genetics and Plant Breeding Division, Bangladesh Agricultural Research Institute

S. S. Chowdhury
Horticulture Research Centre, Bangladesh Agricultural Research Institute,

Abstract/ Executive Summary:

Correlation and path coefficient analysis in onion showed that total bulb yield (kg ha ^-1) had significant positive correlation with plant height, leaf number per plant, bulb diameter and bulb yield per plant but had significant negative association with plant spacing. Path analysis indicated that bulb diameter, plant height and leaf number per plant were the principal components of yield.

Keywords: Onion, Correlation and path coefficient

Location: Gazipur

Start Date: 23-10-1997

End Date: 12-04-1998

Program Area: Variety and Species

Commodity: Onion

Objectives:

To assess the nature of association of yield contributing characters among themselves and also the direct and indirect effects of yield contributing characters on yield through path analysis.

Methodology:

The experiment was conducted at the experimental field of Horticulture Research Centre, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, during the period from October , 1997 to April, 1998. The seeds of onion line On-043 were sown in 4 different times with 15 days interval to obtain seedlings of 30 days old at each transplanting date, as the planting dates were at 15 days of interval. The land was ploughed to a desirable tilth. The field was fertilized with cow dung, urea, TSP and MP@ 5 t, 260, 136 and 162 kg ha^-1 respectively . The entire quantity of cow dung and TSP were applied during final land preparation. Urea and MP were applied in two equal installments at 30 and 60 days after transplanting . The experiment was laid out in a split plot design. The 12 different treatment combinations were replicated 3 times with spacing in the main plot and time of planting in the sub-plots. The 3 different plant spacing were 5, 10 and 15 cm respectively and the 4 different time of plantings were 01 and 16 December, 01 and 16 January respectively. Row to row spacing were kept constant of 20 cm. The unit plot size was 3 x 2 m². Data on plant height, leaf number per plant, bulb diameter, bulb yield per plant and bulb yield per plant were recorded from 10 randomly selected plants from each unit plot. Simple correlation coefficients were estimated and path coefficient analysis was done

Source of Information: Online Journal of Biological Sciences 2 (8): 531-532 , 2002

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The performance of the variety under different environmental conditions of growth was observed that the variety showed variation in average performance for all the characters studied. The highest plant height (49 .64cm) was recorded from 16 December planting with 10 cm spacing and the lowest (32.40 cm) from 16 January planting with 10 cm spacing. The maximum number or leaves per plant (8.60) was obtained from 1 December planting with 15 cm spacing and the lowest (4. 1 0) from 1 6 January planting with 10 cm spacing. The highest diameter of bulb (3.80cm) was found in 01 December planting with 10 cm spacing and the lowest (2.15) in 16 January with 5c m spacing. December, 16 with 5 cm spacing produced the maximum bulb yield per hectare (9630 kg) while 16 January planting with 15 cm spacing produced the lowest (1330 kg). The correlation coefficients between all possible combinations of 6 characters. Among the 15 associations, 13 were found significant. Total bulb yield showed significantly positive association with plan t height, leaf number per plant, bulb diameter and bulb yield per plant and negative association with spacing. Spacing had significant positive correlation with plant height and bulb yield per plant; but it did not show any association with leaf number per plant and bulb diameter. Plant height exhibited strong positive correlation with leaf number per plant, bulb diameter and bulb yield per plant among themselves. The strong correlation among these characters indicated that these characters were governed by the same genetic system that is the characters were expected to be linked to each other. Thus selecting plants for better plant type and other characters may lead to an improvement of yield in onion. Significant positive correlation's of onion yield were reported with plant height and bulb yield per plant. Path analysis revealed that bulb yield per plant had very high negative direct effect (-5.54091 on total bulb yield, though its correlation with yield was positive and highly significant. This might be due to high positive indirect effects via bulb diameter (3.8074), spacing (1.417S), plant height (0.S0571 and leaf number per plant (0.4300). The negative direct effect indicated that variety with low bulb weight could be developed without sacrificing total bulb yield. Bulb diameter had the highest positive direct effect (4.2276) in building up the correlation with total bulb yield (0.5993). Its negative indirect effect via bulb yield per plant (-4.990 1) counter balanced the high positive direct effect to some extent. Spacing, plant height and leaf number per plant also showed high positive direct effects. The direct effect of leaf number per plant (0.56311 was more or less similar to its total correlation coefficient (0.5800), which indicated that the variability

Knowledge Management: Journal