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Growth Attributes of Rapeseed Varieties (brassica Campestris L.) in Relation to Sowing Dates and Weedings Treatments

Mst. Towhida Akhter
Institute of Biological Sciences, University of Rajshahi, Rajshahi-6205, Bangladesh

P B Kundu
Department of Botany, University of Rajshahi, Rajshahi-6205, Bangladesh

N K Paul
Department of Botany, University of Rajshahi, Rajshahi-6205, Bangladesh

Abstract/ Executive Summary:

Context: To analyze the effect of sowing dates and weeding treatments on growth attributes such as total dry matter (TDM), leaf area index (LAI), net assimilation rate (NAR), crop growth rate (CGR), leaf area ratio (LAR) of three rapeseed (Brassica campestris L.). Objectives: The objective of the study was to identify the growth in relation to sowing dates and weed competition and identify the weeding number for better growth of rapeseed. Materials and Methods: This investigation was arranged as factorial experiment based on the split-split plot design with three replications. Four sowing dates were including 18 October (S₁), 12 November (S₂), 17 November (S₃) and 3 December (S₄) and three weeding treatments were no weeding (WO), one hand weeding (W₁) and two hand weeding (W₂) and three varieties viz., BINA Sarisha-5, BINA Sarisha-6 and BARI Sarisha-14 were investigated. Results: The results showed that, TDM, LAI, CGR, NAR and LAR were affected by sowing date and weeding treatments. The highest TDM, LAI and CGR were obtained in the first sowing and two weedings treatment. The highest NAR was found in S₂ plants and W₀ treatment. The highest LAR was found in S₂ plants and W1 treatment. Conclusion: The results obtained in this study suggest that the first sowing and two weeding treatments are superior for the production of rapeseed.

Keywords: Rapeseed, Sowing date, Weeding, Growth attributes.

Location: Experimental field of Rajshahi University Campus

Start Date: 00-10-2006

End Date: 00-03-2009

Program Area: Crop-Soil-Water Management

Commodity: Mustard

Objectives:

The objective of the study was to identify the growth in relation to sowing dates and weed competition and identify the weeding number for better growth of rapeseed.

Methodology:

Experimental field: The experiment was carried out at the experimental field of Rajshahi University Campus (Agro-Ecological Zone 11), Bangladesh (2475 N latitude and 9050 E longitude) during the period from October 2006 to March 2007 and October 2008 to March 2009 growing seasons. The soil type was silty loam, having pH 7.5 as well as 35% of field capacity. Treatment: The experiment was laid out in a split-split plot design with three replications. Each replicated field was divided into four main plots for sowing treatments (S1 = 18 October, S2 = 2 November, S3 = 17 November, S4 = 3 December). Each main plot was divided into three sub-plots for weeding treatment (W0 = no weeding, W1 = one hand weeding, W2 = two hand weedings). Each sub-plot was lastly divided into four sub-sub plots for three varieties (namely BINA Sarisha-5, BINA Sarisha-6 and BARI Sarisha-14 ) of rapeseed. Each plot size was 4 m 3 m, i.e., 12 m² having a plot to plot distance 1m to the North-South, 2 m to the East-West; replication to replication distance was 2 m, row to row 30 cm, and plant to plant 10 cm approximately. Border rows were not considered because of the border effect. Data analysis: At harvest, the three middle rows were used for sampling. For growth analysis, ten plants from the middle of each plot were harvested at 7 days intervals and the first harvest was taken at 20 days after sowing (DAS).The following traits were studied; TDM, LAI, CGR, NAR and LAR. Analysis of variance was performed with a personal computer using the IRRISTAT software. A factorial analysis of variance (ANOVA) was performed for all the parameters. Statistical analysis was carried out according to Gomez and Gomez (1984).

Source of Information: J. bio-sci. 21: 51-59, 2013 ISSN 1023-8654

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

TDM, LAI, CGR decreased with late sowing. The first sowing plants had higher values of the above characters. There was no clear pattern of LAR. The highest and lowest TDM, LAI and CGR were found in the W₂ and W₀ treatments, respectively. W₁ treatment had the highest NAR and LAR and the lowest were found in W0 treatment.

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