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Weeding and Plant Spacing Effects on the Growth and Yield of Blackgram

M. Asaduzzaman
Department of Agronomy, Sher-e-Bangla Agricultural Univerisity, Dhaka-120, Bangladesh

S. M. Masum
Department of Agronomy, Sher-e-Bangla Agricultural Univerisity, Dhaka-120, Bangladesh

T. S. Roy
Department of Agronomy, Sher-e-Bangla Agricultural Univerisity, Dhaka-120, Bangladesh

S. Sultana
Department of Agriculture, CODA, Dhanmondi, Dhaka, Bangladesh

Abstract/ Executive Summary:

An experiment was carried out at the Research Field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during March to June 2009 to evaluate the impact of weeding and plant spacing on the growth and yield performance of blackgram, The experiment was comprised of three levels of weeding viz. W₀ =No weeding, W₁ = One weeding at 25 DAS(days after sowing) and W₂ = two weeding at 25 and 40 DAS with four levels of spacing viz. D₁ = 30 cm x 7 cm, D₂ = 30 cm x 10 cm, D₃ = 30 cm x 13 cm and D₄ = 30 cm x 16 cm. The experiment was laid out Randomized Complete Block Design with three replications. The differential weeding and plant spacing did not show remarkable differences in dry matter production at early stages of crop growth. Two weeding significantly increased the number of pods plnat^-1, number of seeds pod^-1, seed weight and seed yield. Two weeding contributed 56.18% and 25.23% higher seed yield compared to no weeding and single weeding, respectively. The spacing 30 X 10 cm showed its advantages by producing 7.96-16.19% higher yield compared to other spacing. Two weeding and 30 X10 cm spacing performed the best giving the highest seed yield of 1.58 t ha^-1. Although the highest plant spacing performed better in yield contributing traits, comparatively higher number of plants in unit area, better portioning of assimilates towards grain contributed greatly to achieve better seed yield in plant spacing 30 X 10 cm.

Keywords: Weeding, Spacing, Growth and Yield

Location: Research Field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh

Start Date: 00-03-2009

End Date: 00-06-2009

Program Area: Crop-Soil-Water Management

Commodity: Black gram

Objectives:

1. The experiment was conducted to find out the effect weeding intensity and plant density on growth and yield of blackgram.

Methodology:

The experiment was carried out at the experimental field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from 31 March, 2009 to 9 June 2009.The experimental belongs to the Madhupur Tract (AEZ) having shallow red brown terrace soil. The experiment consist of two levels of weeding viz. W₁ = one weeding and W₂ = two weeding at 25 and 40 days after sowing (DAS) along with no weeding =W₀ (control) and four levels of spacing viz. D₁= 30 cm x 7 cm, D₂ = 30 cm x 10, D₃= 30 cm x 13 cm and D₄= 30 cm x 16 therefore twelve treatment combination were W₀D₁, W₀D₂, W₀D₃, W₀D₄, W₁D₁, W₁D₂, W₁D₃, W₁D₄, W₂D₁, W₂D₂, W₃D₃ and W₃D₄. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications and the of the experimental units were 4 X 3 m. BARI mash-1 was used as an experimental material were sown on March, 2009. They seeds were placed in furrows having a depth of 2-3 cm from solid surface. Row to row distance was maintained 30 cm and plant to plant distances as per treatments. Urea: TSP: MP @ 45: 80: 35 were applied during the final land preparation as sources of nitrogen, phosphorus and potassium. Weeding and thinning were down as per treatments. Pre irrigation was done to maintain the optimum moisture conditions in the field for equal seed germination and after sowing two irrigation were done at 15 DAS and 30 DAS for stand establishment. Harvesting was done when 90% of the pods became brown to black in color. The harvested pods were collected by hand picking from a pre demarcated area of 3 m² at the centre of each plot. The first crop sampling was done at 30 DAS to obtain plant dry weight and continued at an interval of 15 days. The growth and yield parameters data were recorded from ten selected plants in each plot. The components were oven dried at 70⁰C for 72 hours to record constant dry weights. Total dry matter was determined by the summing dry weight of each plant. The different parameters were statistically analyzed by MSTAT computer package program. The mean difference were compared DMRT (Duncan’s New Multiple Range Test) at 5% level of significance.

Source of Information: BANGLADESH RESEARCH PUBLICATIONS JOURNAL; ISSN: 1998-2003, Volume: 4, Issue: 1, Page: 62-68, May-June, 2010

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The differential weeding and plant spacing did not show remarkable differences in dry matter production at early stages of crop growth. Two weeding significantly increased the number of pods plnat^-1, number of seeds pod^-1, seed weight and seed yield. Two weeding contributed 56.18% and 25.23% higher seed yield compared to no weeding and single weeding, respectively. The spacing 30 X 10 cm showed its advantages by producing 7.96-16.19% higher yield compared to other spacing. Two weeding and 30 X10 cm spacing performed the best giving the highest seed yield of 1.58 t ha^-1. Although the highest plant spacing performed better in yield contributing traits, comparatively higher number of plants in unit area, better portioning of assimilates towards grain contributed greatly to achieve better seed yield in plant spacing 30 X 10 cm.

Knowledge Management: Journal