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Growth Analysis of Mungbean (vigna Radiata (l.) Wilczek) Under Variable Population Densities at Different Dates of Sowing

M. MOTIOR RAHMAN
Bangladesh Agricultural Research Institute, Joydebpur, Gazipur-1701, Bangladesh.

A. AHAD MIAH
Bangladesh Agricultural Research Institute, Joydebpur, Gazipur-1701, Bangladesh.

A. F. M. MANIRUZZAMAN
Bangladesh Agricultural Research Institute, Joydebpur, Gazipur-1701, Bangladesh.

A. K. M. M. RAHMAN
Bangladesh Agricultural Research Institute, Joydebpur, Gazipur-1701, Bangladesh.

K. KHAN
Bangladesh Agricultural Research Institute, Joydebpur, Gazipur-1701, Bangladesh.

Abstract/ Executive Summary:

In a field experiment a newly released variety of mungbean (Kanti) grown under varying population densities at different dates of sowing was evaluated for yield performance in relation to various growth parameters. The treatments consisted of four dates of sowing viz. August 19, September 3, September 18 and October 3 with three population densities i.e. 25 xI0⁴, 33 x I 0⁴and 50 x 10⁴ plants/ha. August sown crop with maximum population density gave the highest yield ( 1142 kg/ha). There is scope to increase the grain yield of mungbean for September sown crop with higher population density. Although the crop growth rate (CGR ) and total dry matter per plant was higher with lowest population density, but the leaf area index (LAI) was higher with the highest population density in case of August sown crop. Total dry matter per unit area and leaf area indices showed a strong positive significant correlation with grain yield, while crop growth rate showed inverse relationship irrespective of spacing and dates of sowing. Relative growth rate (RGR) and net assimilation rates were maximum at 20 and 40 days after emergence of the crop in all the treatments.

Keywords: Growth, Population density, Mungbean

Location: Central Research Station, BARI, Joydebpur, Gazipur

Start Date: 00-08-1989

End Date: 00-12-1989

Program Area: Crop-Soil-Water Management

Commodity: Mungbean

Objectives:

To evaluate the physiological basis of yield variations in mungbean with a view to finding out the optimum time of sowing and proper population density required to achieve higher yields.

Methodology:

The experiment was conducted with a newly released variety of mungbean (Kanti) at the Central Research Station, BARI, Joydebpur, during August-December, 1989. Kanti is a short duration, higher yielding (30-35% higher than local cultivars) variety of mungbean having tolerance to yellow mosaic virus disease. The experimental soil is a clay loam with pH 6.3. The experiment was laid out in a split plot design with four replications. The treatments consisted of four dates of sowing viz : (i) August 19, (ii) September 3, (iii) September 19 and (iv) October 3 and three spacing i.e. 40 cm x 10 cm , 30 cm x 10 cm and 20 cm x 10 cm corresponding to 25 x l 04 , 33 x l 04 and 50 x 1 04 plants/ha. Dates of sowing and spacing treatments were assigned in the main and sub-plots, respectively . The main plot size was 20 m x 4 m and the sub-plots comprised of 6 m x 4 m. Fertilizers at the rate of 20- 40-30-20 kg/ha of N, P₂ 0₅ , K₂O and S were applied as basal dose. Starting from ten days after emergence of the crop 20 randomly selected plants from each plot were taken at regular ten days interval until maturity for the determination of various growth parameters. Different growth estimates such as LAI, CGR, RGR and NAR were calculated following the formulae by Radford (1967) and Watson (1947). Data on yield attributes were recorded from 20 randomly selected plants from each plot.Yield estimation was done by harvesting an area of 12 m² from the centre of each plot and converted into tons per hectare.

Source of Information: Bangladesh J. Bot. 24(1): 53- 59. 1995 (June); ISSN 0253-5416

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

August sown crop with maximum population density gave the highest yield ( 1142 kg/ha). There is scope to increase the grain yield of mungbean for September sown crop with higher population density. Although the crop growth rate (CGR ) and total dry matter per plant was higher with lowest population density, but the leaf area index (LAI) was higher with the highest population density in case of August sown crop. Total dry matter per unit area and leaf area indices showed a strong positive significant correlation with grain yield, while crop growth rate showed inverse relationship irrespective of spacing and dates of sowing. Relative growth rate (RGR) and net assimilation rates were maximum at 20 and 40 days after emergence of the crop in all the treatments.

Knowledge Management: Journal