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Nitrogen Level and Physiological Basis of Yield of Mungbean at Varying Plant Population in High Ganges River Flood Plain Soil of Bangladesh

M.A.K. Mian
Regional Agricultural Research Station, Ishurdi 6620, Pabna, Bangladesh

J. Hossain
Regional Agricultural Research Station, Ishurdi 6620, Pabna, Bangladesh

Abstract/ Executive Summary:

A field experiment was conducted at the Regional Agricultural Research Station of Bangladesh Agricultural Research Institute, Jessore during early kharif season of 2009 and 2010 to observe the effect of nitrogen on the physiological basis of yield of mungbean at varying plant population. In the experiment, four nitrogen levels (N₀, N₄₀, N₆₀ and N₈₀ kg ha^-1) were assigned in the main plots and three plant population (P₃₀, P₃₅ and P₄₀m^-2) in the sub plots. The results revealed that mungbean showed better growth in N₆₀ and N₈₀ kg ha^-1 representing higher values of CGR, TDM, LAI and plant height while N₄₀ exhibited intermediate growth. Again, growth of mungbean was better in higher plant population (35-40 m^-2) representing higher values of growth parameters. Seed yield of mungbean was obtained the highest (1908 kg ha^-1) associated with the highest No. of pods plant^-1 (29.98), seeds pod^-1 (10.41) and 1000-seed weight (37.70 g) in N₄₀ kg ha^-1. Further, seed yield of mungbean was the highest (1919 kg ha^-1) in plant population of 40 m^-2. In interaction, seed yield was the highest (1963 kg ha^-1) in N₄₀kg ha^-1 with plant population of 40 m^-2. The effect of applied nitrogen on the seed yield of mungbean can be explained 78% (R² = 0.78) by this function (Y = 1540.70+16.069x-0.173x²). The optimum nitrogen level was 46 kg ha^-1 by using the developed functional model and then the predicted seed yield of mungbean would be 1944 kg ha^-1.

Keywords: Growth, Yield, Nitrogen, Population, Mungbean, Fuctional model

Location: Regional Agricultural Research Station of Bangladesh Agricultural Research Institute, Jessore

Start Date: 00-00-2009

End Date: 00-00-2010

Program Area: Crop-Soil-Water Management

Commodity: Mungbean

Objectives:

The study was undertaken to estimate the optimum level of nitrogen and understanding of physiological basis of yield of mungbean at varying plant population.

Methodology:

Materials: An experiment was conducted at Regional Agricultural Research Station of Bangladesh Agricultural Research Institute, Jessore during early kharif season of 2009 and 2010. The experimental site belongs to High Ganges River Flood Plain Soil (Agro-Ecological Zone-11) of Bangladesh. The texture of the soil was sandy loam with medium to low nutrient status (organic matter 1.28%, total N 0.098%, available P 14.80 ppm, exchangeable K 0.15 me 100 g^-1 soil, available S 20 ppm and available Zn 1.08 ppm. Four nitrogen levels viz., N₀, N₄₀, N₆₀ and N₈₀ kg ha^-1 were assigned in the main plots and three plant population viz., P₃₀, P₃₅ and P₄₀m^-2 in the sub plots. BARI Mungbean-6 was sown on 3 March 2009 and 2010. Methods: The experiment was laid out in a split plot design with 3 replications. The unit plot size was 3x2.4 m. Nutrients, 25-25 kg ha^-1 of P and K were applied as basal. Two irrigations were done at 28-30 March and 14-16 April of 2009 and 2010. Two weeding was done at 12 and 24 DAE for the crop. Ten plants were sampled randomly at 10 days intervals after emergence for assessing growth parameters like plant height, leaf area, CGR and Total Dry Matter (TDM) of mungbean. Plant samples were taken excluding the harvesting area for measuring yield and yield components. Pod harvesting was started from 8-10 May of 2009 and 2010. Yield components and yield were also recorded at the maturity of crop and analyzed statistically. Optimum level of nitrogen was estimated using the flowing polynomial function generally stated as bellow: Y = a + bx - cx^2,Where: Y = Yield of mungbean (dependent variable), a = Intercept (constant), b and c are the regression coefficients, x = Applied nitrogen level (independent variable). From the function, optimum level of nitrogen for mungbean can be determined as follows. Optimum level of nitrogen for maximum yield of mungbean: ( N₀) = -b/2c. Yield was also predicted against the optimum nitrogen level through developed functional model.

Source of Information: Pakistan Journal of Biological Sciences, 17: 925-930; ISSN 1028 8880

Article Link (Online Journal): DOI: 10.3923/pjbs.2014.925.930; URL: http://scialert.net/abstract/?doi=pjbs.2014.925.930

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Nitrogen 40 kg ha^-1 with plant population of 40 m^-2 were suitable for higher yield of mungbean at Jessore region in High Ganges River Flood Plain soil of Bangladesh. The optimum nitrogen level would be 46 kg ha^-1 by using the developed functional model and then the predicted seed yield of mungbean would be 1944 kg ha^-1.

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