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Effect of Irrigation on the Morpho-physiological Attributes of Mungbean (vigna Radiata L.)

S. Parvin
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. A. Samad
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. S. U. Bhuiya
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

The experiment was conducted to assess the effect of irrigation on the morpho-physiological attributes of mungbean, Vigna radiata L. cv. BINA mung-5 in Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during October 2009 to February 2010. The trial comprised seven (7) treatments of irrigation. All the morphological attributes showed the best performance under T7 where three irrigations applied and the lowest performance showed under T1, no irrigation condition. Similar results were observed in case of physiological attributes like crop growth rate, relative growth rate, net assimilation rate, leaf area ratio and leaf area index. The highest values of assimilate partitioning like pod dry matter plant-1 and total dry matter plant-1 were found from T7 where three irrigation applied and the lowest from no irrigation. These attributes strongly influenced the grain yield of mungbean.

Keywords: Irrigation, Mungbean, Growth attributes, Growth stage.

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, Bangladesh

Start Date: 00-10-2009

End Date: 00-02-2010

Program Area: Crop-Soil-Water Management

Commodity: Mungbean

Objectives:

To assess the effect of irrigation on the morpho-physiological attributes of mungbean and to find out optimum stages of irrigation for increased growth of mungbean (cv. BINA mung 5) resulting maximum yield.

Methodology:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during October 2009 to February 2010. The land was medium high, well drained silty-loam its general fertility level was low with pH 6.82 and low in organic matter content (1.19%). The selected variety of mungbean in this experiment was BINA mung- 5. There were seven treatments namely, T₁ = No irrigation (Io), T₂ = One irrigation (E-F), T₃ = One irrigation (F-P), T₄ = One irrigation (P-M), T₅= Two irrigation (E – F & P), T₆ = Two irrigation (F-P & M), T₇ = Three irrigation (E-F, P & M). The experiment was laid out in a randomized complete block design (RCBD) with four replications. Total numbers of unit plots were 28 of plot size 4.0m × 2.5m. The treatments were randomly allocated. Each unit plot was uniformly fertilized at the time of land preparation with urea, triple superphosphate (TSP), muriate of potash (MOP), gypsum, zinc sulphate and molybdenum @ 40, 100, 60, 60, 4 and 1 kg ha^-1, respectively (BINA, 2008). The seeds were sown on 15 October 2009 in rows at 2-3 cm soil depth and row to row distance was 30 cm. Seeds were sown @ 25 kg ha^-1. Weeding and thinning were done at 20 and 40 days after sowing (DAS). To study ontogenic growth characteristics a total of five harvest was made and at final harvest, data were collected on some morpho-physiological and yield attributes and yield. The first crop sampling was done at 30 DAS and continued at an interval of 15 days up to 90 DAS. From each plot, five plants were randomly selected and uprooted for obtaining data on necessary parameters. The plants were separated into roots, stem and leaves and the corresponding dry weights were recorded after oven dry at 80 ± 2ºC for 72 hours. The leaf area of each sample was measured by LICOR automatic leaf area meter (model: LI 3000, USA). Leaf area index and the growth analyses like absolute growth rate, relative growth rate and net assimilation rate were carried out. Plant height was taken to the length between the base of the plant and the tip of the main stem and was expressed in cm. Number of branch and leaves plant^-1 were counted separately from selected plants and then the average number of them were computed. The total dry matter was calculated from the summation of dry weight of leaf, stem, root and pod per plant. The recorded data on various plant characters were statistically analyzed through analysis of variance (ANOVA). The difference among treatment means were compared by Duncan's Multiple Range Test with the help of a computer based statistical package programme MSTAT-C.

Source of Information: Bangladesh J. Seed Sci. & Tech. 14 (1 &2): 281-287 (2010); ISSN 1029 - 8800

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It was found that three irrigations about produce 50 % more biomass than no irrigated plots. The result showed that dry matter accumulation increased with the increase of irrigation frequency. This indicated that irrigation had direct effect on TDM. DM production of mungbean decreased with increasing soil moisture deficits. It is reported that maximum total biomass increased significantly with the number of stages irrigated, with irrigation during the vegetative stages having the highest positive effect and found that irrigation regimes significantly increased the total dry matter production.

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