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Contribution of Flower Removal on the Performance of Mungbean

Rajesh Chakraborty
Department of Agronomy, Sher-e- Bangla Agricultural University, Dhaka, Bangladesh.

Tanvir E. Chowdhury
Institute of Seed Technology, Sher-e- Bangla Agricultural University, Dhaka, Bangladesh.

Md. Jafrul I. Sumon
Department of Agronomy, Sher-e- Bangla Agricultural University, Dhaka, Bangladesh.

Maruf Mostofa
Institute of Seed Technology, Sher-e- Bangla Agricultural University, Dhaka, Bangladesh.

Mohammed L. Rahman
Farm Superintendent
Sher-e -Bangla Agricultural University, Dhaka, Bangladesh.

Abstract/ Executive Summary:

The farmers of Bangladesh cannot get the higher economic yield from Mungbean due to the tendency of shattering of immature flowers and dropping of flowers and pods from plant by pest damage. From this point of view a field experiment were conducted in Sher-e-Bangla Agricultural University; Dhaka, Bangladesh, to investigate the response of flower removal on the performance of Mungbean (BARI Mung 5 ) during kharif-1season in 2014. There were seven levels of flower removal treatment in this experiment viz., 0, 5, 10, 15, 20, 25, 30 DAFI (Days after Flower Initiation). All the treatments were allocated as RCBD with 3 replications. Results revealed that, with the increasing trend of deflowering activity, there was an increasing trend in the branch, leaf and dry matter production. But there was a negative response on seed yield with in creasing removal trend. Reduced number of pod plant^-1, number of seed pod^-1, pod and seed sizes responded with the lower yield. Due to decreased flowering duration, the total flower production was reduced and resulted in poor pod and seed yields, although the racemes were enhanced fol lowing flower removal. Deflowering for 10 consecutive days has no significant response on TDM (Total Dry Matter) and seed yield plant^-1 besides, resulted in about 80% of total flower abortion. But beyond this period (flower removal > 10 days) seed yield was significantly reduced. In respect of sink loss the contribution of high yielding Mungbean was lesser. From the economic point of view the findings from this experiment was also studied in case of pest and disease and also revealed that, flower removal at 10 DAFI was best for performances without imparting significant seed yield loss.

Keywords: Mungbean, Flower removal, Growth, Seed yield

Location: Sher-e-Bangla Agricultural University; Dhaka, Bangladesh

Start Date: 00-00-2014

End Date: 00-00-2014

Program Area: Pest Management

Commodity: Mungbean

Objectives:

To investigate on the intensity and level of flower removal in Mungbean affecting growth, reproductive characters and seed yield under field condition

Methodology:

Experiments were conducted at the Agronomy field (23º74^/N latitude and 90º35^/E longitude) with an elevation of 8.2 meter from sea level under Madhupur Tract (AEZ 28) at the Sher-e-Bangla Agricultural University; Dhaka, Bangladesh in Kharif-I (March-May) season, 2014. One high yielding Mungbean variety (BARI MUNG 5 ) and seven flower removal treatments were used. Seeds were sown in rows, 1.2 m long with 30 cm apart between rows. Sowing was done on 1 March. The experimental design was simple RCBD (Randomized Complete Block Design) with three replications. Seeds were sown continuously in line and two weeks after germination, the plants were thinned and maintained to a uniform density of 30 plants m^-2. Cultural practices were the same in all the plots. Urea, triple super phosphate(TSP), Muriate of potash (MOP), Zinc sulphate and, Boric acid were used as a source of nitrogen, phosphorus, potassium, zinc and boron at the rate o f 50, 80, 35,5 and 5 kg ha^-1, respectively (Source: BARI Krishi Projoukti Hatboi) at the time of final land preparation. First weeding was done followed by thinning at about 21 days after sowing (DAS). One irrigation was give n at 27 DAS in this season. Insecticide (Ripcord 20 EC @ 0.025%) was sprayed at flowering and fruiting stage (52 DAS) to control shoot and fruit borer. Marshal @3% was used for controlling the Mungbean yellow mosaic virus. The seven levels of flower removal treatments were employed at the beginning of first opened flower ( at 45 DAS) were: (i) control (No flower removal), beginning from first day of flowering, all opened flowers were removed continuously for (ii) 5; (iii) 10; (iv) 15; (v) 20; (vi) 25; and (vii) 30 days. A 1m central section of each plot was harvested to avoid border effects. The harvested plants of each plot were separately bundled and tagged. After recording some necessary data, the harvested plants were threshed by hand and oven dry weight (80°C ± 2 for 48 hours) of grain and other plant parts was recorded per plot wise. Specific leaf weight (SLW) was determined four times at 5 days interval from the beginning of flowering to pod maturity in this season. Finally, at harvest, total reproductive unit (TRU), actual seed yield plant^-1, yield components and dry matter production were recorded. The TRU plant^-1 was determined by the number of inflorescence plant^-1 multiplied by the number of nodes inflorescence^-1. The collected data were subjected to statistical analysis (MStatC) as per the design used and different means were tested by LSD (Least Significant Difference) test methods.

Source of Information: European Journal of Experimental Biology, 2015, 5(3):66-71, ISSN: 2248 –9215

Article Link (Online Journal): www.pelagiaresearchlibrary.com

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The phenology, vegetative, reproductive and yield performances of Mungbean were significantly influenced by flower removal.

From the economic point of view, flower removal at 10 DAFI was observed best for performances without imparting significant seed yield loss.

Knowledge Management: Journal