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Effect of Time of Weeding on the Yield and Yield Attribues of Mungbean

B.L. Nag
Scientific Officer (Agronomy), RARS, Rahmatpur, Barisal.

T.K. Paul
Senior Scientific Officer (Horticulture), RARS, Rahmatpur, Barisal.

, K.M. Meraz
Scientific Officer (Soil Science), RARS, Rahmatpur, Barisal.

S. Raflquzzaman
Scientific Officer (OFRD), RARS, Rahmatpur, Barisal.

Abstract/ Executive Summary:

A field experiment was conducted during rabi seasons of 1994 and 1995 at the Regional Agricultural Research Station, Rahmatpur, Barisal to evaluate the critical period of crop-weed competition in mung bean. Weeding at twenty-one days after emergence (DAE) was the most critical period of weed removal in mung bean. During 1994 and 1995, the highest grain yield (1013.75 and 985.50 kg/ha, respectively) were obtained when the plots were weeded at 21 DAE. Delay in weeding decreased seed yield and yield attributes. Unrestricted growth of weed reduced munbgean seed yield by about 36%. On an average, Kanti gave the highest gross return (Tk. 28,451.50/ ha), net return (Tk. 19,980.50lha) and benefit cost ratio (3.36) when plants were weeded at 21 DAE. Cynodon dactylon (39.73%) was the most dominant weed.

Keywords: Effect, Weeding, Yield, Mugbean

Location: RARS, Rahmatpur

Start Date: 00-00-1994

End Date: 00-00-1995

Program Area: Crop-Soil-Water Management

Commodity: Mungbean

Objectives:

To find out the critical period of weeding for different varieties/genotypes of mungbean.

Methodology:

A field experiment was conducted at the Regional Agricultural Research Station, Rahmatpur, Barisal during 1994 and 1995 to identify the critical period of weeding in rabi mungbean Kanti, NM-92 and Barisallocal were used as the test materials. The experiment was laid out in a randomized complete block design with three replications with a spacing of 30 em between rows and 10 em within rows. Unit plot size was 4 m x 3 m. Seven weeding treatments such as no weeding, weeding at 7,14,21,28, 35 and 42 days after emergence (DAE) were used. The experimental plots were prepared with 20-40-20, N2, P₂0₅and K₂0 kg/ha in the form of Urea, Triple Super Phosphate (TSP) and Muriate of Potash (MP). The entire amount of fertilizers were applied as basal dose. Weeding was done according to treatments i.e at 7, 14, 21, 28, 35 and 42 DAE. Weeds in the control plots were allowed to grow undisturbed till crop maturity. Data on plant height, number of pods/ plant, pod length, seeds/pod and 1000 grain wt. were recorded from 10 randomly selected plants per plot. For seed yield, an area of 3 m² (3m x 1 m) was harvested form the centre of each plot. Matured pods were harvested twice from each plot. Weed population at harvest were recorded from 0.5m² by using an quadrat and weeds found in the plots were identified. Data on weed bio-mass was also taken at harvest. Total man hours required for different weeding operations were recorded. Cost and benefit analysis was done for each treatment per hectare basis taking into account of market values of mungbean. Analysis of variance (ANOVA) were performed on yield and yield attributes of mungbean. The means were separated and compared by LSD.

Source of Information: Bangladesh 1. Nuclear Agric. 12: 53-60, 1996

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Weeding at twenty-one days after emergence (DAE) was the most critical period of weed removal in mungbean. During 1994 and 1995, the highest grain yield (1013.75 and 985.50 kg/ha, respectively) were obtained when the plots were weeded at 21 DAE. Delay in weeding decreased seed yield and yield attributes. Unrestricted growth of weed reduced munbgean seed yield by about 36%. On an average, Kanti gave the highest gross return (Tk. 28,451.50/ ha), net return (Tk. 19,980.50/ha) and benefit cost ratio (3.36) when plants were weeded at 21 DAE. Cynodon dactylon (39.73%) was the most dominant weed.

Knowledge Management: Journal