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Effect of Weeding Regime on Weed Vegetation and Yield Performance of Wheat in Two Locations of Mymensingh District

MG Kabir*
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202Mymensingh

M Begum
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202Mymensingh

MM Hossain
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202Mymensingh

MP Anwar
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202Mymensingh

Abstract/ Executive Summary:

On- farm two experiments were carried out at the Fulbaria upazila under Mymensingh district and Agronomy Field Laboratory, Department of Agronomy, Bangladesh Agricultural University (BAU), Mymensingh during the period from November 2011 to March 2012. The experiment comprised ten fields for each of the locations which composed of three weeding regime treatments, namely, unweeded, farmers’ weeded and weed free. The design was randomized complete block with ten replications. Data on weed density, yield contributing characters and yield of wheat were recorded. Except straw yield in Fulbaria all others yield contributing characters were affected significantly due to weeding regime treatment. The highest grain yield was recorded in weed- free treatment compared to farmers weeded and unweeded treatment in Fulbaria. Whereas, in Agronomy Field Laboratory at BAU, the highest grain yield was observed in weed-free treatment which was statistically identical to farmers’ weeded treatment. Five dominant weed species were ident ified in Fulbaria naimly Cynodon dactylon L. , Cyperus rotundus L. , Alternanthera sessilis L. , Polygonum orientale L. and Chenopodium album L. and in Agronomy Field Laboratory at BAU namely Gnaphalium affine L. , Cyperus rotundus L. , Digitaria sanguinalis L. , Cynodon dactylon L. and Panicum repens L. Infestation of Cynodon dactylon L. was more in Fulbaria due to control difficulties and Gnaphalium affine L. was more in BAU due to weed seed bank year after year and poor cultural management. So there is scope to increase yield potential of wheat by improving existing weed control practices.

Keywords: Productivity, Weed vegetation, Weeding regime, Wheat

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

Start Date: 00-11-2011

End Date: 00-03-2012

Program Area: Crop-Soil-Water Management

Commodity: Biological weed management

Objectives:

To find out the effect of weeding regime on weed vegetation and yield components and yield of wheat in two locations of Mymensingh district.

Methodology:

The on - farm and site specific study was conducted in Fulbaria Upazila and Agronomy Field Laboratory, Bangladesh Agricultural University (BAU), under Mymensingh district during the period from November 2011 to March 2012 to study the weed vegetation and productivityof wheat as affected by weeding regime. Geographically the experimental site of fulbaria is located at 24063' N latitude and 90⁰27'E longitude and BAU is located at 24⁰04 N latitude and 90⁰50' 50' E longitude and at an elevation of 18 m above the sea level. The site of both location falls under the Old Bramaputra Floodplain Agroecological Zone (AEZ- 9). Generally soil of this area belongs to the Sonatala series of non-calcareous dark grey floodplain with loamy soil. The area was medium high land with well-drained condition. when it was necessary (approximately 10 days interval)after broadcasting of wheat seeds. In unweeded treatment no weeding was done upto the harvest of the crop and in the farmers' weeded treatment farmers were allowed to control weeds in their conventional method. That means, the farmers were requested to perform the weeding operation when they do it in their fields. The superimposed position of plots in the farmers’ field has been shown. The experiment was laid out in a randomized complete block design with ten replications. The size of the unit plot was 4.0 m × 2.5 m having a plot to plot 0.5m distance for both locations. The numbers of unit plots became 30 for each location. The experimental plots were fertilized with urea, triple super phosphate, muriate of potash and gypsum at the rate of 220 -180- 50 - 120 kg ha ^-1 , respectively of both sites. Seeds were sown Fulbaria upazila and Agronomy Field Laboratory, BAU on 23 November and 24 November, 2011 respectively @ 120 kg ha^-1 . Weeding was done as per treatment. Intercultural operations were done in order to ensure and maintain the normal growth of the crop. Data on weed species were recorded from unweeded plot by using 0.25m × 0.25m quadrate. The quadrate was placed in four spots at random in each plot. In each p lot all weed species inside the quadrate were collected. The crop was harvested plot-wise at full maturity on 20 March 2012 in Fulbaria and on 21 March 2012 at Agronomy Field Laboratory, BAU from 1 m² area. Harvested crops were sun dried for four days. The n threshing, cleaning, drying and weighing of seeds were done and converted to t ha ^-1 . Five sample plants were selected at randomly and uprooted from each plot excluding boarder for collecting data on yield contributing characters of wheat. Data on yield and yield parameters were compiled, tabulated and analyzed statistically using the analysis of variance technique. Analysis of variance was done and the mean differences were adjudged by Duncan's Multiple Range Test (DMRT) (Gomez and Gomez, 1984) with the help of computer package program MSTAT- C.

Source of Information: Progressive Agriculture 25: 23 -30, 2014, ISSN: 1017-8139

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

This study reveals that, in Fulbaria upazila, farmers' weeding practices produced yield around 1% higher and 31.66% lower than unweeded and weed - free condition, respectively. This result indicates that farmers' weeding practices is not enough to produce optimum yield of wheat. On the other hand, at Agronomy Field Laboratory of BAU, although, existing weed management practice produced the significantly similar yield of weed - free condition but overall yield was very low compared to Fulbaria upazila. This result indicates that there is a scope to increase yield potentiality by improving other management practices along with weed control measures at Agronomy Field Laboratory of BAU.

Knowledge Management: Journal