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Effect of Herbicides on Different Crop Characters Used in Controlling Weeds of Aman Rice Grown Under Wet Seeded Culture

M.K. Begum
Deparment of Agronomy, BAU, Mymensingh - 2202, Bangladesh

K.M. Hasan
Deparment of Agronomy, BAU, Mymensingh - 2202, Bangladesh

M. Salim
Deparment of Agronomy, BAU, Mymensingh - 2202, Bangladesh

M.A. Hossain
Deparment of Agronomy, BAU, Mymensingh - 2202, Bangladesh

M.K. Rahman
Deparment of Agronomy, BAU, Mymensingh - 2202, Bangladesh

Abstract/ Executive Summary:

Yield and yield contributing attributes of BR11 rice were influenced by different doses of the herbicides used. The highest grain yield (5.14 t ha^-1), thousand grain weight, straw yield were obtained by the treatment Golteer 5G at 24.70 kg ha^-1. The tallest plant and second highest grains/panicle were produced in Settoff 20WG at 50 g ha^-1. Number of grains/panicle was found to be maximum in plots treated with Ronstar 25EC at 1.0 l ha^-1. The smallest plant, lowest number of effective tillers plant^-1, non effective tillers plant^-1, grains panicle^-1, thousand grains weight, grain yield and straw yield were found in control. Golteer 5G at 12.35 kg ha^-1 produced the highest number of non effective tillers plant^-1. The results also demonstrated significant difference among the treatments.

Keywords: Herbicides, Crop characters, Controlling weeds, Aman rice

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

Start Date: 00-07-1998

End Date: 00-12-1998

Program Area: Pest Management

Commodity: Rice

Objectives:

To study the effect of herbicides on different crop characters used in controlling weeds of aman rice grown under wet seeded condition.

Methodology:

The study was conducted at the Agronomy Field Laboratory, Department of Agronomy, Bangladesh Agricultural University, Mymensingh during July to December, 1998. The single factor experiment was laid out in a randomized complete block design (RCBD) having three replications. Thus, the treatment combinations was thirty and unit plot size was 4.0x2.5 m². The spacing between plot to plot was 1.0 m and block to block were 1.5 m. The treatments was randomly assigned in the unit plots of each block. The popular transplanted aman rice variety BR11 (Mukta) was selected for wet-seeded culture experimentation. It is non-lodging taking 140-145 days to complete its life cycle and can be successfully grown in aman season. The yield ranges between 5.5 to 6.5 t ha^-1.

Following ten treatments were used during the study:

T₀	=	Control
T₁	=	Ronstar 25 EC @ 1.0 l ha^-1
T₂	=	Ronstar 25 EC @ 2.0 l ha^-1
T₃	=	Ronstar 25 EC @ 3.0 l ha^-1
T₄	=	Set off 20 WG @ 50 g ha^-1
T₅	=	Set off 20 WG @ 100 g ha^-1
T₆	=	Set off 20 WG @ 200 g ha ^-1
T₇	=	Golter 5G @ 12.35 kg ha^-1
T₈	=	Golter 5G @ 24.7 kg ha^-1
T₉	=	Golter 5G @ 49.4 kg ha^-1.

In control, no weeding as well as no weedicide were used. Pre-emergence application of all the weedicide was done. All the three weedicide were used as pre-emergence application. Certified seeds of BR11 was treated with vitavex-200 @ 2.5 g kg^-1 of seeds (Anonymous, 1979). Seeds were sown @ 80 kg ha^-1. For land preparation the land was irrigated and puddled thoroughly by ploughing three times with the country plough. The weeds and stubbles were thoroughly cleaned from the prepared field. Fertilizers were applied to the plots @ 60, 8, 30 and 4 kg ha^-1 as N, P, K and S on the basis of Fertilizer Recommendation Guide through urea, TSP, MP and gypsum, respectively. Seeds were evenly broadcasted on unit plot when about 80% of the seeds were sprouted, using conventional method. Irrigation was done as and when necessary. A quadrate of 1x1 m² was randomly placed on each plot and all the weeds (species -wise) in the quadrate was counted on 21st October, 1998. Then the average number of weeds (species-wise) per plot was computed from the results obtained in sampling. Data regarding the yield and yield contributing characters were collected and analysed statistically. For convenience of observation on the crop characters except the grain and straw yield were collected from 10 randomly selected plants from each of the plots. The sample plants were up rooted prior to harvest and sun-dried. The plant height was measured with the help of meter scale from the base of the plant to tip of the panicle. Panicle length was measured from the neck node to tip of the panicle. Number of grain and unfilled spikelets panicle^-1 were recorded separately. Data on crop characters as affected by different weed control treatments have been recorded. It was observed that crop characters were significantly or numerically affected by treatments. The data recorded were compiled and tabulated in proper form and subjected to statistical analysis. The mean differences among the treatments were adjusted by Duncan’s new multiple range test.

Source of Information: Journal of Agronomy, 2: 44-51, 2003; ISSN 1680-8207

Article Link (Online Journal): DOI: 10.3923/ja.2003.44.51; URL: http://scialert.net/abstract/?doi=ja.2003.44.51

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Yield and yield contributing attributes of BR11 rice were influenced by different doses of the herbicides used.

Knowledge Management: Journal