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Efficacy of Herbicides as Affected by Application Time in Wheat

M.Z. Reza
M. S. Student
Department of Agronomy, Sher-e-Bangla Agricultural University.

M.H. Ali
Professor
Department of Agronomy, Sher-e-Bangla Agricultural University.

M. Sultana
Lecturer
Cambrian College, Dhaka.

H.M.M. Tariq Hossain
Professor
Department of Agronomy, Sher-e-Bangla Agricultural University.

Abstract/ Executive Summary:

Efficacy of different herbicides (Sencor 7 WG@ 500g ha^-1, Lintur 70 WG @ 250g ha^-1, Ronstar @ 1 liter ha^-1) applied at different growth stages of crop was studied for controlling weeds in wheat in a field experiments at the research farm of Sher-e-Bangla Agricultural University during 2007-08. A weedy check (no herbicide) was also included for comparison. Significant differences were found among the times of application of herbicides for biological yield, 1000 grains weight (g), and grain yield (t ha^-1). The interaction of the times of application and herbicides was significant for grain yield. Maximum 1000 grains weight (47.48g) was observed in plots treated with Ronstar, while minimum (38.17g) in weedy check plots (no herbicide). Biological yield (7.0 t ha^-1) and grain yield (3.16 t ha^-1) were higher in plots treated with Ronstar while lower biological yield (4.5 t ha^-1) and grain yield (1.62 t ha^-1) were in weedy check plots. Ronstar proved to be the most effective herbicides giving the maximum grain yield of (3.37 t ha^-1) and biological yield (7.3 t ha^-1), when applied at 21 DAS in wheat.

Keywords: Herbicides, Sencor 7 WG, Lintur 70 WG, Ronstar and wheat

Location: Agronomy farm of Sher-e-Bangla Agricultural University, Dhaka- 1207.

Start Date: 00-11-2007

End Date: 00-03-2008

Program Area: Pest Management

Commodity: Herbicide, Wheat

Objectives:

To find out the proper time of herbicide application and to compare the efficacies of different herbicides for controlling weeds for higher grain yield of wheat.

Methodology:

The experiment was conducted at the Agronomy farm of Sher-e-Bangla Agricultural University, Dhaka- 1207 to study the weed control efficacies of herbicides as affected by application times in wheat during the period of late November, 2007 to March, 2008. The land was prepared thoroughly and leveled by a ladder. Weeds and stubbles were removed from the field. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. The unit plot size was 3m X 2m. Row to row distance was 20 cm and plot to plot was 1m. Data were analyzed by ‘MSTAT’-C. The crop (cv. Shatabdi) was sown on 25 November, 2007 according to the design adopted. The recommended fertilizer dose of wheat which were applied as follows: Compost = 8000 Kg ha^-1, Urea =180 Kg ha^-1, TSP = 140 Kg ha^-1, MOP = 40 Kg ha^-1, Gypsum = 110 Kg ha^-1. The whole amount of all the fertilizers and two third of urea was applied during the final land preparation. The rest one third of urea was top dressed at first irrigation (20 DAS). Treatments comprised combinations of different herbicides (H₀-no herbicides, H₁- Sencor 7 WG, H₂ - Lintur 70 WG and H₃ - Ronstar having common names metribuzin, dicumba and oxadiazon respectively) and the growth stages of the crop (7, 14, 21 days after sowing mentioned as T₁, T₂ and T₃ respectively) of application. In no herbicide treatment plots water was sprayed. The plants were thinned to 4-5 cm distances at 15 days after sowing to maintain a uniform plant stand. Maturity of crop was determined when 80-90% of the grain became golden yellowish in color. The harvesting was done on 16^th March, 2008. Five pre-selected plants per plot were isolated out of which different yield attributing data were collected and was separately harvested and bundled properly, tagged and then brought to the threshing floor. For yield data 1m² random and bundled properly, tagged and then brought to the threshing floor for recording grain and straw yield. The grains were cleaned and sun dried to maintain an approximate moisture level of 12% of seeds. Straw was also sun dried properly. Finally grain and straw yields plot^-1 were determined and converted to ton ha^-1 Weight of 1000 seed (g), Grain yield (t ha^-1 Index (%) and dry weight of weed m^-2 areas from unit plots were also harvested at. The following data were recorded from the experiment: Plant height (cm), ), Straw yield (t ha^-1 ), Biological yield (t ha^-1 ), Harvest.

Source of Information: J. Expt. Biosci. 6(2):1-6, July 2015, ISSN 223-9626

Article Link (Online Journal): https://drive.google.com/file/d/0ByW-1TOyPqVNMWVuZE0xclc2ZTQ/view

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Ronstar proved to be the most effective herbicides giving the maximum grain yield of (3.37 t ha^-1) and biological yield (7.3 t ha^-1), when applied at 21 DAS in wheat.

Knowledge Management: Journal