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Nitrogen Level and Weed Control Interaction in Drum Seeded Boro Rice

B.K. Das
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M.P. Anwar
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

S.M.R. Karim
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M.A.K. Miah
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

S. M. Salahuddin
Seed Technologist, NORA AGRO SERVICES, Dhaka, Bangladesh

Abstract/ Executive Summary:

An experiment involving four levels of nitrogen viz. 0, 60, 90, 120 kg ha^-1 and five weed control methods viz. no weeding, 3 hand weeding, Rifit 500EC @ 0.5 L ha^-1, Rifit 500EC @ 0.75 L ha^-1, Rifit 500EC @ 1.0 L ha^-1 was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh from December 2005 to May 2006 to evaluate the effect of nitrogen level and weed control method on the control of weeds and yield of BRRI dhan29. Among the nitrogen levels, 120 kg ha^-1 performed as the best in terms of grain yield (5.47 t ha^-1) followed in order of 90 kg ha^-1 (4.22 t ha^-1), 60 kg ha^-1 (3.29 t ha^-1) and 0 kg ha^-1 (2.45 t ha^-1). The highest grain yield (4.77 t ha^-1) was achieved from the application of Rifit 500EC @ 1.0 L ha^-1 followed by 3 hand weeding (4.42 t ha^-1). No weeding treatment produced the lowest grain yield (2.69 t ha^-1). The highest N level of 120 kg ha^-1 interacted favourably with Rifit 500EC @ 1.0L ha^-1 to produce the highest grain yield (6.62 t ha^-1) which was statistically similar to that produced by the treatment combination of 120 kg N ha^-1 and 3 hand weeding. Therefore, higher yield of BRRI dhan29 under drum seeded condition and better weed control could be achieved by the application of 120 kg N ha^-1 and Rifit 500EC @ 1 l ha^-1.

Keywords: Nitrogen level, Weed control, Weed growth, Grain yield and boro rice

Location: Agronomy Filed Laboratory, Bangladesh Agricultural University

Start Date: 00-11-2005

End Date: 00-05-2006

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

1. To identify the most suitable combination of nitrogen level and weed control method for better weed control and higher yield of BRRI dhan29.

Methodology:

An experiment was conducted at the Agronomy Filed Laboratory, Bangladesh Agricultural University, Mymensingh from November 2005 to May 2006 with a view to findings out the effect of nitrogen level and weed control method on the performance of boro rice cv. BRRI dhan29 under direct wet seeding method by using drum seeder. The experiment consisted of four levels of nitrogen viz. 0, 60, 90 and 120 kg ha^-1, and five weed control methods viz. no weeding, 3 hand weeding(at 15, 30 and 45 days after sowing), Rifit 500EC @ 0.5 L ha^-1, Rifit 500EC @ 0.75 L ha^-1and Rifit 500EC @ 1 L ha^-1. Rifit is a systemic pre-emergence herbicide and selective for rice. Its common name is pretilachlor. The experiment was laid out in a randomized complete block design with there replications. The unit plot size was 4m × 2.5m and total number of unit plot was 60. The experimental field is located at 24075' N latitude and 90050' E longitude at an altitude of 18 m above sea level. The experimental site belongs to the Old Brahmaputra Floodplain Agro-ecological Zone: AEZ-9. The land was medium high with silty loam texture, low fertility level and slightly acidic in nature (pH = 6.8). Soil organic carbon and total nitrogen were recorded 0.89% and 0.16%, respectively. The average temperatures recorded in different months during the experimental period were 20.10^oC (December), 18.10^oC (January), 21.87^oC (February), 25.09^oC (March), 26.45^oC (April), 28.09^oC (May), while the total month wise rainfall were recorded as 18.0, 3.4, 26.6, 83.6, 146.6 and 413.2 mm, respectively. The average relative humidity ranged from 74 to 83% during the experimental period. The experimental plot was fertilized with TSP, MP, Gypsum and Zinc sulphate at the rate of 130, 120, 70, 10 kg ha-1 as basal doses. Urea was top dressed at 30, 45 and 60 days after sowing as per treatment specification. Sprouted seeds were air dried for 8 hours under shade for proper separation of seeds and then sown by a drum seeder on 22 December, 2005 in the well leveled plots. Intercultural operations were done as and when necessary. Five hills were selected randomly from each unit plot excluding border rows before final harvest for data collection. Weeds were collected from the peripheral sampling area by using a plant quadrate of 0.50m × 0.50m size. The weeds inside each quadrant were uprooted, cleaned and dried first in sun and then in an electrical oven for 72 hours at a temperature of 80° C. The dry weight was then taken by an electric balance and expressed in gm^-2. For collecting yield data the central 1m² area was harvested when 90% of the grains became golden yellow in color. The harvested crop was then threshed and dried properly. The weights of grain and straw were recorded (at 14% moisture content) and converted into t ha^-1. Data were analysed using the “Analysis of Variance Technique” and mean differences were adjudged by Duncan’s Multiple Range Test.

Source of Information: J. Agrofor. Environ. 1(2): 47-51, 2007 ; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Higher yield of BRRI dhan29 under drum seeded condition and better weed control could be achieved by the application of 120 kg N ha^-1and Rifit 500EC @ 1 l ha^-1.

Knowledge Management: Journal