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Effect of Nitrogen Fertilizer and Weed Management on the Yield of Transplant Aman Rice

Jyoti Adhikari
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Md. Abdur Rahman Sarkar
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Md. Romij Uddin
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Uttam Kumer Sarker
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Kawsar Hossen
Department of Agriculture, Noakhali Science and Technology University, Noakhali, Bangladesh

Umme Rosemila
Department of Biotechnology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

The research work was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during aman season from July to December, 2015 to study the effect of nitrogen fertilizer and weed management on the growth and yield of transplant aman rice cv. BRRI dhan46. The experiment consisted of four fertilizer treatments viz. 0 kg N ha⁻¹ (N0), 40 kg N ha⁻¹(N1), 80 kg N ha⁻¹(N2) and 120 kg N ha⁻¹ (N3) and four weeding treatments viz. one hand weeding at 20 DAT (W1), two hand weedings at 20 and 35 DAT (W2), three hand weedings at 20, 35 and 50 DAT (W3), weeding by Japanese rice weeder twice at 20 and 35 DAT (W4) and unweeded control (W5). The experiment was laid out in randomized complete block design with three replications. The highest plant height (113.00 cm), number of total tillers hill⁻¹ (8.74), number of effective tillers hill⁻¹ (6.18), panicle length (21.98 cm), number of grains panicle⁻¹ (114.20), grain yield (4.00 t ha⁻¹), straw yield (5.25 t ha⁻¹) and biological yield (9.25 t ha⁻¹) were recorded in N2 (80 kg N ha⁻¹) treatment. The lowest plant height (106.00 cm), number of total tillers hill^–1 (7.20), number of effective tillers hill⁻¹ (5.00), panicle length (20.70 cm), number of grains panicle^–1 (97.60), grain yield (3.52 t ha⁻¹), straw yield (4.46 t ha⁻¹) and biological yield (7.97 t ha⁻¹) were recorded from N0 (No nitrogen fertilizer control) treatment. On the other hand, the highest grain yield 4.23 t ha⁻¹ was observed in three weedings condition because of the highest number of effective tillers hill⁻¹ (6.81), number of grains panicle⁻¹(111.10). The highest straw yield (5.51 t ha⁻¹) was also found in three weeding condition. The lowest grain yield (3.40 t ha⁻¹) was recorded in W5 (unweeded control) treatment. The lowest straw yield (4.31 t ha⁻¹) was also observed in W5 (unweeded control) treatment because of the smallest plant (106.97 cm) and lower number of total tillers hill⁻¹ (7.20). Therefore, 80 kg N ha⁻¹ along with three hand weedings at 20, 35 and 50 DAT may be used for obtaining the highest grain and straw yields of BRRI dhan46.

Keywords: Nitrogen management, Weeding, Unweeded control, Yield, Harvest index

Location: Agronomy Field Laboratory, Bangladesh Agricultural University (BAU), Mymensingh during the period from July to December, 2015

Start Date: 00-07-2015

End Date: 00-12-2015

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer, Weed management, Rice

Objectives:

The study was conducted to optimize nitrogen and weed management in transplant aman rice.

Methodology:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University (BAU), Mymensingh during the period from July to December, 2015 to study the effect of nitrogen fertilizer and weed management on the growth and yield of transplant aman rice. The experimental site belongs to the Old Brahmaputra Floodplain Agro ecological Zone (AEZ-9). Non calcareous dark-grey floodplain soil is generally predominant in the site. The land type was medium high and the soil was silty loam in texture. The pH value of the soil was 6.8 and the soil is low in organic matter content. The variety BRRI dhan46 was used as the test crop in the experiment. BRRI dhan46 with photoperiod sensitivity is suitable for late transplanting in aman season after the recession of flood water. Its average grain yield is 4.7tha^–1. The experiment consisted of 4 levels of Nitrogen viz. 0 kg N ha^–1 (N0), 40 kg N ha^–1 (N1), 80 kg N ha^–1 (N2) and 120 kg N ha^–1 (N3) and five weeding treatments viz. One hand weeding at 20 DAT (W1), two hand weedings at 20 and 35 DAT (W2), three hand weedings at 20, 35 and 50 DAT (W3), weeding by Japanese rice weeder twice at 20 and 35 DAT (W4) and unweeded control (W5). The experiment was laid out in a randomized complete block design with three replications. Each block was divided into twenty unit plots of size 4.0m×2.5m each. Thus, the total number of unit plot was 60 (20×3). The distance maintained between two unit plots was 0.5m and between blocks was 1m. Nitrogen was applied accordingly experimental specification in the form of urea at three splits application. Five hills were randomly selected and marked with the bamboo sticks in each unit plot excluding border rows to record the data on yield contributing characters and yield. Recorded data were analyzed statistically using “Analysis of Variance Technique and the differences among treatment means were adjudged by Duncan’s Multiple Range Test (DMRT).

Source of Information: J Bangladesh Agril Univ 16(1): 12–16, 2018 ISSN 1810-3030 (Print) 2408-8684 (Online)

Article Link (Online Journal): doi: 10.3329/jbau.v16i1.36473

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

For the result of the present study it can be concluded that 80 kg N ha⁻¹ along with three hand weedings at 20, 35 and 50 DAT may be used to obtain the highest grain and straw yields of transplant aman rice cv. BRRI dhan46. Farmers will follow this suggestion because it will help them to obtain a satisfactory yield. It will also help to determine the optimum nitrogen level, to find out the appropriate weed control treatments and to find out the effect of interaction between nitrogen fertilizers and weed management on the growth and yield of transplant aman rice cv. BRRI dhan46.

Knowledge Management: Journal