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Effect of Weed Control on the Performance of Transplant BRRI Dhan 32

MS Islam
Soil Resource Development Institute, krishi kamar sarak, Farmgate, Dhaka 1215

H Akter
Soil Resource Development Institute, krishi kamar sarak, Farmgate, Dhaka 1215

S Aktar
Soil Resource Development Institute, krishi kamar sarak, Farmgate, Dhaka 1215

J Miah
Soil Resource Development Institute, krishi kamar sarak, Farmgate, Dhaka 1215

SSF Hossain
Department of Agriculture Extension, Gafargaon, Mymensingh 2202

Abstract/ Executive Summary:

A field experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during July to December 2003 to find out the effect of weed control on the performance of transplant Aman rice cv. BRRI Dhan 32. Weed control treatments Included in the study were no weeding, one hand weeding, two hand weeding, one hand weeding+one weeding with Japanese rice weeder, Rift @ 0.5, 0.75, 1.0, and 1.25 L ha^-1 and Rostar @ 1.0, 1.5, 2.0, and 2.5 L ha^-1. Important weed species found to infest the crop were Angta (Panicum repens), Acidgras (Ammania bacifera L.) Nackphulee (Cyperous difformis), Khudeshama (Echinochloa crusgalli) was the least important weed species. Higher doses of Rift 1.25L ha^-1 and Ronstar 2.5 L ha^-1 showed the best performance in reducing weed density and weed dry weight. The highest grain yield (5.0 4 ton ha^-1) was obtained from Ronstar 2.0 L ha^-1 which was identical with the second highest grain yield (4.93 t ha^-1) obtained from Rift 1.0 L ha^-1. The highest net income of tk. 38915 ha^-1 was obtained from Ronstar 2.0 L ha^-1 and the next highest from Rift 1.0L ha^-1.

Keywords: Weed control, T. Aman, Leaf blight, Tungro, Rice, Ronastar, phototoxic

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-07-2013

End Date: 00-12-2013

Program Area: Crop-Soil-Water Management

Commodity: Weed management, Rice

Objectives:

1. To study the effectiveness and economics of different cultural and chemical methods of weed control in T. Aman rice cv. BRRI Dhan 32;

2. To assess the different weed control methods and their yield performance.

Methodology:

A field experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during July to December 2013. The experiment was conducted on a medium high, well drained and leveled land belonging to non calcareous dark grey flood plain soil under Old Brahmaputra Floodplain (AEZ-9). The soil was silty loam having 0.11% total nitrogen, 0.93 % organic matter, 16.3 ppm available P, 0.27 % K and 13.9 ppm S with pH value 6.8 collected from 0-15 cm depth of the before opening the field. The crop under the study was BRRI Dhan 32. The cultivar was developed by the Bangladesh Rice Research Institute and it is moderately resistant to leaf blight, blast and tungro diseases (BRRI, 1995). Details of the climatic data during the study period have been recorded. The experiment was laid out in a RCBD design with four replications. Unit plot size was 10sq. m. The sprouted seeds were broadcast in the nursery bed on 7 July 2013. The field was fertilized with urea, TSP, MP, gypsum and zinc sulphate @ 150, 100, 70, 60, 10kg ha^-1 respectively. 30 days old seedlings were transplanted in the unit plots on 7 august, 2103. The crop was harvested plot wise at full maturity on 17 November, 2013. The data were collected on the following parameter: i. Plant height, ii. Total no. of tillers per hill, iii. No. of ear bearing tillers per hill, iv. No. of non ear bearing tillers per hill, v. Panicle length, vi. No. of grains per panicle, vii. No. of sterile spikelets per panicle, viii.1000-grain weight, ix. Grain yield, x. Straw yield, xi. Biological Yield, xii. Harvest index. Statistical analysis: Data were analyzed statistically using analyzed with computer package program MSTAT and the mean differences were adjudged by Duncan’s Multiple Range Test (DMRT) (Gomez and Gomez, 1984) and ranking was indicated by letters.

Source of Information: Progressive Agriculture 28 (4): 271-278, 2017

Article Link (Online Journal): DOI: https://doi.org/10.3329/pa.v28i4.36366

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The weed dry weight was significantly affected by weed control treatments. The lowest weed density (9.95) and dry weight (5.43) were observed in Ronstar 2.5 L ha^-1 and was followed by the treatment Rifit 1.25 L ha^-1. The highest weed density (104.97) and dry weight (68.63g m2) were obtained from the no weeding treatment which was significantly higher than those of other treatments. Application of Ronstar 2.5 L ha^-1 showed slight phototoxic effect on the rice plant which recovered within six days. Higher doses of Rifit and Ronstar showed better performance in reducing the weed density and increasing the weed control efficiency than the lower doses. All the characters except number of non -ear bearing tillers per hill and 1000- grain weight were significantly influenced by the weed control treatments. No weeding showed the inferiority than other weed control treatments. Two hand weeding and Ronstar 2.0 l ha^-1 and Rifit 1.0 L ha^-1 gave statistically identical effects in respect of plant hight ,no. of total tillers per hill , No. of ear bearing tillers per hill, No. of non ear bearing tillers per hill, Panicle length, total no. of grains per panicle, sterile, spiklets per panicle ,1000 grain weight, grain yield, straw yield, biological yield. Ronastar 2.0 L ha^-1 was produced highest grain yield (5.04 t ha^-1) and straw yield (6.45 t ha^-1) due to production of maximum number of grains (119.49 panicle^-1). The second highest grain and straw yield was obtained from Rifit 1.0 L ha^-1. From the economic analysis of the study the highest net income was obtained from the treatment of Ronstar 2.0 L ha^-1 (Tk. 38915 ha^-1) followed by Rifit 1.0 L ha^-1 and two weeding treatment. The herbicides Ronstar 2.0 L ha^-1 and Rifit 1.0 L ha^-1 were equally effective than the other weed control treatments in controlling weeds and in producing higher yield of grain.

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