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Effect of Weeding Regime on the Weed Infestation and Crop Performance of Transplant Aman Rice

S M A Hoque
Territory Sales Manager,
Shetu Marketing Company (SEMCO), Dhaka, Bangladesh

M D Hossain
Lecturer
Department of Agribusiness, Atish Dipankar University of Science and Technology(ADUST); Bangladesh

K H Talukder
Professor & Dean
Faculty of Agriculture, Biological Science, Biotechnology & Textile, Atish Dipankar University of Science and Technology (ADUST)

M Asaduzzaman
Executive Director
Bangladesh Science Foundation, Dhaka, Bangla

M A Sayed5

M N Hoque6

Abstract/ Executive Summary:

An experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to study the effect of weeding regime on the weed infestation and crop performance on transplant aman rice. The treatments included 10 weeding regime - i) no weeding, ii) one hand weeding at 21 DAT, iii) two hand weeding at 21 and 42 DAT, iv) three hand weeding at 21, 42 and 63 DAT, v) Ronstar 25 EC @ 2.0 lha-1 at pre-emergence, vi) 2, 4-D amine @ 1.84 lha-1 at 42 DAT, vii) Ronstar 25 EC @ 2.0 lha-1 at Pre-emergence + 2, 4-D amine @ 1.84 lha-1 at 42 DAT, viii) Ronstar 25 EC @ 2.0 lha-1 at Pre-emergence + one hand weeding at 42 DAT, ix) one hand weeding at 21 DAT + 2. 4-D amine @ 1.84 lha-1 at 42 DAT and X) weed free. The experiment was laid out in a randomized complete block design with four replications. Weeding regime had significant effect on weed density and dry weight. Weed density and dry weight were significantly highest in the crop not weeded at all and lowest in Ronstar 25 EC @ 2.0 l ha -1 + one hand weeding . Plant height, total number of tillers hill-1, number of ear bearing tillers hill-1 , number of non ear bearing tillers hill-1 , number of grains panicle -1 ,number of sterile spike lets panicle -1, grain yield, straw yield, biological yield and harvest index were significantly affected by weeding regime. Ronstar 25 EC @ 2.0 lha-1 + one hand weeding controlled the weeds to the greatest extent and produced the yield and yield attributes similar to those in weed free treatment.

Keywords: Weeding Regime, Weed Infestation, Crop Performance and Transplant Aman Rice.

Location:

Start Date:

End Date:

Program Area: Pest Management

Commodity: Weed management

Objectives:

The present study was, therefore, undertaken to study the effect of weeding regime on the weed infestation and crop performance of transplant aman rice.

Methodology:

An Experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University (BAU), Mymensingh to study the effect of weeding regime on the weed infestation and crop performance of transplant aman rice. The experiment was laid out in a randomized complete block design with four replications. The treatments included 10 weeding regime-i) no weeding , ii) One hand weeding at 21 DAT, iii) two hand weeding at 21 and 42 DAT, iv) three hand weeding at 21, 42 and 63 DAT, v) Ronstar 25 EC @ 2.0 1 ha-1 at pre-emergence , vi) 2, 4-D amine @ 1.84 1 ha-1 at 42 DAT, vii) Ronstar 25 EC@ 2.0 1 ha-1 at pre- emergemce + 2, 4-D amine @ 1.84 1ha-1 at 42 DAT viii) Ronstar 25 EC@ 2.0 1 ha-1 at pre- emergemce + one hand weeding at 42 DAT ix) One hand weeding at 21 DAT + 2, 4-D amine @ 1.84 1ha-1 at 42 DAT and x) weed free. The area of unit plot was 0.0015 ha (5mx3m). The treatments were allocated in each block at random. The land was fertilized with 69, 18.86, 20, 10.8 and 3.6 kg of N, P, K,S and Zn ha-1 through urea, triple super phosphate, muriate of Potash, gypsum and zinc sulphate, respectively. The whole amount of triple super phosphate, muriate of potash, gypsum and zinc sulphate were applied as basal dose at final land preparation and the whole amount of urea was top dressed in three equal installments at 10, 30 and 55 DAT. The seedlings of BR11 ( Mukta) were transplanted on the well puddled unit plots maintaining a spacing of 25 cm x 15 cm (row to row distance 25 cm and hill to hill distance 15 cm). Two seedlings were used per hill. Weeding was done as per the weeding regime. Irrigation was done when required. Proper preventive measures were taken to protect the crop from insect pests. The crop was harvested plot wise on 2 December 1999. Data were collected on the density and dry weight of the infesting weed species. Phytotoxicity of Ronstar 25 EC @ 2.0 1 ha-1 and 2, 4-D amine @ 1.84 1 ha-1 to experimental crop were determined by visual observations. Data on different crop characters were recorded at harvest of the crop. The mean differences of the analyzed data were adjudged as per Duncan's Multiple Range Test.

Source of Information: J. Sci. Foundation, 9(1&2): 27-40, June-December 2011 ISSN 1728-7855

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

So, considering the weed control efficiency and agroeconomic performance of transplant aman rice in respect of weeding regime, in the context of the present study, recommendation should go for weed control by Ronstar 25 EC @ 2.01 ha-1 + One hand weeding at 42 DAT. If, however, herbicide is not available and the weeds to be controlled by hand weeding, then one hand weeding at 21 DAT is recommended. On the other hand, where there is scarcity of labor and the situation demands the use of herbicide for controlling the weeds, one should go for controlling weeds by Ronstar 25 EC @ 2.01 ha-1 at pre-emergence.

Knowledge Management: Journal