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Effect of Weed Management Practices on the Performance of Transplanted Aman Rice Varieties

J. Ferdous
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

N. Islam
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

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

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

Abstract/ Executive Summary:

A field experiment was carried out to study the effect of weed management practices on the performance of transplanted aman rice varieties. The experimental treatments comprised three varieties viz. BR11, BRRI dhan39 and Binadhan7 and seven weeding treatments viz., weedy check, hand weeding at 15 and 35 DATs, application of early post-emergence herbicide Manage (Pyrazosulfuron ethyl), application of pre-emergence herbicide Rifit (Pretilachlor), Manage + one hand weeding at 35 DAT, application of Rifit + one hand weeding at 35 DAT and weed free. The experiment was laid out in a randomized complete block design with three replications. The results reveal that varieties should significant variation on plant height, number of total tillers hill^-1, number of effective tillers hill^-1, number of non-effective tillers hill^-1, panicle length, number of grains panicle^-1, number of sterile spikelets penicle^-1, 1000-grain weight, grain yield, straw yield and harvest index. Grain yield was the highest in BRRI dhan39. Weeding regime had also significant effect on all the studied crop parameters except 1000-grain weight. The highest grain yield was obtained from weed free condition followed by hand weeding at 15 and 35 DATs. Interaction between variety and weeding regime had significant influence on all the studied crop parameters except 1000-grain weight. The highest grain yield was obtained from the interaction of BRRI dhan39 × weed free condition which was statistically identical (5.50 t ha^-1) with interaction of variety BR11 × two hand weeding at 15 and 35 DATs. Therefore it may be concluded that BR11 rice could be cultivated using two hand weeding at 15 and 35 DATs for obtaining higher yield.

Keywords: Transplanted aman rice, Variety, Weed, Herbicide, Rice

Location: Agronomy Field Laboratory of Bangladesh Agricultural University, Mymensingh

Start Date: 00-06-2013

End Date: 00-12-2013

Program Area: Crop-Soil-Water Management

Commodity: Rice, Weed management

Objectives:

The study was therefore, undertaken to observe the effect of variety, different weeding regimes and interaction effects of variety and different weeding regimes on the performance of transplanted aman rice

Methodology:

The experiment was conducted at the Agronomy Field Laboratory of Bangladesh Agricultural University, Mymensingh during the period from June to December 2013 to study the effect of weed management practices on the performance of transplanted aman rice varieties. The experimental area is characterized by non-calcareous dark grey floodplain soil belonging to the Sonatala Soil Series under the Old Brahmaputra Floodplain, Agro-Ecological Zone 9 (UNDP and FAO, 1988). The experimental field was medium high land having silty loam soil with pH 6.8. The experiment included two factors, three varieties viz V1 (BR11), V2 (BRRI dhan39) and V3 (Binadhan-7) and seven weeding treatments viz. W1 (weedy check), W2 (hand weeding at 15 and 35 DATs), W3 (application of early post-emergence herbicide Manage (1 L/ha), W4 (application of pre-emergence herbicide Rifit (185 g/ha)), W5 (application of manage + one hand weeding at 35 DAT), W6 application of Rifit + one hand weeding at 35 DAT) and W7 (weed free). The experiment was laid out in a randomized complete block design (RCBD) with three replications. Total number of unit plots was 3×7×3=63 and each plot size was 4.0 m × 2.5 m. The distance maintained between the individual unit plots was 0.5 m and that between the replications was 1.0 m. The sprouted seeds were sown in the nursery bed on 15 June 2013. The land was thoroughly prepared with the help of country plough and ladder and was uniformly fertilized with urea, triple superphosphate, muriate of potash, gypsum and zinc sulphate @ 200, 115, 125, 100 and 12 kg ha-¹, respectively (BRRI, 2011). All the fertilizers were applied at the time of final land preparation but urea was applied at three equal splits at 15, 30 and 45 DATs. The layout of the field was made after final land preparation. The seedlings were uprooted on 16 July 2013 and they were immediately transferred to the main field. Rice was transplanted on 16 July 2013. The intercultural operations were done whenever it necessary. When 90% of the spikelets become golden yellow in color the crops were harvested. BRRI dhan39 and Binadhan7 were harvested on 20 November and BR11 was harvested on 11 December 2013. The harvested crop of each plot was separately bundled, properly tagged and then brought to (21 days earlier than that of variety BR11) threshing floor. The grains were cleaned and sun dried and straws were also sun dried properly. Finally grains and straw yields plot-1 were recorded and converted to t ha-1. The recorded data were compiled and tabulated for statistical analysis. Analysis of variance was done with the help of computer package, MSTAT. The mean differences among the treatments were adjudged by Duncan’s Multiple Range Test (Gomez and Gomez, 1984).

Source of Information: J. Bangladesh Agril. Univ. 14(1): 17–22, 2016

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the results of the study it may be concluded that among the different treatment combinations, BR11 rice with two hand weeding at 15 and 35 DATs might be done for controlling weed effetely and for obtaining higher yield of transplanted aman rice.

Knowledge Management: Journal