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Ffect of Weeding Regime on the Performance of Direct-seeded Aus Rice

Md. Farukur Rahman
Agrotechnology Discipline, Khulna University, Khulna 9208, Bangladesh

Mahtalat Ahmed and
Agrotechnology Discipline, Khulna University, Khulna 9208, Bangladesh

Md. Sarwar Jahan*
Agrotechnology Discipline, Khulna University, Khulna 9208, Bangladesh

Abstract/ Executive Summary:

A field experiment was conducted to find out the impact of weeding regime on the performance of three Aus rice. The experimental treatment consisted of three varieties of rice viz. BRRI dhan28, Bere Ratna and Kajol Lata, and four weeding regimes viz. no weeding, one hand weeding at 35 days after sowing (DAS), two hand weedings at 20 and 35 DAS and three hand weedings at 20, 35 and 50 DAS. The experiment was laid out in a factorial randomized complete block design with three replications. Eleven weed species belonging to five families infested the experimental plots; Cyperus rotundus L. and Imperata cylindrica (L.) Baeuv. were the dominant. The effect of weeding regime on weed density (except at 20 DAS) and weed dry weight was statistically significant. The results indicated that three hand weedings at 20, 35 and 50 DAS produced the highest number of effective tillers hill-1 , number of filled grains panicle-1 , 1000- grain weight and grain yield. Among the varieties Bere Ratna gave the highest grain yield.

Keywords: Weeding regime, Aus rice, BRRI dhan28, Bere Ratna, Kajol Lata

Location: Field Laboratory of Agrotechnology Discipline, Khulna University, Khulna

Start Date: 00-05-2007

End Date: 00-09-2007

Program Area: Pest Management

Commodity: Weed management, Rice

Objectives:

The best weeding regimes need to be found out with a view to reduce yield losses due to weed infestation and getting maximum yield of Aus rice. Keeping the above facts in view, the present study was conducted to find out the effect of weeding regime on the yield and yield components of three Aus rice cultivars and to optimize the time of weeding for obtaining higher yield of Aus rice.

Methodology:

The experiment was conducted at the Field Laboratory of Agrotechnology Discipline, Khulna University, Khulna during May to September, 2007. A factorial randomized complete block design with three replications was followed for the experiment. The experimental treatment included four weeding regimes viz., no weeding, one hand weeding at 35 DAS, two hand weedings at 20 and 35 DAS and three hand weedings at 20, 35 and 50 DAS and three rice varieties viz., BRRI dhan28, Bere Ratna and Kajol Lata. There were 36 plots in the experiment and the size of unit plot was 4.0 m × 2.5 m. The land was prepared thoroughly tilling twice with power tiller and subsequently plowing one time with country plough followed by laddering. All weeds, stubble and crop residues were removed and the field was divided into unit plot according to the design. According to the Bangladesh Rice Research Institute (BRRI), recommended rate of urea, triple superphosphate, muriate of potash, gypsum and zinc sulphate were applied at the rate of 150, 50, 75, 35 and 5 kg ha-1 . The whole amount of TSP, MOP, gypsum and zinc sulphate were applied as basal dose in the unit plot at the time of final land preparation and they were thoroughly incorporated to soil with the help of spade. Urea was top dressed in two equal splits at 25 and 45 days after sowing. Seeds were sown at the rate of 5-6 seeds hill-1 maintaining a spacing of 20 cm from hill to hill and 25 cm from row to row. After germination, seedling(s) was thinned maintaining 3 seedlings hill-1 . The experimental plots were irrigated as and when necessary and excess water was drained out at the time of heavy rainfall.

After counting the weed density m-2 , the collected weeds were dried in an electronic oven for 72 hours at a temperature of 70⁰C. Weed dry weight was calculated as g m-2 . For data collection the following parameters were considered: i) Number of total tillers hill-1 ii) Effective tillers hill-1 iii) Panicle length (cm) iv) Number of filled grains panicle-1 v) Unfilled grains panicle-1 vi) Thousand-grain weight (g) vii) Grain yield (t ha-1 ) viii) Straw yield (t ha-1 ) ix) Biological yield (t ha-1 ) and x) Harvest index (%).

Data were statistically analyzed using the “Analysis of Variance” technique with the help of statistical computer package MSTAT-C. The mean differences were compared by Duncan’s New Multiple Range Test (Gomez and Gomez, 1984).

Source of Information: Khulna University Studies Volume 11 (1&2) and 12(1&2) :December 2013

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Results suggest that different weeding regimes greatly affected the weed growth, yield contributing characters and grain yield of Aus rice varieties. Weeding regime and variety had significant effect on yield and yield contributing characters of Aus rice. From the present study it might be concluded that i) three hand weedings at 20, 35 and 50 DAS produce the highest number of effective tillers hill-1, number of filled grains panicle-1 , 1000-grain weight and grain yield in aus rice varieties. ii) Bera Ratna is better than others regarding yield. iii) Direct seeded Aus rice must be kept weed free till 35 DAS to obtain better yield.

Knowledge Management: Journal