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Effect of Variety and Weeding Regime on the Yield Components and Yield of Aus Rice

Mr. F. Zaman
MS Fellow
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202Bangladesh

Abstract/ Executive Summary:

A field experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, during the period from April to July 2012 to study the effect of variety and weeding regime on the yield components and yield of Aus rice. The experiment was laid out in a randomized complete block design with three replications. The experimental treatments comprised four varieties viz. BR 26, BRRI dhan27, BRRI dhan48 and Pariza; and five weeding treatments viz. no weeding, one hand weeding at 20 DAS(Days after sowing), two hand weeding at 20 DAS and 30 DAS, three hand weeding at 20, 30 and 40 DAS and weed free. Here broadcasting method of planting was used. Results revealed that varieties had significant effect on plant height, number of total tillers hill^-1, number of effective tillers hill^-1, number of non-effective tillers hill^-1, number of grains panicle^-1, number of unfilled spikelets panicle^-1, 1000-grain weight, grain yield, straw yield, biological yield and harvest index. Grain yield was the highest in BRRI dhan48. 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 three, two and one weeding conditions. Interaction between variety and weeding regime significantly influenced all the studied crop parameters except 1000-grain weight and harvest index. In interaction it was observed that the highest grain yield was obtained from BRRI dhan48 under two weeding condition.

Keywords: Aus rice, Variety, Weeding regime, Yield

Location: Mymensingh

Start Date: 00-04-2012

End Date: 00-07-2012

Program Area: Pest Management

Commodity: Infestation

Objectives:

To evaluate the performance of four varieties of Aus rice
To find out the number of weeding necessary for successful Aus rice production
To observe the interaction effect of variety and weeding regime on the yield components and yield of Aus rice.

Methodology:

The experiment was conducted with broadcast Aus rice (Oryza sativa L.) at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, during the period from April to July 2012 to study the effect of variety and weeding regime on the yield components and yield of broadcast Aus rice.The experimental area belongs to the Agro-ecological Zone of the Old Brahmaputra floodplain (AEZ-9), having non-calcareous dark grey floodplain soil (FAO, 2009). The experiment field was medium high land having sandy loam soil with pH 6.8. The experiment included two factors, four varieties viz. BR26, BRRI dhan27, BRRI dhan48 and Pariza. Broadcasting method was followed here and five weeding viz. no weeding, one hand weeding at 20 DAS, Two hand weeding at 20 DAS and 30 DAS, Three hand weeding at 20, 30 and 40 DAS and weed free. The experiment was laid out in randomized complete block design with three replications. The area of each unit plot was 4.0mx2.5 m. The spaces between blocks and between plots were 1 m and 75 cm, respectively. The land was opened with a power tiller on 19 April 2012. The field was thoroughly prepared with the help of country plough and ladder and was uniformly fertilized with urea, triple super phosphate, muriate of potash, gypsum and zinc sulphate @ 80, 60, 40, 60 and 10 kg ha^-1, respectively. All of the fertilizers were applied at the final land preparation but urea was applied at 3 equal split applications at 15, 30 and 45 days after sowing (DAS). The land was finally prepared on 24 April 2012. The field layout was done on the next day. Then the seeds were sown in the field on 25 April 2012. The intercultural operations were done whenever necessary. When 90% of the spikelets became golden yellow in colour, the crop was harvested just above ground level on 22July 2012. The harvested crop of each plot was separately bundled, properly tagged and then brought to threshing floor. The grains were cleaned and sun dried and straws were also sun dried properly. Finally grain and straw yields plot^-1 were recorded and converted to t ha^-1. Grain yield was adjusted to 14% moisture content. Data recorded for different parameters were compiled and tabulated in proper form. Analysis of variance was done following Randomized Complete Block Design with the help of computer package program MSTAT. The mean differences among the treatments were tested with Duncan’s Multiple Range Test (Gomez and Gomez, 1984).

Source of Information: J. Bangladesh Agril. Univ. 11(1): 17–21, 2013, ISSN 1810-3030

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 300000

Total Budget (Tk.) : 300000

Achievement/Findings:

From the results of the experiment it can be concluded that the variety BRRI dhan48 is suggested to cultivate in Aus season under broadcasting method with two weeding at 20 DAS and 30 DAS for better yield. However, further experiments are suggested to be conducted in different agro-ecological zones to arrive at a definite conclusion.

Knowledge Management: Journal