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Effect of Spacing and Weeding Regime on the Performance of Aus Rice Cv. Br26

M S Rahmant
Training Coordinator
HEED Bangladesh, Gaibandha

M P Anwar
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M M Rahmant
Department of Agronomy, Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur

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

M M Rahman
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

A field experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from April to August, 2004 to study the effect of spacing and weeding regime on the performance of aus rice cv. BR26. The experiment comprised four spacing viz.20 cm x 15 cm, 25 cm x 15 cm, 20 cm x 20 cm, 25 cm x 20 cm and six weeding regimes viz. no weeding, one weeding at 15 days after transplanting (DAT), one weeding at 20 DAT, two weeding at 15 DAT + 30 DAT, two weeding at 20 DAT + 35 DAT and a weed free treatment. The experiment was laid out in a randomized complete block design with three replications. Results obtained from the experiment revealed that the highest grain and straw yield were obtained from the 20 cm x 15 cm spacing. Weed free condition produced the highest grain and straw yield whereas unweeded condition produced the lowest grain and straw yield. But from economic view point two weeding at 20 DAT + 35 DAT was found the best due to highest benefit cost ratio. Interaction between spacing and Weeding regime significantly influenced all studied parameters such as plant height, total tillers m^-1 effective tillers m^-2, non-effective tillers m^-2, grains panicle^-1 ,sterile spikelet panicle^-1, grain yield and straw yield except 1000 grain weight. The highest grain yield was obtained from the combination of 20 cm x 15 cm spacing and weed free regime. Therefore, it may be concluded that BR26 should be transplanted at 20 cm x 15 cm spacing with weed free regime in aus season for having maximum grain yield but two weeding at 20 DAT + 35 DAT may also be practiced for maximum economic return.

Keywords: Spacing Weeding regime, Yield, Economic performance, BR26

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-04-2004

End Date: 00-08-2004

Program Area: Pest Management

Commodity: Rice

Objectives:

To identify the suitable spacing and to determine the appropriate weeding regime for aus rice cv. BR26

Methodology:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from April to August 2004 in order to evaluate the effect of spacing and weeding regime on the performance of aus rice cv. BR26. The experiment comprised four spacings viz.20 cm x 15 cm, 25 cm x 15 cm, 20 cm x 20 cm and 25 cm x 20 cm and six weeding regimes viz. no weeding, one weeding at 15 DAT, one weeding at 20 DAT, two weeding at 15 DAT + 30 DAT, two weeding at 20 DAT + 35 DAT and weed free. The experiment was laid out in randomized complete block design with three replications. The unit plot size was 5 m2 (2.5 m x 2.5 m). The crop was fertilized with phosphorus, potassium, sulphur and zinc @ 20, 35, 10 and 2 kg ha^-1 n the form of triple super phosphate, muriate of potash, gypsum and zinc sulphate, respectively just before final land preparation. Nitrogen was applied @ 60 kg ha^-1 as urea which was top dressed in three equal splits at 15, 30 and 45 days after transplanting (DAT). Thirty day old seedlings were transplanted using two seedlings hill^-1 on 5th May 2004. Intercultural operations were done as and when necessary. Five hills were randomly selected from each unit plot prior to harvest for recording different data on plant characters and yield components. The whole plot was harvested when 90% of the grains became golden yellow in colour. The harvested crop was threshed and dried, and weight of grain and straw was recorded and converted into t ha^-1. Data on yield and yield contributing characters were recorded at harvest on different parameters such as plant height, total tillers m^-2, effective tillers m^-2, noneffective tillers m^-2, grains panicle^-1, sterile spikelet panicle^-1, 1000-grain weight, grain yield, straw yield and harvest index, Data were analyzed using the, analysis of Variance" technique and mean different were adjudged by Duncan' Multiple Range Test (DMRT). The cost of individual head of expenditure was also recorded and partial budget analysis was done to calculate gross return, gross margin and benefitcost ratio, for different weeding regimes.

Source of Information: Bangladesh J. Prog. Sci. & Tech. 5(1): 129-132; (2007)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The findings of the study reveals that BR26 should be transplanted at 20 cm x 15 cm spacing with weed free in aus season for having maximum grain yield but two weeding at 20 DAT + 35 DAT may also be practiced for maximum economic return.

Knowledge Management: Journal