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Effect of Cultivar and Spacing on Weed Infestation and Performance of Transplant Aman Rice in Bangladesh.

M. Shahadat Hossain
SO
Crop Management Department,Agronomy Division,Bangladesh Jute Research Institute,Manik Mia Avenue, Dhaka-1207.

M. N. Newaj
Researcher
Department of Crop Botany,Bangladesh Agricultural University, Mymensingh.

M. K. Anam
Researcher
Department of Plant Pathology,Bangladesh Agricultural University, Mymensingh.

A. A. Mamun
Professor
Department of Agronomy,Bangladesh Agricultural University, Mymensingh.

Rikta Basak
Researcher
Department of Agronomy,Bangladesh Agricultural University, Mymensingh.

Abstract/ Executive Summary:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh , Bangladesh during July to December 2001 to find out the effect of Cultivar and spacing on weed infestation and performance of transplant aman rice. The cultivar used were Sonar Bangla 1, BRRI Dhan 39 and Nizershail and spacing tested were 10cm× 15cm,10cm× 20cm, 15cm× 25cm, 20cm× 30cm and 25cm×35cm. The experiment was carried out in a RCBD with three replication. Thirteen weed species belonging to eight families infested in the experimental plots. Cultivar, spacing and their interaction significantly affected weed density and weed dry weight. Cultivar significantly influenced all the crop characters studied with the exception of panicle length. Sonar Bangla 1 produced the highest grain and straw yields and Nizershail the lowest. Spacing had a significant effect on all the crop characters except panicle length and 1000-grain weight. The highest grain yield was obtained from the spacing 15cm× 25cm and the lowest grain yield was produced by the widest spacing 25cm × 35cm. Sonar Bangla 1 produced the highest grain yield in 15cm× 25cm spacing and Nizershail produced the lowest yield in 25cm× 35cm spacing.

Keywords: Effect, Cultivar, Spacing, Weed infestation, Performance, Transplant aman rice.

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh.

Start Date: 01-06-2001

End Date: 31-12-2001

Program Area: Pest Management

Commodity: Rice

Objectives:

To find out the plant spacing resulting minimum weed infestation and maximum yield.

Methodology:

An experiment was conducted at Bangladesh Agricultural University, Mymensingh in 2001 to study the weed infestation and crop performance of transplant aman rice as affected by cultivar and spacing. The experimental treatments included three cultivars viz., Sonar Bangla 1, BRRI Dhan 39 and Nizersail and five spacing viz., 10cm ´ 15cm, 10cm ´ 20cm, 15cm ´ 25cm, 20cm ´ 30cm and 25cm ´ 35cm. The experiment was laid out in a randomized complete block design (RCBD) with three replications. The experimental field was fertilized with Urea, T.S.P., MP., Gypsum and Zinc Sulphate (ZnSO₄) @ 270, 130, 120, 110 and 10 kg ha^-1, respectively for Sonar Bangla 1; 150, 100, 70, 60 and 10kg ha^-1, respectively for BRRI Dhan 39 and 90, 75, 60, 60 and 10 kg ha^-1, respectively for Nizershail. Seedlings of 21 days old were transplanted on 24 July 2001. Intercultural operations such as gap filling, weeding, water management and pest management were done as and when necessary. Data on weeds were collected from three 0.25 m² (0.5m ´ 0.5m) quadrate from each of the unit plots at different stages of crop plant such as 21 DAT, 42 DAT and flowering stage. Ten hills (excluding border hills) were randomly selected out side the 1.0m² area and uprooted from each unit plot prior to crop harvest for recording data on different plant characters. After sampling, the whole plot was harvested when about 90% of grains become golden yellow in colour. The data on different agronomic characters were recorded from the randomly selected hills in each plot and those on grain and straw yields were recorded from the middle 1.0m² area. All of the data were analyzed using Analysis of variance techniques and mean differences were adjusted by DMRT.

Source of Information: Pakistan Journal of Agronomy. 2(3): 169 – 178.

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 10000

Total Budget (Tk.) : 10000

Achievement/Findings:

Thirteen weed species belonging to eight families infested in the experimental plots. Sonar Bangla 1 produced the highest grain and straw yields and Nizershail the lowest. The highest grain yield was obtained from the spacing 15cm×25cm and the lowest grain yield was produced by the widest spacing 25cm×35cm. Sonar Bangla 1 produced the highest grain yield in 15cm×25cm spacing and Nizershail produced the lowest yield in 25cm×35cm spacing.

Knowledge Management: Journal