COMPETITIVENESS OF AUS RICE VARIETIES AGAINST WEED INFESTATION

SD Shawon, MN Islam, M Biswas and S Sarker
Journal of the Sylhet Agricultural University, Volume 5, Issue 1, 2018, Pages 7-14

Abstract:

Experiments on Aus rice were conducted at the Agronomy Research Field of Sylhet Agricultural University, Sylhet and in the farmer’s field of Jaintapur and Gowainghat Upazila, Sylhet to find out the competitiveness of Aus rice varieties against weed infestation. The experiments were carried out within the period of April to August 2014. Five commercial rice varieties viz. BR3, BRRI dhan48, hybrid variety Aloron, BRRI dhan43, Iratom-24 along with three (3) local cultivars Aina Miah, Doom and Kanihati were included in the research field trial. On the other hand, survey of thirty farmer’s field along with researcher’s managed trial were conducted to know the weed situation. In farmer’s field, 5 (five) variety namely BR3, hybrid variety Aloron, BRRI dhan55, BRRI dhan48 and cultivar Aina Miah were included. Here each variety or cultivar considered as treatment. The experiment was laid out in randomized complete block (RCBD) design with three replications. Weed Competitive Index (CI) was calculated on the basis of average yield of all varieties and weed biomass. Result indicated that eight weed species were recorded in the research field trial, whereas 28 weed species were recorded in the farmer’s field trial. The most prominent weeds in the experiment were Monochoria vaginalis, Digitaria sangunalis, Leersia hexandra, Cynodon dactylon etc. The highest weed competitive index was recorded in Aloron (2.27) and the lowest was recorded in Doom (0.42) in the research field. On the other hand, in farmer’s field trial the highest weed competitive index (2.05) was recorded in BRRI dhan48 which was followed by variety Aloron (1.71). The highest grain yield (4.04 t ha-1) was produced by the hybrid variety Aloron which was statistically identical with the variety BRRI dhan48 (3.19 t ha-1) and Iratom-24 (3.06 t ha-1). The hybrid variety Aloron produced the maximum panicle length (24.53 cm) and highest (103.53) grains panicle-1 and lowest (41.87) panicle length was in variety BRRI dhan43. The lowest yield (1.07 t ha-1) was recorded in local cultivar Doom which was at par with BRRI dhan43 (1.32 t ha-1) and local cultivar Kanihati (1.53 t ha-1).

Keywords:

Aus rice, varieties/cultivars, growth, yield, hybrid variety Aloron


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SD Shawon, MN Islam, M Biswas and S Sarker. 2018. COMPETITIVENESS OF AUS RICE VARIETIES AGAINST WEED INFESTATION, Journal of the Sylhet Agricultural University 5(1): 7-14.