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DETERMINATION OF GROWTH AND DEVELOPMENT OF BARNYARDGRASS (Echinochloa crus-galli L. Beauv) UNDER DIFFERENT ALLELOPATHIC EFFECT OF RICE VARIETY (Pages : 11 - 15)

R. KHATUN, S.M.R. KARIM, M.S. ISLAM AND F. ZAMAN

An experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from 29 March, 2011 to 17 May, 2011 to determine the growth and development of barnyardgrass (Echinochloa crus-galli L. Beauv.) under different allelopathic effect of rice variety. Two planting systems viz. (a) Monoculture of barnyardgrass (b) Rice-branyardgrassmixculture; two level of nitrogen viz. (a) Optimum nitrogen dose (70 kg/ha) (b) No nitrogenand five varieties of rice viz. V1 = BR 3 (Biplob), V2 = BR 21 (Niamat), V3 = BR 24 (Rahmat), V4 = BRRI dhan27 and V5 = BRRI dhan47 were included as experimental treatment. The experiment was laid out in a randomized complete block design with three replications. In fields barnyardgrass was grown mixed with allelopathic rice and decreased its the allelopathic effect of rice on the growth and development of barnyardgrass (Echinochloa crus-galli L. Beauv.) number of tillers plant-1, total dry weight (g) significantly except height due to the competitive nature of barnyardgrass. This reduction might be due to allelopathic effect of rice on barnyardgrass. Level of nitrogen had significant effect of plant height, number of tillers plant-1 and seedling emergence at all sampling dates, except height at 50 DAS. The value of each of these parameters was the highest at the optimum level of nitrogen (35 g plot-1) and the lowest at the lowest level of nitrogen (0 kg ha-1). At any level of nitrogen, plant height, numbers of tillers plant-1 of barnyardgrass at any growth stage were shorter in mix-culture than in monoculture. This means that at any level of nitrogen, rice plants exerted its allelopathic effect on barnyardgrass of any growth stage in field. In field conditions, except height number of tillers plant-1, total dry weight plant-1 of barnyardgrass at all sampling dates and seedling emergence (at 2 and 7 DAS) of barnyardgrass decreased significantly when it was grown mixed with rice. This reductionDownload


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