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EFFECT OF DIFFERENT DENSITIES OF ECHINOCHLOA COLONUM ON THE GROWTH, DEVELOPMENT AND YIELD OF RICE AND THE WEED UNDER MIXED AND MONOCULTURE (Pages : 11 - 19)
M. AHMED AND S.M.R. KARIMA pot experiment was conducted at the net house to investigate the effect of different densities of Echinochloa coloumn on rice (cv. BRRI dhan32). Five weed densities such as 2, 3, 4, 5 and 6 weeds/pot were grown in pure stands and in mixture with rice. Monoculture of rice was also maintained. All the plant characters except 1000-grain weight of rice were reduced due to competition from E. coloumn. The plant characters were decreased progressively with the increase in density. Grain yield was reduced by 89.9% when 6 weeds/pot were competed with single rice plant. The effect of weed density on the grain yield of rice was represented by a rectangular hyperbola. The effect of weed density produced significant reduction in plant characters of the weed both in pure stands and in mixture with rice. When the intra-weed competition and inter-weed competition combined the degree of reduction in plant characters of weed increased further. In the case of weed, total dry matter/plant and seed yield/plant, both in monoculture and mixed culture showed negative linear regression with weed density. The total dry matter/pot and seed yield /pot increased linearly with the increase in weed density. Production of sub-branches of the weed was also reduced linearly with the increase in weed density both in monoculture and in mixture with rice. E. colonum is a notorious weed in rice production causing severe yield reduction even under low population density. Therefore, it should be controlled properly from the rice fields before it did the detrimental effects to rice growth. Download