33. Effect of leaf aqueous extracts of acacia, brassica, eucalyptus and sorghum on germination and growth of Avena fatua L. and Phalaris minor Retz.

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Muhammad Ayaz Shahzad, Rana Muhammad Ikram, Muhammad Aslam, Muhammad Roman, Jaffar Iqbal, Ali Raza Shah


The aggrieving unhealthy consequences of manmade chemicals towards environment have left no option for researchers to detect and develop the weed suppressant which may be more close to nature. Nature has bestowed the plants with inhibitory chemicals, name as “allelochemicals”, acknowledged to deter the nourishment of nearby organisms. So, keeping the environmental hazards of herbicides in view to save the environment, the present study is designed to observe the allelopathic effect of plant species, i.e. Acacia nilotica L., Brassica napus L., Eucalyptus camaldulensis L. and Sorghum bicolor L. against narrow leaf weeds i.e. Avena fatua L. and Phalaris minor Retz. of winter season in Pakistan. Different concentrations (1%, 2%, 3%, 4% and 5%) of above mentioned allelopathic plant species were tested in the form of aqueous leaf extracts for germination and seedling growth along with its related attributes of the weeds, in laboratory conditions in Completely Randomized Design (CRD). Result revealed that except 1% of A. nilotica L., leaf aqueous extracts of B. napus L., E. camaldulensis L. and S. bicolor L. affected the germination and related attributes at significant level. Maximum obstruction towards Avena fatua L. and Phalaris minor Retz. was noted in case of 5% of B. napus L. along with S. bicolor L., those inhibited the germination and seedling development of the weed completely.

Keywords: Acacia; Allelopathy; Brassica; Eucalyptus; Little seed canary grass; Sorghum; Wild oat


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