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ABSTRACT
This study was carried out to determine the effects of different rates of application of herbicides (2,4-Dichlorophenoxyacetic acid) on fungi population of soil (Ultisol). Soil samples were obtained with the aid of an auger from a soil depth of 0-15cm from the experimental field of Faculty of Agriculture, University of Benin, Benin-city. The soil samples were bulked and fed into experimental pots (15kg) that were thereafter laid out in a completely randomized design (CRD) based on the treatments (0L -ha , 2L -ha , 3L -ha and 6L -ha respectively). Results showed that the pH of the soil was strongly acidic (5.0), it had low organic carbon (2.04gkg -1) which also resulted in low microbial activities in the soil. Herbicide treatment of 3L -ha (1.5 recommended rate) had the highest population of fungi (3.91 cfug -1 of soil) while the rates above recommendation had a reduced population in the fungi count after four weeks of experiment compared with the control and ideal recommended application. Generally, the application of the herbicides resulted in the complete elimination of Trichoderma sp while Aspergillus niger, Clasdosporium sp, Penicillium sp, Mucor mucedo and Rhodotorula sp, were resistant to the effects.
