Effect of paraquat and glyphosate on biodiversity of soil invertebrate fauna at the teaching and research farm Obafemi Awolowo University, Ile-Ife

dc.contributor.authorBabatope, Eyitayo Itunu
dc.date.accessioned2019-11-06T07:52:44Z
dc.date.available2019-11-06T07:52:44Z
dc.date.issued2014
dc.descriptionxi, 86pen_US
dc.description.abstractThis study investigated the effect of glyphosate and paraquat on soil invertebrate fauna biodiversity, soil physico-chemical properties and the relationship between them with a view to determining the ecological effects of chemicals on the environment. An experimental field of 19 m by 11 m was mapped out at the Teaching and Research Farm of Obafemi Awolowo University, Ile-Ife, for the study. Plots of 4 m by 3 m separated by 1 m were laid out in completely randomized design with three treatments and four replications. The treatments were cowpea + glyphosate (CG), cowpea + paraquat (CP) and cowpea + water (CW) as control. Herbicides were applied at the manufacturer’s recommended rates of 4 l/h for glyphosate and 2 l/h for paraquat. Soil invertebrates’ fauna were collected pre- and post-application of herbicides as follows: 14, 7 days before application (DBA); 7, 14, 30, 60, 90 and 120 days after application (DAA) using pitfall trap with 4% formalin and a modified Berlese-Tulgren extractor. Earthworms were sampled by taking and examining a soil core of 20 (l) x 20 (w) x 20 (d) cm per plot. Sub-samples of each core was taken and analysed for physico-chemical properties in the laboratory using standard procedures. Data obtained were analysed using analysis of variance (ANOVA) and Pearson correlation coefficients. Seven types of soil invertebrate fauna were identified. These were Collembola, Acarina, Formicidae, Aranae, Isoptera, Coleoptera, Diplopoda and Oligocheata. Collembola was the most abundant invertebrate fauna (59.1 %) collected while Oligocheata was the least abundant (0.18%). The population of all the invertebrate fauna was reduced by the application of both glyphosate and paraquat. However, the population grew gradually from 14 DAA for Collembola, Aranae and Isoptera, 30 DAA for Formicidae, Diplopoda, and Acarina, attaining peaks at 60 DAA. The Shannon-Weiner index for glyphosate, paraquat and control were 1.30, 1.50 and 1.54 respectively. Pearson’s correlation coefficient revealed a positive significant relationship at p < 0.05 between soil moisture content, Aranae, Diplopoda, Collembolla, and at p < 0.01 with Acarina. Sodium ion and calcium ion were positively correlated (p < 0.01) with Aranae and Diplopoda while Isoptera only showed significant (p < 0.01) positive correlation with calcium ion. Organic matter was positively correlated (p < 0.05) with Aranae, Collembola and Diplopoda (p < 0.01). Phosphorus showed positive significant correlation at p < 0.01 with Formicidae Aranae, and at p < 0.05 with Isoptera and Collembola. In contrast, soil temperature and soil pH showed significant (p < 0.05) negative correlation with Collembola. Values of most physico-chemical properties did not vary significantly between the treatment and control plots except sodium ion which significantly (P < 0.05) increased in paraquat treated plots. This study concluded that application of glyphosate and paraquat reduced the population of most soil invertebrate fauna.en_US
dc.identifier.citationBabatope, E.I. (20014). Effect of paraquat and glyphosate on biodiversity of soil invertebrate fauna at the teaching and research farm Obafemi Awolowo University, Ile-Ife. Obafemi Awolowo Universityen_US
dc.identifier.urihttps://ir.oauife.edu.ng/handle/123456789/5014
dc.language.isoenen_US
dc.publisherObafemi Awolowo Universityen_US
dc.subjectBiodiversity of soil invertebrate faunaen_US
dc.subjectEffect of paraquaten_US
dc.subjectGlyphosateen_US
dc.subjectBiodiversityen_US
dc.subjectParaquaten_US
dc.subjectBiodiversityen_US
dc.subjectInvertebrate faunaen_US
dc.titleEffect of paraquat and glyphosate on biodiversity of soil invertebrate fauna at the teaching and research farm Obafemi Awolowo University, Ile-Ifeen_US
dc.typeThesisen_US
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