Imidacloprid application changes microbial dynamics and enzymes in rice soil
| Autor: | Bibhab Mahapatra, Sushmita Munda, Totan Adak, Periyasamy Panneerselvam, Upendra Kumar, Naveen K. B. Patil, N.N. Jambhulkar, Guru P. Pandi G, Manoj Kumar Yadav, Mayabini Jena, G. Basana Gowda |
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| Rok vydání: | 2017 |
| Předmět: |
Insecticides
Time Factors Urease Health Toxicology and Mutagenesis Microorganism Microbial Consortia Population 010501 environmental sciences 01 natural sciences Toxicology Neonicotinoids Soil chemistry.chemical_compound Imidacloprid parasitic diseases Soil Pollutants Ecosystem education Soil Microbiology 0105 earth and related environmental sciences Tropical Climate education.field_of_study Dose-Response Relationship Drug biology Public Health Environmental and Occupational Health Acid phosphatase Oryza 04 agricultural and veterinary sciences General Medicine Nitro Compounds Phosphate biology.organism_classification Pollution Carbon Agronomy chemistry 040103 agronomy & agriculture biology.protein 0401 agriculture forestry and fisheries Bacteria |
| Zdroj: | Ecotoxicology and Environmental Safety. 144:123-130 |
| ISSN: | 0147-6513 |
| DOI: | 10.1016/j.ecoenv.2017.06.013 |
| Popis: | Extensive use of imidacloprid in rice ecosystem may alter dynamics of microorganisms and can change soil biochemical properties. The objective of this study was to assess the effect of imidacloprid on growth and activities of microbes in tropical rice soil ecosystem. Four treatments, namely, recommended dose (at 25 g a.i. ha −1 , RD), double the recommended dose (at 50 g a.i. ha −1 , 2RD), five times the recommended dose (at 125 g a.i. ha −1 , 5RD) & ten times the recommended dose (at 250 g a.i. ha −1 , 10RD) along with control were imposed under controlled condition. Dissipation half lives of imidacloprid in soil were 19.25, 20.38, 21.65 and 33.00 days for RD, 2RD, 5RD and 10RD, respectively. In general bacteria, actinomycetes, fungi and phosphate solubilising bacteria population were disturbed due to imidacloprid application. Changes in diversity indices within bacterial community confirmed that imidacloprid application significantly affected distribution of bacteria. Total soil microbial biomass carbon content was reduced on imidacloprid application. Except dehydrogenase and alkaline phosphatase activities, all other soil enzymes namely, β-glycosidase, fluorescien diacetate hydrolase, acid phosphatase and urease responded negatively to imidacloprid application. The extent of negative effect of imidacloprid depends on dose and exposure time. This study concludes imidacloprid application had transient negative effects on soil microbes. |
| Databáze: | OpenAIRE |
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