IN-VITRO EFFECTS OF HERBICIDES ON SOIL MICROBIAL COMMUNITIES

Authors

  • AABID HUSSAIN LONE
  • K. P. RAVERKAR
  • NAVNEET PAREEK

Keywords:

Herbicide, Microbe, Microcosm, Phosphorus solubilizers, Azotobacter

Abstract

Effect of six different herbicides representing four chemical families on soil microbial communities was studied using laboratory microcosm approach. The herbicides tested were isoproturon, metribuzin, clodinafop propargyl, atlantis (Mesosulfuron methyl 3% + Idosulfuron Methyl Sodium 0.6% WG) and sulfosulfuron applied at normal agricultural rates, and UPH-110 (Clodinafop propargyl 12% + Metribuzin 42% WG) tested at four different application rates. Microbial response to the applied herbicides was studied following cultivation dependent approach. The microbial community showed a mixed response towards applied herbicides. With a few exceptions, metribuzin displayed a negative, clodinafop a positive and sulphonylurea herbicides a neutral effect while as the effect of isoproturon was variable. Significant toxic impact of UPH-110 was mostly observed at higher concentrations (@ 600 and 1000 g ha-1). The magnitude of hazard and duration of toxicity increased as the dose of UPH-110 increased. The influence whether positive or negative, was only transitory in nature and recovered to the level of untreated microcosms by or before 30th day of application. Among the microbial groups studied, fungal population was least affected at field rate, bacteria, actinomycetes and Azotobacter showed mixed response while as the phosphorus solubilizers population showed a tendency to increase in response to the applied herbicides.The herbicidal impact on soil microbial population was found to depend on the nature and dose of herbicide used and also the type of microbial group.

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Published

2013-10-19

How to Cite

LONE, A. H., K. P. RAVERKAR, & PAREEK , N. (2013). IN-VITRO EFFECTS OF HERBICIDES ON SOIL MICROBIAL COMMUNITIES. The Bioscan, 9(1), 11–16. Retrieved from https://thebioscan.com/index.php/pub/article/view/620