HERBICIDAL EFFECT ON SOIL MICROCOSM, NODULATION, NITROGEN AND YIELD IN CHICKPEA (Cicer arietinum L.)

K.S. RAGHAVENDRA¹*, R.C. GUNDAPPAGOL^2
1Department of Agril Microbiology, University of Agricultural Sciences, UAS Campus, Raichur, 584 104, Karnataka, India
²Agricultural Research Station, Kalaburagi, 585104, University of Agricultural Sciences, UAS Campus, Raichur, 584 104, Karnataka, India
* Corresponding Author : raghavendra4648@gmail.com

Received : 19-08-2017     Accepted : 21-11-2017     Published : 28-11-2017
Volume : 9     Issue : 11       Pages : 5 - 10
Int J Microbiol Res 9.11 (2017):5-10

Keywords : Herbicides, soil microcosm, Rhizobium, Nodulation, chickpea
Academic Editor : Manoj Choudhary, Sapna Singh
Conflict of Interest : None declared
Acknowledgements/Funding : Author are thankful to University of Agricultural Sciences, Raichur, Karnataka 585401
Author Contribution : All author equally contributed

Herbicides are commonly used in kalaburagi to control weeds in chickpea. In addition to their impact on weeds, these herbicides are also affecting soil microorganisms which are responsible for numerous biological processes essential for crop production. In the present study, we assessed the impact of five commonly used herbicides three are pre emergence and two are post emergence [Pendimethalin (PRE), Chlormuron ethyl (PRE), Oxyfluorfen (PRE), Quizalofop ethyl (POE) and Phenaxoprop ethyl (POE)] on soil microbial populations in chickpea cultivation experimental plots. Our study showed that the herbicide treatments sinhibited the development of microbial populations in the soil, and the degree of inhibition closely related to the mode application as pre emergence or post emergence and varied with the types of herbicide. Weed free check recorded the highest number of microorganisms at all the different growth stages and differed in herbicides treated plots. Among the pre emergence pendimethalin recorded highest and in post emergence herbicides phenaxoprop ethyl resulted more in different stages of chickpea sampling. The study suggests that the herbicide application to soil of chickpea cultivation cause transient impacts on microbial population growth, when applied at recommended field application rate.

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