title: Effect of pendimethalin and quizalofop on N2-fixing bacteria in relation to availability of nitrogen in a Typic Haplustept soil of West Bengal, India.
abstract: An experiment was conducted under laboratory conditions to investigate the effect of two systemic herbicides viz., pendimethalin and quizalofop, at their recommended field rates (1.0 kg and 50 g active ingredient ha(- 1), respectively) on the growth and activities of non-symbiotic N(2)-fixing bacteria in relation to mineralization and availability of nitrogen in a Typic Haplustept soil. Both the herbicides, either singly or in a combination, stimulated the growth and activities of N(2)-fixing bacteria resulting in higher mineralization and availability of nitrogen in soil. The single application of quizalofop increased the proliferation of aerobic non-symbiotic N(2)-fixing bacteria to the highest extent while that of pendimethalin exerted maximum stimulation to their N(2)-fixing capacity in soil. Both the herbicides, either alone or in a combination, did not have any significant difference in the stimulation of total nitrogen content and availability of exchangeable NH(4)(+) while the solubility of NO(3)(-) was highly manifested when the herbicides were applied separately in soil.
authors.affiliation: Department of Agricultural Chemistry and Soil Science, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, 741 252, West Bengal, India. acdas2@rediffmail.com
authors.forename: Amal C
authors.initials: AC
authors.lastname: Das
authors.forename: Hemanta
authors.initials: H
authors.lastname: Nayek
authors.forename: S Devi
authors.initials: SD
authors.lastname: Nongthombam
mesh_terms: D000814:Aniline Compounds / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects* / Q000254:growth & development; D006540:Herbicides / Q000494:pharmacology*; D007194:India; D009584:Nitrogen / Q000378:metabolism*; D009586:Nitrogen Fixation / Q000187:drug effects*; D011422:Propionates / Q000494:pharmacology*; D011810:Quinoxalines / Q000494:pharmacology*; D012988:Soil Microbiology; D012989:Soil Pollutants
chemical_list: D000814:Aniline Compounds; D006540:Herbicides; D011422:Propionates; D011810:Quinoxalines; D012989:Soil Pollutants; C477202:quizalofop; D009584:Nitrogen; C030856:pendimethalin