title: Effect of Pre-emergence Herbicides on Microbial Biomass and Biochemical Processes in a Typic Fluvaquent Soil Amended with Farm Yard Manure.
abstract: Application of thiobencarb, pendimethalin and pretilachlor at rates of 7.5, 10.0 and 2.5 kg a.i. ha(-1), respectively, under laboratory conditions, significantly increased microbial biomass C, N and P, resulting in greater availability of C, N and P in soil amended with farm yard manure. Application of thiobencarb highly induced microbial biomass C (46.3 %) and N (40.6 %), while pretilachlor and thiobencarb augmented microbial biomass P to the extent of 14.9 % and 14.1 %, respectively. Application of pendimethalin retained the highest amount of total N (19.9 %), soluble NO3 (-) (56 %) and available P (69.5 %) in soil. A similar trend was recorded with thiobencarb for oxidizable organic C (18.1 %) and with pretilachlor for exchangeable NH4 (+) (65.8 %). At the end of the experiment, the highest stimulation of bacteria was recorded with thiobencarb (29.6 %), while pretilachlor harboured the maximum number of actinomycetes (37.2 %) and fungi (40 %) in soil compared to the untreated control.
authors.affiliation: Department of Agricultural Chemistry and Soil Science, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, 741252, West Bengal, India, acdas2@rediffmail.com.
authors.forename: Amal Chandra
authors.initials: AC
authors.lastname: Das
authors.forename: Saurav
authors.initials: S
authors.lastname: Barman
authors.forename: Ritwika
authors.initials: R
authors.lastname: Das
mesh_terms: D000083:Acetanilides / Q000633:toxicity; D000383:Agriculture; D000814:Aniline Compounds / Q000633:toxicity; D001419:Bacteria / Q000187:drug effects; D001669:Biochemical Phenomena / Q000187:drug effects; D018533:Biomass; D002244:Carbon / Q000032:analysis; D005658:Fungi / Q000187:drug effects; D006540:Herbicides / Q000633:toxicity*; D008372:Manure; D009566:Nitrates / Q000032:analysis; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000633:toxicity*; D013859:Thiocarbamates / Q000633:toxicity
chemical_list: D000083:Acetanilides; D000814:Aniline Compounds; D006540:Herbicides; D008372:Manure; D009566:Nitrates; D012987:Soil; D012989:Soil Pollutants; D013859:Thiocarbamates; D010758:Phosphorus; C118050:pretilachlor; D002244:Carbon; C037925:benthiocarb; D009584:Nitrogen; C030856:pendimethalin