Details

Autor(en) / Beteiligte

• MOHANTY, S. R
• BHARATI, K
• MOORTHY, B. T. S
• RAMAKRISHNAN, B
• RAO, V. R
• SETHUNATHAN, N
• ADHYA, T. K

Titel

Effect of the herbicide butachlor on methane emission and ebullition flux from a direct-seeded flooded rice field

Ist Teil von

• Biology and fertility of soils, 2001-03, Vol.33 (3), p.175-180

Ort / Verlag

Berlin: Springer

Erscheinungsjahr

2001

Quelle

SpringerLINK Contemporary (Konsortium Baden-Württemberg)

Beschreibungen/Notizen

• Application of a commercial formulation of the herbicide butachlor (N-butoxymethyl-2-chloro-2',6'-diethyl acetanilide) at 1 kg a.i. ha super(-1) to an alluvial soil planted with direct-seeded flooded rice (cv. Annada), significantly inhibited both crop-mediated emission and ebullition fluxes of methane (CH sub(4)). Over a cropping period of 110 days, the crop-mediated cumulative emission flux of CH sub(4) was lowered by \sim20% in butachlor-treated field plots compared with that of an untreated control. Concurrently, ebollition flux of CH sub(4) was also retarded in butachlor-treated field plots by about 81% compared with that of control plots. Significant relationships existed between CH sub(4) emission and redox potential (E sub(h)) and Fe super(2+) content of the flooded soil. Application of butachlor retarded a drop in soil redox potential as well as accumulation of Fe super(2+) in treated field plots. Methanogenic bacterial population, counted at the maturity stage of the crop, was also low in butachlor-treated plots, indicating both direct and indirect inhibitory effects of butachlor on methanogenic bacterial populations and their activity. Results indicate that butachlor, even at field-application level, can effectively abate CH sub(4) emission and ebollition from flooded soils planted to rice whilst maintaining grain yield.