title: Influences of Chemical Fertilizers and a Nitrification Inhibitor on Greenhouse Gas Fluxes in a Corn (Zea mays L.) Field in Indonesia.
abstract: The influences of chemical fertilizers and a nitrification inhibitor on greenhouse gas fluxes (N(2)O and CH(4)) in a corn field in Indonesia were investigated using a closed chamber. Plots received 45+45 kg-N ha(-1) of nitrogen fertilizer by split applications of urea, a single application of controlled-release fertilizer (CRF-LP30) or urea+dicyandiamide (DCD; a nitrification inhibitor), and no nitrogen application (control). Cumulative amounts of N(2)O emitted from the field were 1.87, 1.70, 1.06, and 0.42 kg N(2)O-N ha(-1) season(-1) for the urea, CRF-LP30, urea+DCD, and control plots, respectively. The application of urea+DCD reduced the emission of N(2)O by 55.8% compared with urea. On the other hand, the soil acted as a sink for CH(4) in the CRL-LP30, control, and urea+DCD plots with value of -0.09, -0.06 and -0.06 kg CH(4)-C ha(-1) season(-1), respectively. When the viability of AOB (ammonia-oxidizing bacteria) and NOB (nitrite-oxidizing bacteria) were monitored, AOB numbers were correlated with the N(2)O emission. These results suggest that 1) there is a potential for reducing emissions of N(2)O by applying DCD, and 2) corn fields treated with CRF or urea+DCD can act as a sink for CH(4) in a tropical humid climate.
authors.affiliation: Graduate School of Science and Technology, Chiba University.
authors.forename: Oslan
authors.initials: O
authors.lastname: Jumadi
authors.forename: Yusminah
authors.initials: Y
authors.lastname: Hala
authors.forename: Abd
authors.initials: A
authors.lastname: Muis
authors.forename: Alimuddin
authors.initials: A
authors.lastname: Ali
authors.forename: Muhiddin
authors.initials: M
authors.lastname: Palennari
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Yagi
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Inubushi