title: Fertilizer induced nitrous oxide emissions from Vertisols and Alfisols during sweet sorghum cultivation in the Indian semi-arid tropics.
abstract: Nitrous oxide (N(2)O) emissions from Vertisols and Alfisols during sweet sorghum cultivation in the Indian semi-arid tropics were determined using a closed chamber technique during the rainy season (June-October) of 2010. The study included two treatments, nitrogen (N) at a rate of 90 kg/ha and a control without N fertilizer application. The N(2)O emissions strongly coincided with N fertilization and rainfall events. The cumulative N(2)O-N emission from Alfisols was 1.81 N(2)O-N kg/ha for 90 N treatment and 0.15 N(2)O-N kg/ha for the 0 N treatment. Similarly, the N(2)O-N emission from Vertisols was 0.70 N(2)O-N kg/ha for 90 N treatment and 0.09 N(2)O-N kg/ha for the 0 N treatment. The mean N(2)O-N emission factor for fertilizer induced emissions from the Alfisols was 0.90% as compared to 0.32% for Vertisols. Our results suggest that the N(2)O emissions are dependent on the soil properties. Therefore, the monitoring of N(2)O emissions from different agro-ecological regions, having different soil types, rainfall characteristics, cropping systems and crop management practices are necessary to develop comprehensive and accurate green house gas inventories.
authors.affiliation: International Crops Research Institute for Semi-Arid Tropics, Patancheru, Andhra Pradesh, India. r.karri@cgiar.org
authors.forename: Karri
authors.initials: K
authors.lastname: Ramu
authors.forename: Takeshi
authors.initials: T
authors.lastname: Watanabe
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Uchino
authors.forename: Kanwar L
authors.initials: KL
authors.lastname: Sahrawat
authors.forename: Suhas P
authors.initials: SP
authors.lastname: Wani
authors.forename: Osamu
authors.initials: O
authors.lastname: Ito
mesh_terms: D000383:Agriculture / Q000379:methods; D000393:Air Pollutants / Q000032:analysis*; D000704:Analysis of Variance; D002849:Chromatography, Gas; D005308:Fertilizers / Q000009:adverse effects* / Q000032:analysis; D007194:India; D009609:Nitrous Oxide / Q000032:analysis*; D010316:Particle Size; D011891:Rain; D012621:Seasons; D012987:Soil / Q000032:analysis*; D045868:Sorghum / Q000254:growth & development*; D014329:Tropical Climate
chemical_list: D000393:Air Pollutants; D005308:Fertilizers; D012987:Soil; D009609:Nitrous Oxide