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Fertilizer induced nitrous oxide emissions from Vertisols and Alfisols during sweet sorghum cultivation in the Indian semi-arid tropics

Author:
Ramu, Karri, Watanabe, Takeshi, Uchino, Hiroshi, Sahrawat, Kanwar L., Wani, Suhas P., Ito, Osamu
Source:
The Science of the total environment 2012 v.438 pp. 9-14
ISSN:
0048-9697
Subject:
Alfisols, Vertisols, agroecological zones, cropping systems, emissions, fertilizer application, greenhouse gases, nitrogen fertilizers, nitrous oxide, rain, soil properties, sweet sorghum, tropics, wet season
Abstract:
Nitrous oxide (N₂O) 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 90kg/ha and a control without N fertilizer application. The N₂O emissions strongly coincided with N fertilization and rainfall events. The cumulative N₂O–N emission from Alfisols was 1.81N₂O–Nkg/ha for 90 N treatment and 0.15 N₂O–Nkg/ha for the 0 N treatment. Similarly, the N₂O–N emission from Vertisols was 0.70 N₂O–Nkg/ha for 90 N treatment and 0.09 N₂O–Nkg/ha for the 0 N treatment. The mean N₂O–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 N₂O emissions are dependent on the soil properties. Therefore, the monitoring of N₂O 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.
Agid:
570232