Nitrous oxide emissions from vegetables grown in a polytunnel treated with high rates of applied nitrogen fertilizers in Southern China

A - Papers appearing in refereed journals

Min, J., Shi, W., Xing, G., Powlson, D. S. and Zhu, Z. 2012. Nitrous oxide emissions from vegetables grown in a polytunnel treated with high rates of applied nitrogen fertilizers in Southern China. Soil Use and Management. 28 (1), pp. 70-77.

AuthorsMin, J., Shi, W., Xing, G., Powlson, D. S. and Zhu, Z.
Abstract

Soils under intensive agricultural practices such as those for growing vegetables in plastic greenhouses are an important anthropogenic source of nitrous oxide (N2O). Nitrous oxide emissions and measures to mitigate them through fertilizer N management have been less frequently studied than open field systems. The objectives of this study were to measure N2O emissions from vegetables under greenhouse conditions in Southern China and to investigate the effect of reducing the amount of applied synthetic N fertilizer compared with local practice. Results indicate that the average N2O-N flux during the growth of four vegetables (tomato, cucumber, celery and a second tomato crop) was 117.4 +/- 9 mu g N/m2/h, and the annual emission rate was 8.1 +/- 0.6 kg/N/ha for local farms. Temperature was important with much lower emissions during the celery-growing season when soil and air temperatures were frequently <10 degrees C. Nitrous oxide emissions from the greenhouse vegetables were seven times greater than from the ricewheat system in the same area and soils. Reducing the amount of applied synthetic N fertilizer by 40% relative to local farmers normal usage could reduce annual cumulative N2O emissions by 33% without any impact on crop yields.

KeywordsSoil Science
Year of Publication2012
JournalSoil Use and Management
Journal citation28 (1), pp. 70-77
Digital Object Identifier (DOI)doi:10.1111/j.1475-2743.2011.00377.x
Open accessPublished as non-open access
FunderNSFC
Special Program on Control and Management of Water Pollution
National Basic Research Program of China
Funder project or codeSEF
Centre for Biofuels and Climate Change (BCC)
PublisherWiley
ISSN0266-0032

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