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Article: Gaseous nitrogen losses from urea applied to maize on a calcareous fluvo-aquic soil in the North China Plain.
- Article from:
- Australian Journal of Soil Research
- Article date:
- September 1, 2002
- Author:
CopyrightCOPYRIGHT 2002 CSIRO Publishing. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Introduction
China accounts for more than one-quarter of the total fertiliser N used in the world (FAO 1998). However, the recovery of fertiliser N by crops is generally low because of gaseous losses from the soil and fertiliser by N[H.sub.3] volatilisation and denitrification (Zhu 1997). This not only results in financial losses to farmers, but also has a detrimental impact on the environment. It is essential to understand the relative importance of each loss process in order to develop effective strategies of N fertiliser management. Such information is also valuable for the development of comprehensive N models to address issues of sustainable agriculture and ...