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Article: Effects of different soil management practices on winter wheat yield and N losses on a dryland loess soil in China.(Report)
- Article from:
- Australian Journal of Soil Research
- Article date:
- August 1, 2008
- Author:
CopyrightCOPYRIGHT 2008 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
Growers in the Loess Plateau usually apply excessive fertiliser as insurance so that N will not limit yields. Fertiliser use increased until the 1990s in the Loess Plateau, and has been maintained since then at annual levels of approximately 150 kg N and 30 kg P/ha for dryland winter wheat (Wang 2006). High N application rates will be one of the reasons for increased crop yield. However, these fertiliser application rates are not necessarily sound from the environmental perspective.
In fact, N use efficiency worldwide has been estimated to be only around 33% for cereal production (Raun and Johnson 1999). The fertiliser use efficiency, ...