How much fertilizer is too much for Earth's climate?
"Because nitrous oxide emissions won't be accelerated by fertilizers until crops' nitrogen needs are met, more nitrogen fertilizer can be added to under-fertilized crops without much affecting emissions," says Shcherbak.
Adding less nitrogen to over-fertilized crops elsewhere, however, would deliver major reductions to greenhouse gas emissions in those regions.
The study provides support for expanding the use of carbon credits to pay farmers for better fertilizer management and offers a framework for using this credit system around the world.
Carbon credits for fertilizer management are now available to U.S. corn farmers, says Robertson.
The research was also funded by MSU, the U.S. Department of Energy's Great Lakes Bioenergy Research Center and the Electric Power Research Institute.
|--||Cheryl Dybas, NSF (703) 292-7734 firstname.lastname@example.org|
|--||Layne Cameron, MSU (517) 353-8819 email@example.com|
G. Philip Robertson
Michigan State University
Long-Term Ecological Research
NSF Kellogg Biological Station Long-Term Ecological Research (LTER) Site: http://lter.kbs.msu.edu/
NSF Long-Term Ecological Research (LTER) Network: http://www.lternet.edu
NSF News: Scientists Develop New Carbon Accounting Method to Reduce Farmers' Use of Nitrogen Fertilizer: http://www.nsf.gov/news/news_summ.jsp?cntn_id=123848
NSF News: Marginal Lands Are Prime Fuel Source for Alternative Energy: http://www.nsf.gov/news/news_summ.jsp?cntn_id=126498
NSF Publication: Discoveries in Long-Term Ecological Research: http://www.nsf.gov/pubs/2013/nsf13083/nsf13083.pdf
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