Agriculture Reference
In-Depth Information
Howarth, R. W., G. Billen, D. Swaney, A. Townsend, N. Jaworski, K. Lajtha, J. A. Downing,
R. Elmgren, N. Caraco, T. Jordan, F. Berendse, J. Freney, V. Kudeyarov, P. Murdoch,
and Z. L. Zhu. 1996. Regional nitrogen budgets and riverine N&P fluxes for the drain-
ages to the North Atlantic Ocean: natural and human influences. Biogeochemistry
35:75-139.
IFA (International Fertilizer Industry Association). 2011. IFADATA statistics. Paris, France.
Inwood, S. E., J. L. Tank, and M. J. Bernot. 2005. Patterns of denitrification associated
with land use in 9 midwestern headwater streams. Journal of the North American
Benthological Society 24:227-245.
IPCC (Intergovernmental Panel on Climate Change). 2006. 2006 IPCC guidelines for
national greenhouse gas inventories. National Greenhouse Gas Inventories Programme,
Institute for Global Environmental Strategies (IGES), Hayama, Japan.
IPNI (International Plant Nutrition Institute). 2012. 4R plant nutrition: a manual for improv-
ing the management of plant nutrition. T.W. Bruulsema, P. E. Fixen, and G. D. Sulewski,
editors. IPNI, Norcross, Georgia, USA.
ISU (Iowa State University). 2004. Corn nitrogen rate calculator: a regional (Corn Belt)
approach to nitrogen rate guidelines. Iowa State University Agronomy Extension,
Ames, Iowa, USA. <
http://extension.agron.iastate.edu/soilfertility/nrate.aspx
>
Jaworski, N. A., R. W. Howarth, and L. J. Hetling. 1997. Atmospheric deposition of nitrogen
oxides onto the landscape contributes to coastal eutrophication in the northeast United
States. Environmental Science & Technology 31:1995-2004.
Jaynes, D. B., J. L. Hatfield, and D. W. Meek. 1999. Water quality in Walnut Creek Watershed:
herbicides and nitrate in surface waters. Journal of Environmental Quality 28:45-59.
Kramer, D. A. 2004. Nitrogen. Pages 53.1-53.18 in Minerals yearbook, Metals and minerals
2004, Vol. 1, U.S. Geological Survey, Washington, DC, USA.
Kravchenko, A. N., and D. G. Bullock. 2000. Correlation of corn and soybean grain yield
with topography and soil properties. Agronomy Journal 92:75-83.
Kravchenko, A. N., and G. P. Robertson. 2007. Can topographical and yield data substantially
improve total soil carbon mapping by regression kriging? Agronomy Journal 99:12-17.
Kravchenko, A. N., G. P. Robertson, X. Hao, and D. G. Bullock. 2006. Management prac-
tice effects on surface total carbon: difference in spatial variability patterns. Agronomy
Journal 98:1559-1568.
Lal, R. 2004. Soil carbon sequestration to mitigate climate change. Geoderma 123:1-22.
Leigh, G. J. 2004. The world's greatest ix: a history of nitrogen and agriculture. Oxford
University Press, New York, New York, USA.
Li, F., Y. Miao, F. Zhang, Z. Cui, R. Li, X. Chen, H. Zhang, J. Schroder, W. R. Raun, and
L. Jia. 2009. In-season optical sensing improves nitrogen-use efficiency for winter
wheat. Soil Science Society of America Journal 73:1566-1574.
Liebig, J. 1840. Chemistry in its application to agriculture and physiology. Taylor & Walton,
London, UK.
Liebman, M., M. J. Helmers, L. A. Schulte, and C. A. Chase. 2013. Using biodiversity to link
agricultural productivity with environmental quality: results from three field experi-
ments in Iowa. Renewable Agriculture and Food Systems 28:115-128.
Liu, X. J., A. R. Mosier, A. D. Halvorson, and F. S. Zhang. 2006. The impact of nitrogen
placement and tillage on NO, N
2
O, CH
4
and CO
2
fluxes from a clay loam soil. Plant and
Soil 280:177-188.
Loecke, T. D., and G. P. Robertson. 2009. Soil resource heterogeneity in the form of aggre-
gated litter alters maize productivity. Plant and Soil 325:231-241.
