Agriculture Reference
In-Depth Information
Robertson, G.  P., D. A.  Wedin, P. M.  Groffman, J. M.  Blair, E. Holland, D. Harris, and
K. Nadelhoffer. 1999. Soil carbon and nitrogen availability:  nitrogen mineraliza-
tion, nitrification, and soil respiration potentials. Pages 258-271 in G. P.  Robertson,
C. S.  Bledsoe, D. C.  Coleman, and P. Sollins, editors. Standard soil methods for
long-term ecological research. Oxford University Press, New York, USA.
Royer, T. V., M. B. David, and L. E. Gentry. 2006. Timing of riverine export of nitrate and
phosphorus from agricultural watersheds in Illinois: implications for reducing nutrient
loading to the Mississippi River. Environmental Science & Technology 40:4126-4131.
Ruschel, A. P., P. B. Vose, R. L. Victoria, and E. Salati. 1979. Comparison of isotope tech-
niques and non-nodulating isolines to study the effect of ammonium fertilization on
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Salvagiotti, F., K. G.  Cassman, J. E.  Specht, D. T.  Walters, and A. Dobermann. 2008.
Nitrogen uptake, fixation and response to fertilizer N in soybeans: a review. Field Crops
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Sánchez, J. E., T. C. Willson, K. Kizilkaya, E. Parker, and R. R. Harwood. 2001. Enhancing
the mineralizable nitrogen pool through substrate diversity in long term cropping sys-
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Sawyer, J. E., E. D. Nafziger, G. W. Randall, L. G. Bundy, G. W. Rehm, and B. C. Joern.
2006. Concepts and rationale for regional nitrogen rate guidelines for corn. Iowa State
University Extension Publication PM2015, Ames, Iowa, USA.
Scharf, P. C., N. R. Kitchen, K. A. Sudduth, J. G. Davis, V. C. Hubbard, and J. A. Lory. 2005.
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97:452-461.
Scharf, P. C., and J. A. Lory. 2009. Calibrating reflectance measurements to predict optimal
sidedress nitrogen rate for corn. Agronomy Journal 101:615.
Schipanski, M. E., and L. E. Drinkwater. 2011. Nitrogen fixation of red clover interseeded
with winter cereals across a management-induced fertility gradient. Nutrient Cycling in
Agroecosystems 90:105-119.
Schmidt, T. M., and C. Waldron. 2015. Microbial diversity in agricultural soils and its rela-
tion to ecosystem function. Pages 135-157 in S. K. Hamilton, J. E. Doll, and G. P.
Robertson, editors. The ecology of agricultural ecosystems: long-term research on the
path to sustainability. Oxford University Press, New York, New York, USA.
Senthilkumar, S., A. N.  Kravchenko, and G. P.  Robertson. 2009. Topography influences
management system effects on total soil carbon and nitrogen. Soil Science Society of
America Journal 73:2059-2067.
Sexstone, A. J., N. P. Revsbech, T. P. Parkin, and J. M. Tiedje. 1985. Direct measurement
of oxygen profiles and denitrification rates in soil aggregates. Soil Science Society of
America Journal 49:645-651.
Sey, B. K., J. K. Whalen, E. G. Gregorich, P. Rochette, and R. I. Cue. 2008. Carbon dioxide
and nitrous oxide content in soils under corn and soybean. Soil Science Society of
America Journal 72:931-938.
Shcherbak, I., N. Millar, and G. P. Robertson. 2014. A global meta-analysis of the nonlinear
response of soil nitrous oxide (N 2 O) to fertilizer nitrogen. Proceedings of the National
Academy of Sciences USA 111:9199-9204.
Smil, V. 2002. Nitrogen and food production: proteins for human diets. Ambio 31:126-131.
Smith, K. A., and K. E. Dobbie. 2001. The impact of sampling frequency and sampling
times on chamber-based measurements of N 2 O emissions from fertilized soils. Global
Change Biology 7:933-945.
Smith, R. G., F. D. Menalled, and G. P. Robertson. 2007. Temporal yield variability under
conventional and alternative management systems. Agronomy Journal 99:1629-1634.
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