References
- Freeman, K. W., K. Girma, D. B. Arnall, R. W. Mullen, K. L. Martin, R. K. Teal, and W. R. Raun. 2007. By-plant prediction of corn forage biomass and nitrogen uptake at various growth stages using remote sensing and plant height. Agronomy Journal 99 (2): 530–36. doi:10.2134/agronj2006.0135
- Hager, A. 2010. Corn growth stages and postemergence herbicides. Bulletin (7). http://bulletin.ipm.illinois.edu/article.php?id=1317 (accessed January 8, 2013).
- Johnson, G. V., and W. R. Raun. 2003. Nitrogen response index as a guide to fertilizer management. Journal of Plant Nutrition 26 (2): 249–62. doi:10.1081/PLN-120017134
- Jones, R. M., M. A. Sanderson, J. C. Read, and A. C. Lovell. 1995. Management of corn for silage production in south central USA. Journal of Production Agriculture 8 (2): 175–80. doi:10.2134/jpa1995.0175
- Malakoff, D. 1998. Death by suffocation in the Gulf of Mexico. Science (Washington) 281 (5374): 190–92. doi:10.1126/science.281.5374.190
- Martin, K. L., K. Girma, K. W. Freeman, R. K. Teal, B. Tubańa, D. B. Arnall, B. Chung, O. Walsh, J. B. Solie, M. L. Stone, and W. R. Raun. 2007. Expression of variability in corn as influenced by growth stage using optical sensor measurements. Agronomy Journal 99 (2): 384–89. doi:10.2134/agronj2005.0268
- Martin, K. L., P. J. Hodgen, K. W. Freeman, R. Melchiori, D. B. Arnall, R. K. Teal, R. W. Mullen, K. Desta, S. B. Phillips, and J. B. Solie. 2005. Plant-to-plant variability in corn production. Agronomy Journal 97 (6): 1603–11. doi:10.2134/agronj2005.0129
- Pordesimo, L. O., W. C. Edens, and S. Sokhansanj. 2004. Distribution of aboveground biomass in corn stover. Biomass and Bioenergy 26 (4): 337–43. doi:10.1016/S0961-9534(03)00124-7
- Raun, W. R., and G. V. Johnson. 1999. Improving nitrogen use efficiency for cereal production. Agronomy Journal 91 (3): 357–63. doi:10.2134/agronj1999.00021962009100030001x
- Raun, W. R., G. V. Johnson, H. L. Lees, H. Sembiring, S. B. Phillips, J. B. Solie, M. L. Stone, and R. W. Whitney. 1998. Microvariability in soil test, plant nutrient, and yield parameters in bermudagrass. Soil Science Society of America Journal 62 (3): 683–90. doi:10.2136/sssaj1998.03615995006200030020x
- Raun, W. R., J. B. Solie, K. L. Martin, K. W. Freeman, M. L. Stone, G. V. Johnson, and R. W. Mullen. 2005. Growth stage, development, and spatial variability in corn evaluated using optical sensor readings. Journal of Plant Nutrition 28 (1): 173–82. doi:10.1081/PLN-200042277
- Ritchie, S. W., J. J. Hanway, and G. O. Benson. 1996. How a corn plant develops. Ames: Iowa State University, Cooperative Extension Service.
- SAS Institute. 2003. The SAS system for Windows, version 9.2. Cary, NC: SAS Institute.
- Searcy, S. W. 1997. Precision farming: A new approach to crop management (Texas Agricultural Extension Service Publication L-5177). College Station, TX: The Texas A & M University System.
- Shaw, R. H., and W. E. Loomis. 1950. Bases for the prediction of corn yields. Plant Physiology 25 (2): 225–44. doi:10.1104/pp.25.2.225
- Solie, J. B., W. R. Raun, and M. L. Stone. 1999. Submeter spatial variability of selected soil and bermudagrass production variables. Soil Science Society of America Journal 63 (6): 1724–33. doi:10.2136/sssaj1999.6361724x
- Solie, J. B., W. R. Raun, R. W. Whitney, M. L. Stone, and J. D. Ringer. 1996. Optical-sensor-based field element size and sensing strategy for nitrogen application. Transactions of the ASAE 39 (6): 1983–92. doi:10.13031/2013.27700
- Sorensen, R. B., M. C. Lamb, and C. L. Butts. 2006. Row, pattern, plant density, and nitrogen rate on corn yield in the southeastern US. Online. Crop Management. doi:10.1094/CM-2006-1211-01-RS
- Teal, R. K., W. R. Raun, J. B. Solie, M. L. Stone, K. W. Freeman, G. V. Johnson, and K. L. Martin. 2004. By-plant precision sensing for variable nitrogen rate application in corn. In Proceedings of the 7th International Precision Agriculture Conference, July 26–28, 2004, Minneapolis, MN. Madison, WI: ASA/CSSA/SSSA.
- Tubaña, B. S., D. B. Arnall, S. L. Holtz, J. B. Solie, K. Girma, and W. R. Raun. 2008. Effect of treating field spatial variability in winter wheat at different resolutions. Journal of Plant Nutrition 31 (11): 1975–98. doi:10.1080/01904160802403144
- US Department of Agriculture Economic Research Service. 2013. Fertilizer use and price. http://www.ers.usda.gov/data-products/fertilizer-use-and-price.aspx - 26727 (accessed January 10, 2013).