Soybean

Yield Gains in Major U.S. Field Crops

Volumn , Issue , 2015, Pages 311-355

  Specht, James E ^a   Diers, Brian W ^b   Nelson, Randall L ^c   de Toledo, Jose Francisco Ferraz ^d   Torrion, Jessica A ^e   Grassini, Patricio ^a  

^a UNIVERSITY OF NEBRASKA LINCOLN   (United States)

^b UNIVERSITY OF ILLINOIS AT URBANA CHAMPAIGN   (United States)

^c AGRICULTURAL RESEARCH SERVICE   (United States)

^d Bairro Centro   (Brazil)

^e MONTANA STATE UNIVERSITY   (United States)

Author keywords

Agronomic improvement; Biotechnology; Brazil; Genetic improvement; Physiological changes; Soil management practice; Soybean production

Indexed keywords

EID: 85102887304     PISSN: None     EISSN: None     Source Type: Book    
DOI: 10.2135/cssaspecpub33.c12     Document Type: Chapter

References (102)

1. Alliprandini, L.F., J.F.F. de Toledo, R.A.S. Kiihl, J. de S. Fonseca Junior, and L.A. de Almeida. 1993. Ganho genético em soja no Estado do Paraná. Pesq. Agropec. Brasil. 28:489-497.
2. Arantes, N.E., and P.I. de M. Souza. 1993. Cultura da Soja nos Cerrados. Associaçao Brasileira para Pesquisa da Potassa e do Fosfato-Potafos, Piracicaba, S.P., Brazil.
3. Baker, N.T. 2011. Tillage practices in the conterminous United States, 1989-2004 Datasets Aggregated by Watershed. USGS Data Series 573. http://pubs.usgs.gov/ds/ds573/pdf/dataseries573final.pdf (accessed 12 Nov. 2013).
4. Bastidas, A.M., T.D. Setiyono, A. Dobermann, K.G. Cassman, R.W. Elmore, G.L. Graef, and J.E. Specht. 2008. Soybean sowing date: The vegetative, reproductive, and agronomic impacts. Crop Sci. 48:727-740. doi:10.2135/cropsci2006.05.0292
5. Bernard, R.L., G.A. Juvik, E.E. Hartwig, and C.J. Edwards, Jr. 1988. Origins and pedigrees of public soybean varieties in the United States and Canada. USDA Tech. Bull. 1746. U.S. Gov. Print. Office, Washington, DC.
6. Bernard, R.L., G.A. Juvik, and R.L. Nelson. 1987. USDA soybean germplasm collection inventory. Vol. 1. International Agricultural Publications. INTSOY Series Number 30. USDA and Univ. or Illinois, Urbana, IL.
7. Bernard, R.L., G.A. Juvik, and R.L. Nelson. 1989. USDA soybean germplasm collection inventory. Vol. 2. International Agricultural Publications. INTSOY Series Number 31. USDA and Univ. or Illinois, Urbana, IL.
8. Boerma, H.R. 1979. Comparison of past and recently developed soybean cultivars in maturity groups VI, VII, and VIII. Crop Sci. 19:611-613. doi:10.2135/cropsci1979.0011183X001900050015x
9. Brown-Guedira, G.L., J.A. Thompson, R.L. Nelson, and M.L. Warburton. 2000. Evaluation of genetic diversity of soybean introductions and North American ancestors using RAPD and SSR markers. Crop Sci. 40:815-823. doi:10.2135/cropsci2000.403815x
10. Cahill, D.J., and D.H. Schmidt. 2004. Use of marker assisted selection in a product development breeding program. In: T. Fischer et al. New directions for a diverse planet: Proceedings for the 4th International Crop Science Congress, Brisbane, Australia, 26 Sept.-1 Oct. 2004. http:// www.cropscience.org.au/icsc2004/symposia/3/4/133_schmidtdh.htm (accessed 12 Nov. 2013).
11. Carter, T.E., Jr., Z. Gizlice, and J.W. Burton. 1993. Coefficient of parentage and genetic similarity estimates for 258 North American soybean cultivars released by public agencies during 1954-88. USDA Tech. Bull.1814. U.S. Gov. Print. Office, Washington, DC.
12. Carter, T.E., R.L. Nelson, C.H. Sneller, and Z. Cui. 2004. Genetic diversity in soybean. In: HR. Boerma and J.E. Specht, editors, Soybeans: Improvement, production, and uses. 3rd ed. Agron. Monogr. 16. ASA, CSSA, SSSA, Madison, WI. p. 303-416. doi:10.2134/agronmonogr16.3ed.c8
13. Chung, J.H., L. Babka, G.L. Graef, P.E. Staswick, D.J. Lee, P.B. Cregan, R.C. Shoemaker, and J.E. Specht. 2003. The seed protein, oil, and yield QTL on soybean linkage group I. Crop Sci. 43:1053-1067. doi:10.2135/cropsci2003.1053
14. Crochet, W.D., editor. 2012. Uniform soybean tests, northern states. USDA-ARS, West Lafayette, IN.
15. Crookston, R.K., J.E. Kurle, P.J. Copeland, J.H. Ford, and W.E. Lueschen. 1991. Rotational cropping sequence affects yield of corn and soybean. Agron. J. 83:108-113. doi:10.2134/agronj1991.0 0021962008300010026x
16. De Bruin, J.L., and P. Pedersen. 2008. Yield improvement and stability for soybean cultivars with resistance to Heterodera glycines Ichinohe. Agron. J. 100:1354-1359. doi:10.2134/ agronj2007.0412
17. de Toledo, J.F.F., L.A. de Almeida, R.A.S. Kiihl, and O.G. Menosso. 1990. Ganho genético em soja no Estado do Parana-Via Melhoramento, No Periodo de 1985/86 A 1989/90. Pesqi. Agropecu. Bras. 25:89-94.
18. de Toledo, J.F.F., C.G.P. de Carvalho, C.A.A. Arias, L.A. de Almeida, and R.L. Brogin. M. F de Oliveira, J.U.V. Moreira, A.S. Ribeiro, and D.M. Hiromoto. 2006. Genotype and environment interaction on soybean yield in Mato Grosso State, Brazil. Pesq. Agropec. Brasilia. 41:785-791.
19. de Toledo, J.F.F., D.M. Hiromoto, and C.A.A. Arias. 2000. A uniao faz a diferença. Agroanalysis, FGV. RJ, Brazil. Janeiro, Rio de Janeiro.
20. De Vries, B.D., and W.R. Fehr. 2011. Impact of the MON89788 event for glyphosate resistance on agronomic and seed traits of soybean. Crop Sci. 51:1023-1027. doi:10.2135/cropsci2010.11.0642
21. Dias, W.P., V.P. Campos, R.A.S. Kiihl, C.A.A. Arias, and J.F.F. Toledo. 2005. Genetic control in soybean of resistance to soybean cyst nematode race 4+. Euphytica 145:321-329. doi:10.1007/ s10681-005-1944-1
22. Diwan, N., and P.B. Cregan. 1997. Automated sizing of fluorescent-labeled simple sequence repeat (SSR) markers to assay genetic variation in soybean. Theor. Appl. Genet. 95:723-733. doi:10.1007/s001220050618
23. Eathington, S.R., T.M. Crosbie, M.D. Edwards, R.S. Reiter, and J.K. Bull. 2007. Molecular markers in a commercial breeding program. Crop Sci. 47:S154-S163. doi:10.2135/cropsci2007.04.0015IPBS
24. Egli, D.B. 2008a. Comparison of corn and soybean yields in the United States: Historical trends and future prospects. Agron. J. 100:S79-S88. doi:10.2134/agronj2006.0286c
25. Egli, D.B. 2008b. Soybean yield trends from 1972 to 2003 in mid-western USA. Field Crops Res. 106:53-59. doi:10.1016/j.fcr.2007.10.014
26. Elmore, R.A., R.S. Moomaw, and R. Selley. 1990. Narrow row soybeans. UNL Extension NEBGuide G90-964. http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1741&context=extensi onhist (accessed 12 Nov. 2013).
27. Elmore, R.W., F.W. Roeth, L.A. Nelson, C.A. Shapiro, R.N. Klein, S.Z. Knezevic, and A. Martin. 2001. Glyphosate-resistant soybean cultivar yields compared with sister lines. Agron. J. 93:408412. doi:10.2134/agronj2001.932408x
28. Erickson, B. 2008. Corn/soybean rotation literature summary. Purdue Univ., West Lafayette, IN. http://www.agecon.purdue.edu/pdf/Crop_Rotation_Lit_Review.pdf (accessed 12 Nov. 2013).
29. Fehr, W.R. 1987. Breeding methods for cultivar development. In: J.R. Wilcox, editor, Soybeans: Improvement, production, and uses. 2nd ed. Agron. Monogr. 16. ASA, CSSA and SSSA, Madison, WI. p. 249-293.
30. Fehr, W.R., C.E. Caviness, D.T. Burmood, and J.S. Pennington. 1971. Stage of development descriptions for soybeans, Glycine max (L.) Merrill. Crop Sci. 11:929-931. doi:10.2135/cropsci1971.00 11183X001100060051x
31. Fox, C.M., T.R. Cary, A.L. Colgrove, E.D. Nafziger, J.S. Haudenshield, G.L. Hartman, J.E. Specht, and B.W. Diers. 2013. Estimating soybean genetic gain for yield in the northern USA-Influence of cropping history. Crop Sci. 53:2473-2482. doi:10.2135/cropsci2012.12.0687
32. Gizlice, Z., T.E. Carter, Jr., and J.W. Burton. 1993. Genetic diversity in North American soybean: I. Multivariate analysis of founding stock and relation to coefficient of parentage. Crop Sci. 33:614-620. doi:10.2135/cropsci1993.0011183X003300030038x
33. Gizlice, Z., T.E. Carter, Jr., and J.W. Burton. 1994. Genetic base for North American public soybean cultivars released between 1947 and 1988. Crop Sci. 34:1143-1151. doi:10.2135/cropsci1994. 0011183X003400050001x
34. Godoi, C.R.C., J.B. Duarte, and J.B. Pinheiro. 2013. Genetic dissimilarity in tropical soybean genotypes. Paper presented at World Soybean Research Conference, IX. Durban, South Africa. 17-22 February.
35. Grassini, P., J. Thorburn, C. Burr, and K.G. Cassman. 2011. High-yield irrigated maize in the western U.S. Corn-Belt: I. On-farm yield, yield-potential, and impact of management practices. Field Crops Res. 120:142-150. doi:10.1016/j.fcr.2010.09.012
36. Grassini, P., H.S. Yang, and K.G. Cassman. 2009. Limits to maize productivity in Western CornBelt: A simulation analysis for fully irrigated and rainfed conditions. Agric. For. Meteorol. 149:1254-1265. doi:10.1016/j.agrformet.2009.02.012
37. Grau, C.R., and J.M. Gaska. 2002. Importance of fungicide seed treatments for soybeans. Univ. of Wisconsin, Madison. http://www.soils.wisc.edu/extension/wcmc/2002proceedings/Grau-Conf-2002.pdf (accessed 12 Nov 2013).
38. Hartwig, E.E. 1973. Varietal development. In: B.E. Caldwell, editor, Soybeans: Improvement, production, and uses. Agron. Monogr. 16. ASA, Madison, WI. p. 187-210.
39. Hassol, S.J. 2009. Global climate change impacts in the United States-2009 Report. U.S. Global Change Research Program. http://nca2009.globalchange.gov/agriculture (accessed 12 Nov. 2013).
40. Heffner, E.L., J.L. Jannink, H. Iwata, E. Souza, and M.E. Sorrells. 2011. Genomic selection accuracy for grain quality traits in biparental wheat populations. Crop Sci. 51:2597-2606. doi:10.2135/ cropsci2011.05.0253
41. Hiromoto, D.M., and N.A. Vello. 1986. The genetic base of Brazilian soybean (Glycine max') cultivars. Braz. J. Genet. 9:295-306.
42. Hymowitz, T., and J.R. Harlan. 1983. Introduction of soybean to North America by Samuel Bowen in 1765. Econ. Bot. 37:371-379. doi:10.1007/BF02904196
43. James, C. 2012. Global status of commercialized biotech/GM crops: 2012. ISAAA Brief 44-2012: Highlights. http://www.isaaa.org/resources/publications/briefs/44/highlights/default.asp (accessed 12 Nov 2013).
44. James, C. 2013. Soybean (Glycine max L.) GM events. Crops list-GM approval database. ISAAA. http://www.isaaa.org/gmapprovaldatabase/crop/default.asp?CropID=19 (accessed 12 Nov. 2013).
45. Jeschke, M. 2012. Crop insights. Row width in soybean. https://www.pioneer.com/home/site/us/ agronomy/library/template.CONTENT/guid.654CA746-2C95-A483-C396-D84F1F1DAE2D (accessed 12 Nov. 2013).
46. Johnson, D.M. 2013. A 2010 map estimate of annually tilled cropland within the conterminous United States. Agric. Syst. 114:95-105. doi:10.1016/j.agsy.2012.08.004
47. Keim, P., W. Beavis, J. Schupp, and R. Freestone. 1992. Evaluation of soybean RFLP marker diversity in adapted germplasm. Theor. Appl. Genet. 85:205-212.
48. Kelley, K.W., J.H. Long, and T.C. Todd. 2003. Long-term crop rotations affect soybean yield, seed weight, and soil chemical properties. Field Crops Res. 83:41-50. doi:10.1016/ S0378-4290(03)00055-8
49. Kiihl, R.A. de S., and A. Garcia. 1989. The use of the long-juvenile trait in breeding soybean cultivars. In: A.J. Pascale, editor, Proceedings: World Soybean Research Conference IV, Buenos Aires, Argentina. p. 994-1000.
50. Kisha, T.J., B.W. Diers, J.M. Hoyt, and C.H. Sneller. 1998. Genetic diversity among soybean plant introductions and North American germplasm. Crop Sci. 38:1669-1680. doi:10.2135/cropsci1 998.0011183X003800060042x
51. Li, Z., L. Qiu, J.A. Thompson, M. Welsh, and R.L. Nelson. 2001. Molecular genetic analysis of the U.S. and Chinese soybean ancestral lines. Crop Sci. 41:1330-1336. doi:10.2135/ cropsci2001.4141330x
52. Lindsey, L., and A. Sundermeier. 2013. Soybean plant date recommendations. Crop Observation and Recommendation Network. Ohio State Extension no. 2013-13. http://corn.osu.edu/news-letters/2013/2013-13-1/soybean-plant-date-recommendations-1 (accessed 12 Nov. 2013).
53. Messina, C., G. Hammer, Z. Dong, D. Podlich, and M. Cooper. 2009. Chapter 10. Modeling crop improvement in a GxExM framework via gene-trait-phenotype relationships. In: V.O. Sadras and D.F. Calderni, editors, Crop physiology: Applications for Genetic Improvement and Agronomy. Elsevier, Academic Press, New York. p. 235-265.
54. Mikel, M., B.W. Diers, R.L. Nelson, and H.H. Smith. 2010. Genetic diversity and agronomic improvement of North American soybean germplasm. Crop Sci. 50:1219-1229. doi:10.2135/ cropsci2009.08.0456
55. Miranda, Z. de F.S., C.A.A. Arias, C.E.C. Prete, R.A. de S. Kiihl, L.A. de Almeida, J.F. F. de Toledo, and D. Destro. 2007. Genetic characterization of ninety elite soybean cultivars using coefficient of parentage. Pesqi. Agropecu. Bras. 42:363-369. doi:10.1590/S0100-204X2007000300009
56. Morse, W.J., and J.L. Cartter. Rev. 1939. Soybean culture and varieties. USDA Farmers' Bull. 1520. U.S. Gov. Print. Office, Washington, DC.
57. Padgette, S.R., K.H. Klacz, X. Delannay, D.B. Re, B.J. LaVallee, C.N. Tinius, W.K. Rhodes, Y.I. Otero, G.F. Barry, D.A. Eichholtz, V.M. Peschke, D.L. Nida, N.B. Taylor, and G.M. Kishore. 1995. Development, identification, and characterization of a glyphosate-tolerant soybean line. Crop Sci. 35:1451-1461. doi:10.2135/cropsci1995.0011183X003500050032x
58. Pedersen, P. 2008. Row spacing in soybean. Iowa State University. http://extension.agron.iastate. edu/soybean/documents/RowSpacing.pdf (accessed 12 Nov. 2013).
59. Pedersen, P., and J.G. Lauer. 2004. Soybean growth and development response to rotation sequence and tillage system. Agron. J. 96:1005-1012. doi:10.2134/agronj2004.1005
60. Porter, P., S. Chen, C. Reese, and L. Klossner. 2001. Population response of soybean cyst nematode to long term corn-soybean cropping sequences in Minnesota. Agron. J. 93:619-626. doi:10.2134/agronj2001.933619x
61. Posada, D., and T.R. Buckley. 2004. Model selection and model averaging in phylogenetics: Advantages of Akaike information criterion and Bayesian approaches over likelihood ratio tests. Syst. Biol. 53:793-808. doi:10.1080/10635150490522304
62. Probst, A.H., and R.W. Judd. 1973. Origin, U.S. history and development, and world distribution. In: B.E. Caldwell, editor, Soybeans: Improvement, production, and uses. Agron. Monogr. 16. ASA, Madison, WI. p. 1-15.
63. Quick, G.R., and W.F. Buchele. 1974. Reducing combine gathering losses in soybeans. Trans. ASAE 17:1123-1129. doi:10.13031/2013.37044
64. Rincker, K., R. Nelson, J. Specht, D. Sleper, T. Cary, S. R. Cianzio, S. Casteel, S. Conley, P. Chen, V. Davis, C. Fox, G. Graef, C. Godsey, D. Holshouser, G-L. Jiang, S. K. Kantartzi, W. Kenworthy, C. Lee, R. Mian, L. McHale, S. Naeve, J. Orf, V. Poysa, W. Schapaugh, G. Shannon, R. Uniatowski, D. Wang, and B. Diers. 2014. Genetic improvement of soybean in North American maturity groups II, III, and IV. Crop Sci. (in press).
65. Rowntree, S., J. Suhre, E. Wilson, V. Davis, B. Diers, S. Casteel, P. Esker, and S. Conley. 2014. Physiological and phenological responses of historical soybean cultivar releases to earlier planting. Crop Sci. (in press). doi:10.2135/CROPSCI2013.06.0428.
66. Rowntree, S.C., J.J. Suhre, E.W. Wilson, V.M. Davis, B.W. Diers, S.N. Casteel, P.D. Esker, J.E. Specht, and S.P. Conley. 2013. Genetic gain x management interactions in soybean: I. Planting date. Crop Sci. 53:1128-1138. doi:10.2135/cropsci2012.03.0157
67. Sacks, W.J., and C.J. Kucharik. 2011. Crop management and phenology trends in the U.S. Corn Belt: Impacts on yields, evapotranspiration and energy balance. Agric. For. Meteorol. 151:882-894. doi:10.1016/j.agrformet.2011.02.010
68. Sakamoto, Y., M. Ishiguro, and G. Kitagawa. 1986. Akaike information criterion statistics. KTK Scientific Publishers, Tokyo, Japan.
69. Salado-Navarro, L.R., T.R. Sinclair, and K. Hinson. 1993. Change in yield and seed growth traits in soybean cultivars released in the southern USA from 1945 to 1983. Crop Sci. 33:1204-1209. doi:10.2135/cropsci1993.0011183X003300060019x
70. Salvagiotti, F., K.G. Cassman, J.E. Specht, D.T. Walters, A. Weiss, and A. Dobermann. 2008. Nitrogen uptake, fixation and response to fertilizer N in soybeans: A review. Field Crops Res. 108:1-13. doi:10.1016/j.fcr.2008.03.001
71. Scott, W.O., and S.R. Aldrich. 1970. Modern soybean production. 1st ed. S&A Publ., Inc, Champaign, IL.
72. Sebastian, S.A., L.G. Streit, P.A. Stephens, J.A. Thompson, B.R. Hedges, M.A. Fabrizius, J.F. Soper, D.H. Schmidt, R.L. Kallem, M.A. Hinds, L. Feng, and J.A. Hoeck. 2010. Context-specific marker-assisted selection for improved grain yield in elite soybean populations. Crop Sci. 50:1196-1206. doi:10.2135/cropsci2009.02.0078
73. Setiyono, T.D., K.G. Cassman, J.E. Specht, A. Dobermann, A. Weiss, H. Yang, S.P. Conley, A.P. Robinson, P. Pedersen, and J.L. De Bruin. 2010. Simulation of soybean growth and yield in near-optimal growth conditions. Field Crops Res. 119:161-174. doi:10.1016/j.fcr.2010.07.007
74. Sinclair, T.R., and T. Horrie. 1989. Leaf nitrogen, photosynthesis, and crop radiation use efficiency: A review. Crop Sci. 29:90-98. doi:10.2135/cropsci1989.0011183X002900010023x
75. Sinclair, T.R., and T.W. Rufty. 2012. Nitrogen and water resources commonly limit crop yield increases, not necessarily plant genetics. Global Food Security 1:94-98. doi:10.1016/j. gfs.2012.07.001
76. Sinclair, T.R., C.P. Tanner, and J.M. Bennet. 1984. Water use efficiency in crop production. Bioscience 34:36-40. doi:10.2307/1309424
77. Skorupska, H.T., R.C. Shoemaker, A. Warner, E.R. Shipe, and W.C. Bridges. 1993. Restriction fragment length polymorphism in soybean germplasm of the southern USA. Crop Sci. 33:1169-1176. doi:10.2135/cropsci1993.0011183X003300060013x
78. Smith, S., M. Cooper, J. Gogerty, C. Loeffler, D. Borcherding, and K. Wright. 2014. Maize. In: S. Smith, B. Diers, J. Specht, and B. Carver, editors, Yield gains in major U.S. field crops. CSSA Spec. Publ. 33. ASA, CSSA, and SSSA, Madison, WI. p. 125-172. doi: 0.2135/cssaspecpub33.c6
79. Sneller, C.H. 1994. Pedigree analysis of elite soybean lines. Crop Sci. 34:1515-1522. doi:10.2135/cro psci1994.0011183X003400060019x
80. Sneller, C.H. 2003. Impact of transgenic genotypes and subdivision on diversity within elite North American soybean. Crop Sci. 43:409-414. doi:10.2135/cropsci2003.0409
81. Specht, J.E. 2013. NE irrigated and rainfed yield trends. University of Nebraska Extension. http:// cropwatch.unl.edu/web/soybeans/yields (accessed 12 Nov 2013).
82. Specht, J., P. Grassini, and J. Rees. 2013. Data show Nebraskans planting soybeans earlier each year. University of Nebraska Extension. http://cropwatch.unl.edu/web/cropwatch/ archive?articleID=5149479 (accessed 12 Nov. 2013).
83. Specht, J.E., D.J. Hume, and S.V. Kumudini. 1999. Soybean yield potential-a genetic and physiological perspective. Crop Sci. 39:1560-1570. doi:10.2135/cropsci1999.3961560x
84. Specht, J.E., and J.H. Williams. 1984. Contribution of genetic technology to soybean productivity-Retrospect and prospect. In: W.R. Fehr, editor, Genetic contribution to yield gains of five major crop plants. CSSA Special Publ. 7. CSSA and ASA, Madison, WI. p. 49-74. doi:10.2135/ cssaspecpub7.c3
85. Statistics Canada and Agriculture and Agri-Food Canada. 2012. Overview of the soybean sector in Manitoba. Statistics Canada, and Agriculture and Agri-Food Canada, June 2012. http:// www.gov.mb.ca/agriculture/statistics/pdf/crop_soybean_sector.pdf (accessed 12 Nov 2013).
86. Stein, A.J., and E. Rodríguez-Cerezo. 2009. The global pipeline of new GM crops: Implications of asynchronous approval for international trade. JRC Technical Report EUR 23486 EN. Luxembourg: Office for Official Publications of the European Communities. http://ipts.jrc. ec.europa.eu/publications/pub.cfm?id=2420 (accessed 12 Nov. 2013).
87. Tans, P., and R. Keeling. 2013. Trends in atmospheric carbon dioxide. NOAA/ESRL http://www.esrl. noaa.gov/gmd/ccgg/trends/#mlo_full (accessed 12 Nov. 2013).
88. Temperly, R.J., and R. Borges. 2006. Tillage and crop rotation impact on soybean grain yield and composition. Agron. J. 98:999-1004. doi:10.2134/agronj2005.0215
89. Thompson, J.A., and R.L. Nelson. 1998. Core set of primers to evaluate genetic diversity in soybean. Crop Sci. 38:1356-1362. doi:10.2135/cropsci1998.0011183X003800050034x
90. Thorson, T. 2007. Soybean objective yield survey data, 1992-2006. http://usda01.library.cornell. edu/usda/current/SoyObjYield/SoyObjYield-07-27-2007.pdf (accessed 12 Nov 2013).
91. Toledo, J.F.F., M.F. Oliveira, A.C. Tsutida, and R.A.S. Kiihl. 1993. Genetic analysis of growth of determinate soybean genotypes under three photoperiods. Rev. Bras. Genet. 16:713-748.
92. Twine, T.E., and C.J. Kucharik. 2009. Climate impacts on net primary productivity trends in natural and managed ecosystems of the central and eastern United States. Agric. For. Meteorol. 149:2143-2161. doi:10.1016/j.agrformet.2009.05.012
93. Ustun, A., F.L. Allen, and B.C. English. 2001. Genetic progress in soybean of the US midsouth. Crop Sci. 41:993-998. doi:10.2135/cropsci2001.414993x
94. Van Wart, J., K.C. Kersebaumb, S. Peng, M. Milner, and K.G. Cassman. 2013. Estimating crop yield potential at regional to national scales. Field Crops Res. 143:34-43. doi:10.1016/j. fcr.2012.11.018
95. Vilsack, T., and C.Z.F. Clark. 2008. The 2007 Census of Agriculture. Farm and Ranch Irrigation Survey. Volume 3. Special Studies. Part 1. AC-07-SS-1. http://www.agcensus.usda.gov/Publications/2007/Online_Highlights/Farm_and_Ranch_Irrigation_Survey/fris08.pdf (accessed 12 Nov. 2013).
96. Voldeng, H.D., E.R. Cober, D.J. Hume, C. Gillard, and M.J. Morrison. 1997. Fifty-eight years of genetic improvement of short-season soybean cultivars in Canada. Crop Sci. 37:428-431. doi:10.2135/cropsci1997.0011183X003700020020x
97. Waltz, E. 2010. Food firms test fry Pioneer's trans fat-free soybean oil. Nat. Biotechnol. 28:769-770. doi:10.1038/nbt0810-769a
98. Wilcox, J.R. 2001. Sixty years of improvement in publicly developed elite soybean lines. Crop Sci. 41:1711-1716. doi:10.2135/cropsci2001.1711
99. Wilson, E.W., S.C. Rowntree, J.J. Suhre, N.H. Weidenbenner, S.P. Conley, V.M. Davis, B.W. Diers, P.D. Esker, S.L. Nave, J.E. Specht, and S.N. Casteel. 2014. Genetic gain x management interactions in soybean: II. Nitrogen utilization. Crop Sci. 54:340-348. doi:10.2135/cropsci2013.05.0339
100. Xu, Z., D.A. Hennessy, K. Sardana, and G. Moschini. 2013. The realized yield effect of genetically engineered crops: U.S. maize and soybean. Crop Sci. 53:735-745. doi:10.2135/ cropsci2012.06.0399
101. Zhang, L.X., S. Kyei-Boahen, J. Zhang, M.H. Zhang, T.B. Freeland, C.E. Watson, Jr., and X.M. Liu. 2007. Modifications of optimum adaptation zones for soybean maturity groups in the USA. Crop Manage. doi:10.1094/CM-2007-0927-01-RS
102. Zhu, X.G., S.P. Long, and D.R. Ort. 2010. Improving photosynthetic efficiency for greater yield. Annu. Rev. Plant Biol. 61:235-261. doi:10.1146/annurev-arplant-042809-112206