[1] CONAB (COMPANHIA NACIONAL De ABASTECIMENTO) (2014) Acompanhamento da safra brasileira: Grãos, décimo levantamento, CONAB, safra 2013/2014. http://www.conab.gov.br
[2] Hungria, M., Campo, R.J. and Mendes, I.C. (2007) A importancia do processo de fixação biológica do nitrogênio para a cultura da soja: Componente essencial para a competitividade do produto brasileiro. Embrapa Soja. Documentos, 283, Embrapa Soja, Londrina.
http://www.infoteca.cnptia.embrapa.br/handle/doc/468512
[3] Sinclair, T.R. and Vadez, V. (2012) The Future of Grain Legumes in Cropping Systems. Crop Pasture Science, 63, 501-512. http://dx.doi.org/10.1071/CP12128
[4] IPCC (Intergovernmental Panel on Climate Change) (2007) Climate Change: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. IPCC, Paris. http://www.ipcc.ch
[5] Sinclair, T.R., Purcell, L.C., King, A., Sneller, C.H., Chen, P. and Vadez, V. (2007) Drought Tolerance and Yield Increase of Soybean Resulting from Improved Symbiotic N2 Fixation. Field Crops Research, 101, 68-71. http://dx.doi.org/10.1016/j.fcr.2006.09.010
[6] Serraj, R., Sinclair, T.R. and Purcell, L.C. (1999) Symbiotic N2 Fixation Response to Drought. Journal of Experimental Botany, 50, 143-155.
[7] Ladreira, R., Marino, D., Larrainzar, E., González, E.M. and Arrese-Igor, C. (2007) Reduced Carbon Availability to Bacteroids and Elevated Ureides in Nodules, but Not in Shoots, Are Involved in the Nitrogen Fixation Response to Early Drought in Soybean. Plant Physiology, 145, 539-546.
http://dx.doi.org/10.1104/pp.107.102491
[8] Chen, P., Sneller, C.H., Purcell, L.C., Sinclair, T.R., King, C.A. and Ishibashi, T. (2007) Registration of Soybean Germplasm Lines R01-416F and R01-581F for Improved Yield and Nitrogen Fixation under Drought Stress. Journal of Plant Registrations, 1, 166-167.
http://dx.doi.org/10.3198/jpr2007.01.0046crg
[9] EMBRAPA (Empresa Brasileira de Pesquisa Agropecuária) (1997) Manual de métodos de análise de solo. EMBRAPA-CNPS. Documentos 1, Centro Nacional de Pesquisa de Solos, EMBRAPA, Rio de Janeiro.
[10] Kaschuk, G., Hungria, M., Leffelaar P.A., Giller, K.E. and Kuyper, T.W. (2010) Differences in Photosynthetic Behaviour and Leaf Senescence of Soybean [Glycine max (L.) Merrill] Dependent on N2 Fixation or Nitrate Supply. Plant Biology, 12, 60-69.
http://dx.doi.org/10.1111/j.1438-8677.2009.00211.x
[11] Searle, P.L. (1984) The Berthelot or Indophenol Reaction and Its Use in the Analytical Chemistry of Nitrogen. Analyst, 109, 549-568. http://dx.doi.org/10.1039/an9840900549
[12] Vogels, G.D. and van der Drift, C. (1970) Differential Analysis of Glyoxylate Derivatives. Analytical Biochemistry, 33, 143-157. http://dx.doi.org/10.1016/0003-2697(70)90448-3
[13] Hungria, M. and Kaschuk, G. (2014) Regulation of N2 Fixation and NO3-/NH4+ Assimilation in Nodulated and N-Fertilized Phaseolus vulgaris L. Exposed to High Temperature Stress. Environmental and Experimental Botany, 98, 32-39.
http://dx.doi.org/10.1016/j.envexpbot.2013.10.010
[14] Silvente, S., Sobolev, A.P. and Lara, M. (2012) Metabolite Adjustments in Drought Tolerant and Sensitive Soybean Genotypes in Response to Water Stress. PLoS ONE, 7, e38554.
[15] Lopes, M.S., Araus, J.L., van Heerden, P.D.R. and Foyer, C.H. (2011) Enhancing Drought Tolerance in C4 Crops. Journal of Experimental Botany, 62, 3135-3153.