CONAB—Companhia Nacional De Abastecimento (2010) Acompanhamento da Safra Brasileira de grãos.http://www.conab.gov.br/
 Anghinoni, I. and Bohnen, H. (1975) Soil fertility survey in Santa Rosa region. Agronomia Sulriograndense, 11, 289-301. (in Portuguese)
 Tedesco, M.J., Goepfert, C.F. and Lanzer, E. (1984) Soil fertility evaluation in soils of Rio Grande do Sul state. Agronomia Sulriograndense, 20, 179-184. (in Portuguese)
 Drescher, M., Bissani, C.A. and Giasson, E. (1995) Soil fertility evaluation of Soils from Rio Grande do Sul State and lime and fertilizers demand. UFRGS Soils Department, Porto Alegre, 24p. (in Portuguese)
 Rheinheimer, D.S., Gatiboni, L.C. and Kaminski, J. (2001) Soil fertility status in soils from Rio Grande do Sul state. Technical Report, Federal University of Santa Maria, Santa Maria, 41p. (in Portuguese)
 Schlindwein, J.A. and Gianello, C. (2008) Calibration of phosphorus extraction methods in soils cultivated under no-tillage. Revista Brasileira de Ciência do Solo, 32, 2037-2049. (in Portuguese) http://dx.doi.org/10.1590/S0100-06832008000500025
 Bortolon, L., Schlindwein, J.A. and Gianello, C. (2009) Soil phosphorus and potassium extractant in soils under no till. Ciência Rural, 39, 2400-2407. (in Portuguese) http://dx.doi.org/10.1590/S0103-84782009005000173
 Schlindwein, J.A., Bortolon, L. and Gianello, C. (2011) Calibration of potassium soil test methods in soils under no tillage system. Revista Brasileira de Ciência do Solo, 34, 1669-1678. (in Portuguese) http://dx.doi.org/10.1590/S0100-06832011000500021
 FecoAgro/RS (2004) Crop production costs in soils under no till in Southern Brazil. FecoAgro/RS, Porto Alegre, 35p. (in Portuguese)
 Cate, R.B. and Nelson, L.A. (1973) Discontinuous models for rapid correlation, interpretation and utilization of soil analysis and fertilizer response data. International Soil Fertility Evaluation and Improvement Program [S.l.], Technical Bulletin, 7, North Carolina. 77p.
 Comissao de Fertilidade do Solo—RS/SC (2004) Fertilizers and lime recommendations to crops in the Rio Grande do Sul and Santa Catarina States. 10th Edition, SBCS—Núcleo Regional Sul: UFRGS, Porto Alegre, 400p. (in Portuguese)
 Souza, D.M.G. and Lobato, E. (2002) Cerrado: Soil correction and fertilization. Embrapa Cerrados, Planaltina de Goiás, 416p. (in Portuguese)
 Costa, S.E.V.G.A., Souza, E.D., Anghinoni, I., Flores, J.C.P., Cao, E.G. and Holzschuh, M.J. (2009) Phosphorus and root distribution and corn growth as related to longterm tillage systems and fertilizer placement. Revista Brasileira de Ciência do Solo, 33, 1237-1247 (in Portuguese). http://dx.doi.org/10.1590/S0100-06832009000500017
 Tedesco, M.J., Gianello, C. and Bissani, C.A. (1995) Analysis of soils, plants and others materials. Soil Science Department of University of Rio Grande do Sul State, São Francisco de Paula, 147p. (in Portuguese).
 Mehlich, A. (1984) Mehlich-3 soil test extractant: A modification of Mehlich 2 extractant. Communications in Soil Science and Plant Analysis, 15, 1409-1416. http://dx.doi.org/10.1080/00103628409367568
 Cubilla, M.M., Amado, T.J.C., Wendling, A., Eltz, F.L.F. and Mielniczuk, J. (2007) Calibration of phosphorus fertilization rates for main grain crops under no-till in Paraguay. Revista Brasileira de Ciência do Solo, 31, 1463-1474. (in Portuguese) http://dx.doi.org/10.1590/S0100-06832007000600023
 Schlindwein, J.A. and Gianello, C. (2008) Level of sufficiency and equivalence index between phosphorus determined for methods ionic resin exchange and Mehlich-1. Revista Brasileira de Agrociencia, 14, 299-306. (in Portuguese)
 Kamprath, E.J. and Watson, M.E. (1980) Conventional soil and tissue test for assessing the phosphorus status of soil. In: Khasawneh, F.E., Sample, E.C. and Kamprath, E.J., Eds., The role of Phosphorus in Agriculture, America Society of Agronomy, Madison, 433-469.
 Novais, R.F. and Smyth, T.J. (1999) Phosphorus in plant and soil under tropical conditions. UFV, Viçosa, 399p.
 Perrot, K. and Kear, M. (2004) Influence of cation exchange on extraction of soil phosphate. Communications in Soil Science and Plant Analysis, 35, 461-470. http://dx.doi.org/10.1081/CSS-120029725
 Schlindwein, J.A., Bortolon, L. and Gianello, C. (2011) Soil phosphorus available for crops and grasses extracted with three soil-test methods in Southern Brazilian soils amended with phosphate rock. Communications in Soil Science and Plant Analysis, 42, 283-292. http://dx.doi.org/10.1080/00103624.2011.538881
 Van Raij, B. (1994) New diagnostics techniques, universal soil extractants. Communications in Soil Science and Plant Analysis, 25, 799-816. http://dx.doi.org/10.1080/00103629409369081
 Giacomini, S.J., Aita, C., Hübner, A.P., Lunkes, A., Guidini, E. and Amaral, E.B. (2003) Phosphorus and potassium release during decomposition of crops residues in no-tillage system. Pesquisa Agropecuária Brasileira, 38, 1097-1104. (in Portuguese) http://dx.doi.org/10.1590/S0100-204X2003000900011
 Schlindwein, J.A. and Anghinoni, I. (2000) Vertical variability of available phosphorus and potassium and depth of soil sampling in no tillage system. Ciência Rural, 30, 611-617. (in Portuguese) http://dx.doi.org/10.1590/S0103-84782000000400009
 Kussow, W.R., Corum, K.R. and Dallacqua, F.M. (1976) Inperpretation of agro-economic of fertilizers plots. Embrapa, Sobral, 49p. (in Portuguese)
 Pavan, M.A. (1985) Chemical and mineralogical characteristics of selected acid soils of the state of Paraná. Turrialba, 35, 131-139.
 Nolla, A. and Anghinoni, I. (2006) Liming criteria for soybean in established no-tillage system. Revista Brasileira de Ciencia do Solo, 30, 475-483. (in Portuguese) http://dx.doi.org/10.1590/S0100-06832006000300009
 Nicolodi, M., Anghinoni, I. and Gianello, C. (2008) Soil acidity indicators for liming in no-tillage systems. Revista Brasileira de Ciência do Solo, 32, 237-247. (in Portuguese). doi10.1590/S0100-06832008000100023