A. P. S. Souza Filho, C. A. C. Veloso and J. R. N. Grama, “Nutrient Absorption of Brachiaria Brizantha and the Weed Urena Lobata as Influenced by pH,” Planta Daninha, Vol. 18, No. 3, 2000, pp. 443-450.
 R. Millaleo, M. Reyes-Díaz, A. G. Ivanov, M. L. Mora and M. Alberdi, “Manganese as Essential and Toxic Element for Plants: Transport, Accumulation and Resistance Mechanisms,” Journal of Soil Science and Plant Nutrition, Vol. 10, No. 4, 2010, pp. 476-494.
 C. Wunsch, J. O. J. Barcellos, E. R. Prates, R. A. Grecellé and E. C. Costa, “Trace Elements to Beef Cattle in the Native Pastures of Campos de Cima da Serra, RS, Brazil,” Ciência Rural, Vol. 35, No. 4, 2005, pp. 903-908.
 A. P. Puga, R. M. Prado, D. M. Melo, I. M. Guidi, K. Ortega, S. S. Cardoso and T. B. Almeida, “Effects of Manganese on Growth, Nutrition and Dry Matter Production of Plants of Brachiaria Brizantha (cv. MG4) in Greenhouse Conditions,” Revista Ceres, Vol. 58, No. 6, 2011, pp. 811-816.
 F. L. C. Mingotte, C. L. R. Santos, R. M. Prado, R. A. Flores, A. H. Togoro, J. A. S. Silva, L. S. Politi, A. S. Pinto and D. S. Aquino, “Manganese in the Nutrition and Dry Mass Production of the Mombaca Grass,” Bioscience Journal, Vol. 27, No. 6, 2011, pp. 879-887.
 T. B. Sylvestre, F. Kuhnen, E. R. Silva, P. E. S. Martins, F. S. Galatti and R. M. Prado, “Response Tanzania Grass to Application of Manganese,” Bioscience Journal, Vol. 28, No. 5, 2012, pp. 684-691.
 A. Rosas, Z. Rengel and M. Mora, “Manganese Supply and pH Influence Growth, Carboxylate Exudation and Peroxidase Activity of Ryegrass and White Clover,” Journal of Plant Nutrition, Vol. 30, 2007, pp. 253-270.
 M. Mora, A. Rosas, A. Ribera and R. Rengel, “Differential Tolerance to Mn Toxicity in Perennial Ryegrass Genotypes: Involvement of Antioxidative Enzymes and Root Exudation of Carboxylates,” Plant Soil, Vol. 32, 2009, pp. 79-89.
 U. Najeeb, L. Xu, A. Shafaqat, G. Jilani, H. J. Gong, W. Q. Shen and W. J. Zhou, “Citric Acid Enhances the Phytoextraction of Manganese and Plant Growth by Alleviating the Ultrastructural Damages in Juncus effuses L.,” Journal Hazardous Material, Vol. 170, No. 2, 2009, pp. 1156-1163. http://dx.doi.org/10.1016/j.jhazmat.2009.05.084
 C. G. S. Benett, S. Buzetti, K. S. Silva, M. C. M. Teixeira Filho, C. M. P. Garcia and P. R. Maestrelo, “Yield and Development of Plant Cane and Ratoon Cane as Related to Manganese Rates and Source,” Revista Brasileira de Ciência do Solo, Vol. 35, No. 5, 2011, pp. 1661-1668.
 E. E. Mesquita, J. C. Pinto, A. E. Furtini Neto, I. P. A. Santos and V. B. Tavares, “Critical Phosphorus Concentrations in Three Soils for the Establishment of Mombaca Grass, Marandu Grass and Andropogon Grass,” Revista Brasileira de Zootecnia, Vol. 33, No. 2, 2004, pp. 290301. http://dx.doi.org/10.1590/S1516-35982004000200004
 O. S. C. Neves, J. G. Carvalho, F. A. D. Martins, T. R. P. Pádua and P. J. Pinho, “Use of SPAD-502 in the Evaluation of Chlorophyll Contents and Nutritional Status of Herbaceous Cotton to Nitrogen, Sulphur, Iron and Manganese,” Pesquisa Agropecuaria Brasileira, Vol. 40, No. 12, 2005, pp. 517-521.
 Y. Lei, H. Korpelainen and C. Li, “Physiological and Biochemical Responses to High Mn Concentrations in Two Contrasting Populus cathayana Populations”, Chemosphere, Vol. 68, No. 4, 2007, pp. 686-694.
 T. El-Jaqual and D. A. Cox, “Manganese Toxicity in Plants,” Journal of Plant Nutrition, Vol. 21, No. 2, 1998, pp. 353-386.
 J. Lavres Junior, M. F. Moraes, C. P. Cabral and E. Malavolta, “Genotypic Influence on the Absorption and Toxicity of Manganese in Soybean,” Revista Brasileira de Ciência do Solo, Vol. 32, No. 1, 2008, pp. 173-181.