Título:	Evaluation of the nutritional state and proposal of sufficiency ranges for Megathyrsus maximus ‘BRS Tamani’ using the compositional nutrient diagnosis and boundary line methods.
Autoria:	MESQUITA, A. M. S. de ROZANE, D. E. POMPEU, R. C. F. F. CÂNDIDO, M. J. D. LOPES, M. N. NATALE, W. CONCEIÇÃO, M. P. da LIMA, J. D. TAVARES, R. de K. O. SOUZA, H. A. de
Afiliação:	ANTONIA MARTA SOUSA DE MESQUITA, UNIVERSIDADE ESTADUAL DO VALE DO ACARAÚ DANILO EDUARDO ROZANE, UNIVERSIDADE ESTADUAL PAULISTA “JÚLIO DE MESQUITA FILHO” ROBERTO CLAUDIO FERNANDES FRANCO POMPEU, CNPC MAGNO JOSÉ DUARTE CÂNDIDO, UNIVERSIDADE FEDERAL DO CEARÁ MARCOS NEVES LOPES, INSTITUTO FEDERAL DE EDUCAÇÃO, CIÊNCIA E TECNOLOGIA DO CEARÁ, CAMPUS CRATEÚS WILLIAM NATALE MARIANA PASSOS DA CONCEIÇÃO, UNIVERSIDADE ESTADUAL PAULISTA “JÚLIO DE MESQUITA FILHO” JULIANA DOMINGUES LIMA, UNIVERSIDADE ESTADUAL PAULISTA “JÚLIO DE MESQUITA FILHO” RITA DE KÁSSIA OLIVEIRA TAVARES, UNIVERSIDADE ESTADUAL DO VALE DO ACARAÚ HENRIQUE ANTUNES DE SOUZA, CPAMN.
Ano de publicação:	2026
Referência:	Revista Brasileira de Ciência do Solo, v. 50, e025015, 2026.
Conteúdo:	Abstracts: Brazil has the largest commercial cattle herd in the world, with 197.2 million head in 2023, representing approximately 12 % of the global herd. Cattle raising in Brazil is primarily carried out in pasture grazing systems. In this context, the adoption of well-adapted, high-yielding, and nutritious forage crops is essential for the sustainability of cattle raising, cost reduction, and increased yield efficiency. The cultivar ‘BRS Tamani’, a Megathysus maximus hybrid, stands out for its short plant height, high nutritional value, and resistance to pasture spittlebug and is recommended for well-drained soils of medium to high fertility, typical of the Brazilian Cerrado region. Despite its high potential, information is lacking regarding nutritional standards for the cultivar, which hinders precise fertilization recommendations. This study aimed to establish nutritional sufficiency ranges for BRS Tamani using the Compositional Nutrient Diagnosis (CND) and boundary line methods, aiming to improve nutrient management and promote yield gains. A database was used to compile information from 123 experimental units of BRS Tamani during the period from July to December 2017. Leaf samples were collected at various growth cycles / cuttings of the forage crop, and chemical analyses were performed to determine contents of nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), and sulfur (S). The CND method was used to calculate nutritional levels and identify nutrient imbalances. The boundary line method was applied to establish relationships between yield and the levels of each nutrient. The following critical levels were proposed by the CND: N = 20 g kg-1; P = 2.2 g kg-1; K = 20 g kg-1; Ca = 2.3 g kg-1; Mg = 2.8 g kg-1; and S = 1.4 g kg-1. The values obtained by the boundary line method were as follows: N = 23 g kg-1; P = 2.3 g kg-1; K = 20 g kg-1; Ca = 2.6 g kg-1; Mg = 2.8 g kg-1; and S = 1.3 g kg-1. Highlights: Suggestion of sufficiency ranges for nutrient diagnosis of Megathyrsus maximus ‘BRS Tamani’. The CND and boundary line methods enable determination of sufficiency ranges for forage crops. Region-specific nutritional standards should be established for forage crops.
NAL Thesaurus:	Plant nutrition Pastures Pasture plants Forage crops Megathyrsus maximus Soil management Soil fertility
Palavras-chave:	BRS Tamani Compositional Nutrient Diagnosis Soil use
Digital Object Identifier:	10.36783/18069657rbcs20250152
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPC)