Data/hora: 28/05/2024 02:31:34

Biblioteca(s): 	Embrapa Meio-Norte.	
Tipo da produção científica: 	Artigo em Periódico Indexado	
Circulação/Nível: 	B - 1	
Data corrente: 	25/09/2020	
Data da última atualização: 	22/01/2024	
Autoria: 	MELO, F. de B.; SOUZA, H. A. de; BASTOS, E. A.; CARDOSO, M. J.	
Afiliação: 	FRANCISCO DE BRITO MELO, CPAMN; HENRIQUE ANTUNES DE SOUZA, CPAMN; EDSON ALVES BASTOS, CPAMN; MILTON JOSE CARDOSO, CPAMN.	
Título: 	Critical levels and sufficiency ranges for leaf nutrient diagnosis in cowpea grown in the Northeast region of Brazil.	
Ano de publicação: 	2020	
Fonte/Imprenta: 	Revista Ciência Agronômica, v. 51, n. 4, e20196954, 2020.	
ISSN: 	1806-6690	
DOI: 	10.5935/1806-6690.20200071	
Idioma: 	Inglês	
Conteúdo: 	Proposing sufficiency ranges and critical levels is an important technique for correct evaluation of leaf nutrient diagnosis. In this study, the objective was to propose critical levels and sufficiency ranges of macro- and micronutrients for the diagnostic leaf of cowpea, collected at flowering, with the results of macro- and micronutrients and productivity in the Northeast of Brazil. The critical level was calculated by the reduced normal distribution and by the boundary line method, which was also used to generate sufficiency ranges. For the critical level by reduced normal distribution, the relationship of the nutrients with 90% of maximum productivity was adopted. For the boundary line, the relationship of the nutrients that are in the upper line of a dispersion diagram was considered. The critical levels by reduced normal distribution for nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), copper (Cu), iron (Fe), manganese (Mn) and zinc (Zn) are: 35.3 g kg-1, 1.8 g kg-1, 20.5 g kg-1, 11.1 g kg-1, 2.6 g kg-1, 3.2 mg kg-1, 105 mg kg-1, 89 mg kg-1and 22 mg kg-1, respectively. However, the critical levels generated by the boundary line for N, P, K, Ca, Mg, Cu, Fe, Mn and Zn are 39.5 g kg-1, 2.3 g kg-1, 21.2 g kg-1, 11.3 g kg-1, 2.9 g kg-1, 4.2mg kg-1, 142 mg kg-1, 143mg kg-1 and 24 mg kg-1, respectively. The sufficiency ranges by the boundary line method, to achieve 95% of maximum productivity, are equivalent to 34.4-44.7g kg-1, 1.7-2.9 g kg-1,18.6-23.6 g kg-1,8.8-13.7 g kg-1,2.3-3.5 g kg-1,3.1-5.4 mg kg-1,73-210 mg kg-1,104-181 mg kg-1 and 22-27 mg kg-1 for N, P, K, Ca, Mg, Cu, Fe, Mn and Zn, respectively.	
Thesagro: 	Feijão de Corda; Folha; Nutrição Vegetal; Nutriente Mineral; Vigna Unguiculata.	
Thesaurus Nal: 	Cowpeas; Plant micronutrients; Plant nutrition; Vigna.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/216214/1/CriticalSufficiencyNutrientCowpeaRCA2020.pdf	
Registro original: 	Embrapa Meio-Norte (CPAMN)	
Exemplares: 	CPAMN - (33015-1) - UPC - AP - DD -  -  -  - DIS