Data/hora: 01/06/2024 11:46:28

Biblioteca(s): 	Embrapa Amazônia Oriental; Embrapa Rondônia.	
Tipo da produção científica: 	Artigo em Periódico Indexado	
Circulação/Nível: 	A - 2	
Data corrente: 	22/11/2018	
Data da última atualização: 	11/11/2019	
Autoria: 	MATOS, G. S. B. de; FERNANDES, A. R.; WADT, P. G. S.; FRANZINI, V. I.; SOUZA, E. M. de C.; RAMOS, H. M. N.	
Afiliação: 	Gilson Sergio Bastos de Matos, UFRA; Antonio Rodrigues Fernandes, UFRA; PAULO GUILHERME SALVADOR WADT, CPAF-RO; VINICIUS IDE FRANZINI, CPATU; Elmecelli Moraes de Castro Souza, UFRA; Helen Monique Nascimento Ramos, ICRAF.	
Título: 	Dris calculation methods for evaluating the nutritional status of oil palm in the Eastern Amazon.	
Ano de publicação: 	2018	
Fonte/Imprenta: 	Journal of Plant Nutrition, v. 41, n. 10, p. 1240-1252, 2018.	
DOI: 	10.1080/01904167.2018.1434199	
Idioma: 	Inglês	
Conteúdo: 	This study aimed to evaluate six Diagnosis and Recommendation Integrated System (DRIS) calculation methods, including two ways to choose the nutrient ratio [F (Letzsch) or R (Nick) values] combined with three functions (Beaufils, Jones, or Elwali and Gascho), and to generate nutritional diagnoses for oil palm. A total of 144 foliar samples in 33 plots in the Eastern Amazon, Brazil, were used. Except for potassium (K) in all calculation methods, the DRIS indices showed no correlation with soil nutrients. Regardless of the formula, the nutritional balance index correlated with the productivity (significant r values) and similar diagnostics were obtained. These diagnoses were reliable according to the chi-square test (&#967;2), and most observed frequencies presented &#967;2 calculated less than &#967;2 tabulated. The average frequencies of samples with nutrient deficiency were 51%, 42%, 37%, 35%, 32%, 30%, 30%, 25%, 20%, 12%, and 12% for samples with nitrogen (N), boron (B), manganese (Mn), sulfur (S), K, copper (Cu), iron (Fe), zinc (Zn), calcium (Ca), phosphorus (P), and magnesium (Mg), respectively. All tested DRIS methods may be used, and their diagnoses indicate the most common nutritional deficiencies in oil palm.	
Thesagro: 	Dendê; Elaeis Guineensis; Elaeis Oleifera; Fertilidade do Solo; Nutriente.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Rondônia (CPAF-RO)	
Exemplares: 	CPATU - (55493-1) - UPC - AP - DD -  -  -  - DIS
CPAF-RO - (18222-1) - UPC - AP - DD -  -  -  - DIS