Data/hora: 01/06/2024 12:15:06

Biblioteca(s): 	Embrapa Caprinos e Ovinos.	
Data corrente: 	14/10/2015	
Data da última atualização: 	03/03/2016	
Autoria: 	SOUZA, H. A. de; ROZANE, D. E.; AMORIM, D. A.; DIAS, M. J. T.; MODESTO, V. C.; NATALE, W.	
Afiliação: 	HENRIQUE ANTUNES DE SOUZA, CNPC; State University of São Paulo (USP) - Registro, SP, Brazil; Agricultural Research Company of Minas Gerais - Caldas, MG, Brazil; USP - Jaboticabal, SP, Brazil; USP - Jaboticabal, SP, Brazil; USP - Jaboticabal, SP, Brazil.	
Título: 	Assessment of nutritional status of guava seedlings using preliminary DRIS norms and sufficiency ranges.	
Ano de publicação: 	2015	
Fonte/Imprenta: 	Journal of Plant Nutrition, v. 38, n. 10, p. 1611-1618, Aug. 2015.	
DOI: 	10.1080/01904167.2015.1017050	
Idioma: 	Inglês	
Conteúdo: 	Abstract: The objective of this work was to propose preliminary Diagnosis and Recommendation Integrated System (DRIS) norms and derive critical levels and nutrient sufficiency ranges in the leaves of guava plants in commercial nursery conditions. Sixty-eight leaf samples were evaluated from fertilization trials with seedlings. In the low-yield subpopulation (84% of the population), the limiting nutrients by deficiency in descending order were nitrogen (N)> copper (Cu)>phosphorus (P) = potassium (K)> manganese (Mn)> iron (Fe) = zinc (Zn)> sulfur (S)> boron (B) = magnesium (Mg)> calcium (Ca), and the limiting ones by excess in descending order were B > Ca > Fe > Mn > S > Mg > Cu > P > Zn > N = K. The ranges of the appropriate DRIS indices were 24 to 28, 2.4 to 3.1, 21 to 29, 6 to 8, 1.9 to 2.9 and 1.9 to 2.3 (g kg?1) for the macronutrients N, P, K, Ca, Mg and S, respectively, and 35 to 48, 4 to 15, 68 to 93, 31 to 60 and 180 to 245 (mg kg-1) for the micronutrients B, Cu, Fe, Mn and Zn, respectively. The dry matter production of guava seedlings was associated with the nutritional status.	
Palavras-Chave: 	DRIS; Leaf analysis; Nursery.	
Thesagro: 	Análise Foliar; Fertilizante nitrogenado; Goiaba; Macroelemento; Microelemento; Muda; Nitrogênio; Nutrição vegetal; Psidium Guajava.	
Thesaurus Nal: 	Nitrogen fertilizers; Nutritional status; Trace elements.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
Registro original: 	Embrapa Caprinos e Ovinos (CNPC)	
Exemplares: 	CNPC - (29294-1) - UPC - AP - PP -  -  -  - DIS