Data/hora: 07/06/2024 06:28:24

Biblioteca(s): 	Embrapa Arroz e Feijão.	
Data corrente: 	05/08/2013	
Data da última atualização: 	31/10/2013	
Autoria: 	SOBRAL, L. F.; SMYTH, J. T.; FAGERIA, N. K.; STONE, L. F.	
Afiliação: 	LAFAYETTE FRANCO SOBRAL, CPATC; J. T. SMYTH, NORTH CAROLINA STATE UNIVERSITY; NAND KUMAR FAGERIA, CNPAF; LUIS FERNANDO STONE, CNPAF.	
Título: 	Comparison of copper, manganese, and zinc extraction with Mehlich 1, Mehlich 3, and DTPA solutions for soils of the Brazilian Coastal Tablelands.	
Ano de publicação: 	2013	
Fonte/Imprenta: 	Communications in Soil Science and Plant Analysis, New York, v. 44, n. 17, p. 2507-2513, 2013.	
ISSN: 	0010-3624	
DOI: 	10.1080/00103624.2013.812731	
Idioma: 	Inglês	
Conteúdo: 	Deficiency of micronutrients is increasing in crop plants in recent years in Oxisols and Ultisols in the tropics. The predominant soils in the coastal tablelands of Brazil are Ultisols and Oxisols, with low cation exchange capacity and kaolinitic clay mineralogy. Soil copper (Cu), manganese (Mn), and zinc (Zn) extracted by the Mehlich 1 solution, currently used in the regional soil-testing laboratories, were compared with those extracted by the Mehlich 3 and diethylenetriaminepentaacetic acid (DTPA) solutions in a greenhouse experiment with 10 soil samples (0-20 cm deep) collected from representative Ultisols and Oxisols from various locations in the region. Corn was grown as a test crop, and its dry matter and micronutrient uptake was measured at 30 days of growth. Soil Cu, Mn, and Zn extracted with the three solutions were significantly correlated (0.65-0.95 range for r values), with the Mehlich 3 solution extracting greater quantities than the Mehlich 1 and DTPA solutions. Zinc and Cu taken up by corn plants were significantly related to their soil-extractable levels measured at harvest with all three of the solutions, except for Zn DTPA. However, similar relations between plant uptake and soil extractable Mn were poor, except for DTPA extracting solution.	
Thesagro: 	Microelemento; Solo.	
Thesaurus Nal: 	Plant micronutrients; Soil analysis.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Arroz e Feijão (CNPAF)	
Exemplares: 	CNPAF - (32230-1) - UPC - AP - DD - 2013.038 -  - 2013.038 - DIS