Data/hora: 03/06/2024 05:28:36

Biblioteca(s): 	Embrapa Meio Norte / UEP-Parnaíba.	
Data corrente: 	07/10/1996	
Data da última atualização: 	07/10/1996	
Autoria: 	RAIJ, B. van; CANTARELLA, H.; QUAGGIO, J. A.; PROCHNOW, L. I.; VITTI, G. C.; PEREIRA, H. S.	
Afiliação: 	Instituto Agronomico.	
Título: 	Soil testing and plant analysis in Brazil.	
Ano de publicação: 	1994	
Fonte/Imprenta: 	Communications in Soil Science Plant Analysis, v. 25, n.7/8, p.739-751, 1994.	
Idioma: 	Inglês	
Conteúdo: 	Soil testing in Brazil is done by about 180 laboratories, of which 167provided the statistical information used in this paper. There are fewdifferences in analytical  procedures for the macronutrients and soil acidity. All laboratories determine exchangeable Ca, Mg, and K. Two thrids of the laboratories use Meblich No.1 solution to determine  P whereas the other third extract the element from soils with and ion exchange resin procedure, introduced in Brazil in 1983. The pH is determined either in water or in 0.01 M CaCl2. For lime requirement, the analytical data used is either exchangeable aluminium. SMP buffer pH, or cation exchange capacity and soil base saturation. Some laboratories determine also S. micronutrients, clay content, and conductivity.Soil samples analysed increased from 267 thousand   in 1972 to 719 thousand in 1989. Private laboratories increased  their share from 34% to48% in this period. Sao Paulo state had the largest increase in the number of soil samples analyzed during the last decade, increasing from 65 thousand samples in 1982 to 255 thousand samples in 1989. Plant analysis is increasing in importance and about 40 laboratories analyzed around 100 thousand  samples in 1991.	
Palavras-Chave: 	Amostra; Analysis; Laboratorios; Plant; Samples.	
Thesagro: 	Análise; Planta; Solo.	
Thesaurus Nal: 	laboratories; soil; testing.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)	
Exemplares: 	CPAMN-UEPP - (7077-1) - ADP - SP - -- -  -  - 1996.00227 - DIS