Data/hora: 18/05/2024 06:17:45

Biblioteca(s): 	Embrapa Solos.	
Data corrente: 	22/11/2002	
Data da última atualização: 	22/11/2002	
Autoria: 	CASTILLO, R. B.	
Título: 	Evaluation of soil test methods for the analyses of zinc and boron.	
Ano de publicação: 	1979	
Fonte/Imprenta: 	Los Banos: University of the Philippines, 1979.	
Páginas: 	177p.	
Idioma: 	Inglês	
Notas: 	Tese Mestrado.	
Conteúdo: 	The relative suitability of zinc test methods namely, 0,1N HC1, 1% aq. disodiumethylenediaminetraacetate (NaEDTA), diethylenetriaminepentaacetic acid (DTPA) and ammonium acetate-diphenylthiocarbazone (Dithizone) were evaluated in greenhouse and laboratory experiments using San Manuel sandy clay loam, Luisiana clay, Alaminos loam and Calumpang clay.Different amounts of zinc were extracted by the four methods from each of the soil studied. the suitability of the methods in terms of the correlation with plant zinc over all soils folloes the order DTPA > 0.1N 0.1N HC1 > 1% aq. Na2 EDTA > 0.1N HC1. With regards to reproducibility as indicated by the standard deviation and coefficiente of variation, the methods are ranked as DTPA > 0.1N HC1 > 1% aq. Na2EDTA> Dithizone. The efficiency of hot water and 0.1 N H2SO4 to extract boron, and the suitability of curcumin and quinalizarin methods to colorimetrically determine boron from the extracts were also studied on the same soil types. The hot water method is as good as the 0.1 N H2 S=4 method. The correlation coefficients of test values with boron contents of plants are 0.870, 0.840, 0.875 and 0.877 respectively, for water soluble boron curcumin and acid soluble boron quinalizarin. As shown by greater increases in test values per ppm B applied, the WSB-curcumin method was more sensitive than WSB-quinalizarin. On the other hand, with ASB extraction, quinalizarin color development imparted greater sensivity than cucumin method. In terms of reproducibility, the methods..........	
Palavras-Chave: 	Analise de boro; Analise de zinco; Metodos; Solos.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Solos (CNPS)	
Exemplares: 	CNPS - (4175-1) - ADD - TS - -- - 79015 - CAS/79 - 1997.01006 - DIS