Data/hora: 01/06/2024 00:56:18

Biblioteca(s): 	Embrapa Cerrados; Embrapa Meio Norte / UEP-Parnaíba; Embrapa Rondônia; Embrapa Semiárido.	
Data corrente: 	28/07/1994	
Data da última atualização: 	12/12/2012	
Autoria: 	RAIJ, B. van.	
Título: 	Avaliação da fertilidade do solo.	
Edição: 	3. ed.	
Ano de publicação: 	1987	
Fonte/Imprenta: 	Piracicaba: Instituto da Potassa & Fosfato, 1987.	
Páginas: 	142 p.	
Idioma: 	Português	
Conteúdo: 	The evaluation of soil fertility as it is nowaday practiced in Brazil is described in this publication. In chapter 2 some aspects of the soil constitution are discussed, including a definition of soil, particle size distribution, porosity and aggregation, water retention, aeration, soil minerals and organic matter. The subjects of chapter 3 are soil solution, retention and exchange of ions, origin of ion exchange, cation-exchange equilibrium adsorption of phosphate and biological processes involving nitrogen. In chapter 4 the discussion deals with the concepts on availability of nutrients in soils, response curves, the "law of nimimum", the "law of diminishing increments", the percentage of sufficiency, the mobility of nutrients, interaction of production factors and the most economical amounts of fertilizers. In chapter 5 some aspects of experiments with plants, statistical analysis of experimental results, soil testing and plants analysis are discussed. The steps of a soil testing program include sampling, selection of methods of analysis, correlations between crop responses and results of soil analysis, establisment of classes for interpretation of results and levels of fertilization. Under acidity and liming, in chapter 6, concepts and origin of soil acidity are discussed. The determination of lime requirement is based on, either of three methods, based on the neutralization of aluminum, the increase of soil pH or the increase of base saturation of the cation exchange capacity. In chapter 7 factors affecting the availability of phosphorus and methods for the extraction of soil P are discussed. The correlation between soil P and crop responses to applied phosphorus is shown for soybean, corn and sugar cane and response curves are given for the two first crops to applied phosphorus. The availability of potassium, calcium and magnesium is discussed in chapter 8. Correlations between exchangeable K and crop responses to applied potassium are given for corn, cotton, beans, sugar cane and soybean. The difficulties of soil testing for nitrogen are discussed in chapter 9. Responses of cotton and corn to applied nitrogen. Could not be correlated with soil organic matter. Response curves to nitrogen are shown for sugar cane, corn, beans, cotton and wheat. Practical aspects of the use of soil testing are discussed in chapter 10, concerning informations that should be considered, laboratories, sampling problems, interpretation of the results, implementation of the recommendations and expected variation in soil test results with liming and fertilization.	
Palavras-Chave: 	CORRETIVA; FOSFATOS; MATERIA; METODOS; NUTRIENTES; ORGANICA.	
Thesagro: 	Absorção; Acidez; Adsorção; Adubação; Aeração; Análise; Calagem; Cálcio; Fertilidade; Fósforo; Granulometria; Magnésio; Nitrogênio; Potássio; Solo.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Cerrados (CPAC)	
Exemplares: 	CPAMN-UEPP - (3449-1) - ADD - LV - PP - 631.422 - R149a - LV301/1988 - DIS
CPAC - (23497-1) - ADD - LV - PP - 631.422 - R149a - 2003.00333 - DIS
CPATSA - (42358-1) - ADD - LV - PP - 631.422 - R149a - 1987.00408 - DIS
CPAF-RO - (12327-1) - ADD - LV - -- - 631.422 - R149a - 21.94 - DIS