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| Abreu Jr.,Cássio Hamilton; Muraoka,Takashi; Lavorante,André Fernando. |
| In soils of tropical climate regions the high acidity and the presence of exchangeable aluminum (Al3+), associated to low fertility, are the main restrainting factors for agricultural production. A laboratory experiment was conducted using 26 soils of different Brazilian regions, to investigate soil acidity components, giving emphasis to Al and their relations with chemical properties. The pH correlated positively with P, Ca, Mg, K, BS, CEC and V% values, and negatively with Al saturation. The Al3+ was the predominant exchangeable cation in 32% of the soils with pH below 5.6. The KCl titratable H+ represents the hydroxi-Al(OH)x complex with low stability and the Wolf-Morgan extracted Al corresponds to the exchangeable + non-exchangeable Al species. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Total acidity; Exchangeable acidity; PH; Aluminum in soil. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200019 |
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| Cruz-Bolivar,Jennifer Tatiana; Rodríguez-Pérez,Wilson; Suárez-Salazar,Juan Carlos; Ordoñez-Espinosa,Claudia Mercedes; Vega-Cano,Gustavo Adolfo. |
| Abstract The composition of minority compounds in samples of roasted and ground coffee (Coffea arabica var. caturra) cultivated in three altitudinal ranges 1300-1400, 1400-1600, 1600-1800 m. a. s. l., in the Huila department of Colombia were determined. The samples were collected in July of 2012. pH, total acidity and total lipids were measured. Subsequently, the composition of total lipids after esterification and gas chromatography analysis coupled to high resolution mass spectrometry (GC-MS) was established. Quality cup test considering the following attributes: fragrance/aroma, taste, residual flavor, acidity, body, uniformity, balance, clean cup, sweetness, quality and note, were performed. No statistically significant difference (p <0.05) in pH,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Attributes; GC-MS; PH; Quality cup test; Total acidity; Total lipids. |
| Ano: 2017 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000200221 |
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