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| Rosa-Magri,Márcia Maria; Avansini,Simoni Helena; Lopes-Assad,Maria Leonor; Tauk-Tornisielo,Sâmia Maria; Ceccato-Antonini,Sandra Regina. |
| The alteration of minerals in rocks and the availability of elements for plant nutrition require long periods of time, and microorganisms are thought to induce the release of potassium and phosphate from rocks. In this context, this work evaluates the role of the yeast Torulaspora globosa, isolated from the sugar cane rhizosphere, in the solubilization of potassium from alkaline ultramafic rock powder. The experiments were performed in liquid medium, with or without agitation, at 30°C with the following treatments: culture medium + alkaline ultramafic; culture medium + yeast suspension; and culture medium + yeast suspension + alkaline ultramafic. The results showed that as much as 38% of the total potassium in the rock was released in the medium with the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biosolubilization; Insoluble rocks; Alkaline ultramafic. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000400013 |
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| Marin,Fábio Ricardo; Lopes-Assad,Maria Leonor; Assad,Eduardo Delgado; Vian,Carlos Eduardo; Santos,Marcelo Cabral. |
| A conceptual framework for crop production efficiency was derived using thermodynamic efficiency concept, in order to generate a tool for performance evaluation of agricultural systems and to quantify the interference of determining factors on this performance. In Thermodynamics, efficiency is the ratio between the output and input of energy. To establish this relationship in agricultural systems, it was assumed that the input energy is represented by the attainable crop yield, as predicted through simulation models based on environmental variables. The method of FAO's agroecological zones was applied to the assessment of the attainable sugarcane yield, while Instituto Brasileiro de Geografia e Estatística (IBGE) data were used as observed yield. Sugarcane... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum; Pedological aptitude; Geoprocessing; Agrometeorological modeling. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008001100002 |
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