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| Faria,Letícia de Abreu; Luz,Pedro Henrique de Cerqueira; Macedo,Felipe Barros; Tonetti,Paulo Sergio; Ferraz,Marcos Roberto; Mazza,Jairo Antônio; Vitti,Godofredo Cesar. |
| ABSTRACT High contents of plant-available selenium in the soil in the form of selenate, resulting from natural or anthropogenic action, jeopardizes agricultural areas and requires research for solutions to establish or re-establish agricultural or livestock operation, avoiding the risk of poisoning of plants, animals and humans. The purpose was to evaluate sulfur sources in the form of sulfate, e.g., ammonium sulfate, calcium sulfate, ferric sulfate, in the remediation of tropical soils anthropogenically contaminated with Se under the tropical forage grass Brachiaria brizantha (Hochst. ex A. Rich.) Stapf cv. Marandu. More clayey soils are less able to supply plants with Se, which influences the effects of S sources, but it was found that high soil Se... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Contamination; Selenate; Remediation; Toxicity. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000601814 |
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| Faria,Letícia de Abreu; Luz,Pedro Henrique de Cerqueira; Rodrigues,Rosane Cláudia; Herling,Valdo Rodrigues; Macedo,Felipe Barros. |
| A escória siderúrgica é uma alternativa para a correção da acidez dos solos e é constituída de silicato de cálcio. Neste estudo, avaliaram-se os efeitos residuais da aplicação de silicato de cálcio nos atributos químicos do solo e da planta em Latossolo Vermelho distroférrico típico com capim-Marandu (Brachiaria brizantha cv. Marandu), sob intensidades de pastejo em lotação rotacionada. O delineamento experimental foi de blocos ao acaso, com intensidades de pastejo avaliadas pelas ofertas diárias de forragem de 50, 100, 150 e 200 kg t-1 de MS por PV nas parcelas experimentais, enquanto a aplicação superficial de silicato de cálcio combinado com calcário dolomítico, respectivamente, nas doses 0 + 0; 2 + 0; 4 + 0; 6 + 0; 2 + 4; 4 + 2 e 0 + 6 t ha- 1 nas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forragem; Silicato de cálcio; Silício. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000300029 |
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| Braga,Gustavo José; Pedreira,Carlos Guilherme Silveira; Herling,Valdo Rodrigues; Luz,Pedro Henrique de Cerqueira; Marchesin,Wilson Aparecido; Macedo,Felipe Barros. |
| Indirect, non-destructive methods for estimating herbage mass on pasture may help growers to better estimate herbage mass and manage the grazing process. The objective of this study was to evaluate two methods for estimating herbage mass on Marandu palisadegrass [Brachiaria brizantha (A. Rich.) Stapf] pastures, over two grazing seasons. The relationships between herbage mass and two indirect, non-destructive measurements (sward surface height - SSH and rising plate meter - RP) were analyzed via regression analysis. Mean determination coefficients (r²) for the regression models were 0.82 and 0.91 for RP and SSH, respectively. Time within season influenced both slope (b) and intercept (a) of the regression models in both methods. The change in model... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Brachiaria brizantha; Sward surface height; Herbage allowance; Rising plate meter; Linear regression. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100018 |
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