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| Trintinalha, Marcos Antonio; Gonçalves, Antônio Carlos Andrade; Tormena, Cassio Antonio; Costa, Antonio Carlos Saraiva da; Folegatti, Marcos Vinicius; Freitas, Paulo Sergio Lourenço de; Rezende, Roberto. |
| TDR technique has been intensively applied around the world to measure volumetric soil water content. Although its good results, this system is rather expensive. Other systems have been developed to measure soil dielectric constant or electric potential under lower cost conditions. ECHO system has been used on some soil conditions with good results. For tropical soils conditions, there is no investigation about its application. This work was carried out to evaluate TDR and ECHO applications on a tropical soil Typic Paleudalf, which presents 73% of clay, commonly found at the Northeast region of Paraná, Brazil, and on a “washed sand” material. Mathematic models were fit, by linear regression analyses, to describe relations between soil volumetric water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.00.00.00-4 Ciências Agrárias TDR; Umidade do solo; ECHO; Calibração 5.00.00.00-4 Ciências Agrárias. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1841 |
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| Silva, Maria Anita Gonçalves da; Muniz, Antonio Saraiva; Costa, Antonio Carlos Saraiva da; Cegana, Antonio Cristiano Vieira. |
| The methodologies of micronutrientes analyses have been studied seeking a better expression of its texts in the soils and a larger adaptation to the analyses of routine of the laboratories. The efficiency of the extractors in the determination of the iron was evaluated through the use of acid extractors (Mehlich 1), in the relationship of 1:5 and 1:10, of an agent complexante (DTPA pH 7,3) and of combinated (Mehlich 3), in the relationship 1:10; the determination methodology consisted of agitation with immediate filtrate, filtrate after 16 hours of decantated and pipetate after decantação of 16 hours. The analyses included 18 representative soils of Paraná, collected to a depth of 0-20cm. The results they were appraised through the relationship among the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.00.00.00-4 Ciências Agrárias extratores de ferro; Metodologias de análise; Solos paranaenses 5.00.00.00-4 Ciências Agrárias. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1833 |
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