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| Areias,Rogeria Gregio de Biase Martins; Paiva,Diogo Mendes de; Souza,Sonia Regina; Fernandes,Manlio Silvestre. |
| Em experimentos em casa de vegetação e câmara de crescimento, estudou-se o possível aparecimento de réplicas em 20 variedades crioulas de arroz do Maranhão, mantidas no Banco Ativo de Germoplasma (BAG), do Centro Nacional de Pesquisa em Arroz e Feijão (CNPAF). As vinte variedades, divididas em seis grupos, com nomes similares e números de acessos diferentes no BAG foram avaliadas quanto à similaridade morfológica e molecular. As características morfológicas foram avaliadas e utilizadas para a construção de um dendrograma de similaridade. Após a colheita determinou-se o teor de proteína bruta dos grãos. No experimento em câmara de crescimento além das vinte variedades, utilizou-se a cultivar melhorada (IAC47). O DNA da parte aérea dessas plantas foi... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Similaridade genética; Características morfológicos; RAPD; Proteína bruta dos grãos. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052006000100004 |
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| Paiva,Diogo Mendes de; Cantarutti,Reinaldo Bertola; Guimarães,Gelton Geraldo Fernandes; Silva,Ivo Ribeiro da. |
| Urea is the most consumed nitrogen fertilizer in the world. However, its agronomic and economic efficiency is reduced by the volatilization of NH3, which can reach 78 % of the applied nitrogen. The coating of urea granules with acidic compounds obtained by charcoal oxidation has the potential to reduce the volatilization, due to the acidic character, the high buffering capacity and CEC. This work aimed to evaluate the effect of HNO3-oxidized carbon on the control of NH3 volatilization. These compounds were obtained by oxidation of Eucalyptus grandis charcoal, produced at charring temperatures of 350 and 450 ºC, with 4.5 mol L-1 HNO3. The charcoal was oxidized by solubilization in acidic or alkaline medium, similar to the procedure of soil organic matter... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fertilizer; Nitrogen; Urease. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000400016 |
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| Paiva,Diogo Mendes de; Guimarães,Gelton Geraldo Fernandes; Teixeira,Breno Cardoso; Cantarutti,Reinaldo Bertola. |
| ABSTRACT Functionalized charcoal (CHox) incorporated into urea is known for its ability to reduce NH3 volatilization and increase agronomic efficiency. However, it is important to optimize the functionalization process and to elucidate its relationship with the physicochemical properties of CHox for N supply. Thus, charcoal obtained from eucalyptus wood was functionalized with different HNO3 concentrations and reaction times. Ammonia adsorption by CHox was evaluated in chambers with high NH3 concentrations. Dry matter yield, N uptake, and apparent N recovery efficiency of corn plants were evaluated after the application of the urea-CHox mixture to soil in a greenhouse experiment. The properties of CHox, such as pH, isoelectric point, and total acidity... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biochar; NH3 adsorption; NH3 volatilization; Efficient fertilization. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100305 |
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