Re-evaluation of manganese solubility as affected by soil sample preparation in the laboratory
Laboratory experiments were conducted to re-evaluate the effects of drying and the time between drying and Mn analysis on soil Mn solubility using maize seedlings as test plant. Samples of five soil types were collected in the field, transferred to laboratory and submitted for the following treatmen...
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| Format: | Article |
| Language: | English |
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Instituto de Tecnologia do Paraná (Tecpar)
2005-07-01
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| Series: | Brazilian Archives of Biology and Technology |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000500017 |
| _version_ | 1818354126366441472 |
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| author | Emilene Andrade Mário Miyazawa Marcos Antonio Pavan Edson Lima de Oliveira |
| author_facet | Emilene Andrade Mário Miyazawa Marcos Antonio Pavan Edson Lima de Oliveira |
| author_sort | Emilene Andrade |
| collection | DOAJ |
| description | Laboratory experiments were conducted to re-evaluate the effects of drying and the time between drying and Mn analysis on soil Mn solubility using maize seedlings as test plant. Samples of five soil types were collected in the field, transferred to laboratory and submitted for the following treatments: dried in the shade at 25ºC and dried at 65ºC followed by Mn determination immediately and after 30 and 60 days. Ninety days later soil samples were rewetted at field capacity and maize seedlings were grown for 7 days. Evaluations included plant Mn content and soil Mn extracted with NH4OAc 1 mol L-1 pH 7. The lowest soil and plant Mn contents were found in soil samples dried in the shade at 25ºC. Drying soil sample at 65ºC and increasing the time between drying and Mn analysis increased Mn solubility and Mn uptake by maize. Oxisols showed higher soil and plant Mn contents than other soil types. The results indicated the extreme difficulty in interpreting soil Mn results due to the great effect of soil processes in the laboratory on Mn solubility. Routine soil analysis is not recommended to evaluate plant available Mn.<br>Avaliou-se em condições de laboratório os efeitos da secagem da amostra de solo e do tempo entre a secagem e a determinação analítica na solubilidade do Mn, utilizando-se milho como planta indicadora. Coletaram-se amostras de cinco solos agrícolas, transferiram-se para o laboratório onde foram submetidas aos seguintes tratamentos: secas a sombra a 25ºC, secas a 65ºC determinando-se o Mn imediatamente, aos 30 e 60 dias. Após 90 dias reumedeceu-se os solos e cultivou-se plantas de milho durante 7 dias. Avaliações incluem Mn-planta e Mn-solo extraído com a solução de NH4AOc 1mol L-1 pH7.0. Amostras de solo secas à sombra apresentaram os menores teores de Mn no solo e nos tecidos das plantas. A secagem do solo a 65ºC e o tempo entre a secagem e a determinação aumentaram a solubilidade de Mn no solo e a absorção de Mn pelas plantas. Os oxisolos e o alfisolo apresentaram os maiores teores de Mn. Os resultados indicaram a extrema dificuldade na interpretação analítica de Mn no solo para fins de fertilidade, devido aos efeitos do preparo da amostra no laboratório na solubilidade do Mn. Analise rotineira de solo deve ser usada com ressalvas para avaliação da disponibilidade de Mn para as plantas. |
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| institution | Directory Open Access Journal |
| issn | 1516-8913 1678-4324 |
| language | English |
| last_indexed | 2024-12-13T19:20:28Z |
| publishDate | 2005-07-01 |
| publisher | Instituto de Tecnologia do Paraná (Tecpar) |
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| series | Brazilian Archives of Biology and Technology |
| spelling | doaj.art-bbcebaa4cff74220b58b2045c77986af2022-12-21T23:34:10ZengInstituto de Tecnologia do Paraná (Tecpar)Brazilian Archives of Biology and Technology1516-89131678-43242005-07-0148464364610.1590/S1516-89132005000500017Re-evaluation of manganese solubility as affected by soil sample preparation in the laboratoryEmilene AndradeMário MiyazawaMarcos Antonio PavanEdson Lima de OliveiraLaboratory experiments were conducted to re-evaluate the effects of drying and the time between drying and Mn analysis on soil Mn solubility using maize seedlings as test plant. Samples of five soil types were collected in the field, transferred to laboratory and submitted for the following treatments: dried in the shade at 25ºC and dried at 65ºC followed by Mn determination immediately and after 30 and 60 days. Ninety days later soil samples were rewetted at field capacity and maize seedlings were grown for 7 days. Evaluations included plant Mn content and soil Mn extracted with NH4OAc 1 mol L-1 pH 7. The lowest soil and plant Mn contents were found in soil samples dried in the shade at 25ºC. Drying soil sample at 65ºC and increasing the time between drying and Mn analysis increased Mn solubility and Mn uptake by maize. Oxisols showed higher soil and plant Mn contents than other soil types. The results indicated the extreme difficulty in interpreting soil Mn results due to the great effect of soil processes in the laboratory on Mn solubility. Routine soil analysis is not recommended to evaluate plant available Mn.<br>Avaliou-se em condições de laboratório os efeitos da secagem da amostra de solo e do tempo entre a secagem e a determinação analítica na solubilidade do Mn, utilizando-se milho como planta indicadora. Coletaram-se amostras de cinco solos agrícolas, transferiram-se para o laboratório onde foram submetidas aos seguintes tratamentos: secas a sombra a 25ºC, secas a 65ºC determinando-se o Mn imediatamente, aos 30 e 60 dias. Após 90 dias reumedeceu-se os solos e cultivou-se plantas de milho durante 7 dias. Avaliações incluem Mn-planta e Mn-solo extraído com a solução de NH4AOc 1mol L-1 pH7.0. Amostras de solo secas à sombra apresentaram os menores teores de Mn no solo e nos tecidos das plantas. A secagem do solo a 65ºC e o tempo entre a secagem e a determinação aumentaram a solubilidade de Mn no solo e a absorção de Mn pelas plantas. Os oxisolos e o alfisolo apresentaram os maiores teores de Mn. Os resultados indicaram a extrema dificuldade na interpretação analítica de Mn no solo para fins de fertilidade, devido aos efeitos do preparo da amostra no laboratório na solubilidade do Mn. Analise rotineira de solo deve ser usada com ressalvas para avaliação da disponibilidade de Mn para as plantas.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000500017Micronutrienttransition metalsoil analysis |
| spellingShingle | Emilene Andrade Mário Miyazawa Marcos Antonio Pavan Edson Lima de Oliveira Re-evaluation of manganese solubility as affected by soil sample preparation in the laboratory Brazilian Archives of Biology and Technology Micronutrient transition metal soil analysis |
| title | Re-evaluation of manganese solubility as affected by soil sample preparation in the laboratory |
| title_full | Re-evaluation of manganese solubility as affected by soil sample preparation in the laboratory |
| title_fullStr | Re-evaluation of manganese solubility as affected by soil sample preparation in the laboratory |
| title_full_unstemmed | Re-evaluation of manganese solubility as affected by soil sample preparation in the laboratory |
| title_short | Re-evaluation of manganese solubility as affected by soil sample preparation in the laboratory |
| title_sort | re evaluation of manganese solubility as affected by soil sample preparation in the laboratory |
| topic | Micronutrient transition metal soil analysis |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000500017 |
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