Absorção de cátions e ânions pelo capim-coastcross adubado com uréia e nitrato de amônio Cations and anions uptake by coastcross grass fertilized with urea and ammonium nitrate
Os processos fisiológicos das plantas são afetados pelo balanço de cátions e ânions absorvidos. O objetivo deste trabalho foi determinar a absorção de cátions e ânions quando plantas de capim-coastcross receberam doses elevadas de nitrogênio. O delineamento experimental foi o de blocos casualizados...
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Embrapa Informação Tecnológica
2005-03-01
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| Series: | Pesquisa Agropecuária Brasileira |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000300008 |
| _version_ | 1818253876963311616 |
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| author | Ana Cândida Primavesi Odo Primavesi Luciano Almeida Corrêa Heitor Cantarella Aliomar Gabriel da Silva |
| author_facet | Ana Cândida Primavesi Odo Primavesi Luciano Almeida Corrêa Heitor Cantarella Aliomar Gabriel da Silva |
| author_sort | Ana Cândida Primavesi |
| collection | DOAJ |
| description | Os processos fisiológicos das plantas são afetados pelo balanço de cátions e ânions absorvidos. O objetivo deste trabalho foi determinar a absorção de cátions e ânions quando plantas de capim-coastcross receberam doses elevadas de nitrogênio. O delineamento experimental foi o de blocos casualizados com quatro repetições, num esquema fatorial 2x5 - duas fontes de N: uréia e nitrato de amônio, e cinco doses de N: 0, 25, 50, 100, 200 kg ha-1 corte-1 . As doses de N foram aplicadas após cada corte num total de cinco cortes, durante a época das chuvas. A absorção de cátions e de ânions pelo capim-coastcross aumentou com o acréscimo das doses de N dos dois fertilizantes, sendo maior com o nitrato de amônio. Com doses crescentes de N, verificou-se entre os cátions maior absorção do K+, e do Cl- entre os ânions. Com exceção do N, a absorção do K+ foi superior à dos demais nutrientes, com redução no teor relativo de cálcio. Doses altas de N aplicadas em capim-coastcross, na forma de uréia ou de nitrato de amônio, favorecem a absorção de cátions e de ânions.<br>Physiologic processes of plants are affected by uptake of cations and anions. The aim of this work was to determine the uptake of cations and anions when plants of coastcross grass received high doses of nitrogen. The experimental design was a randomized block, in a 2x5 factorial arrangement - two N sources: urea and ammonium nitrate and five N rates: 0, 25, 50, 100, and 200 kg ha-1 cutting-1 - with four replications. Treatments were applied after each of five consecutive cutting in the rainy season. Uptake of cations and anions by coastcross grass increased with increasing of N rates with both fertilizers, but was higher with ammonium nitrate. Increasing rates of N caused higher K+ uptake in relation to other cations, and in Cl- among the anions. Except for N, K+ uptake was greater than that of other nutrients, with a reduction on the relative content of Ca2+. High doses of N as urea or ammonium nitrate applied on coastcross grass favor absorption of cations and anions. |
| first_indexed | 2024-12-12T16:47:03Z |
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| id | doaj.art-1423e7ee0cd94e4f903deb76952af199 |
| institution | Directory Open Access Journal |
| issn | 0100-204X 1678-3921 |
| language | English |
| last_indexed | 2024-12-12T16:47:03Z |
| publishDate | 2005-03-01 |
| publisher | Embrapa Informação Tecnológica |
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| series | Pesquisa Agropecuária Brasileira |
| spelling | doaj.art-1423e7ee0cd94e4f903deb76952af1992022-12-22T00:18:27ZengEmbrapa Informação TecnológicaPesquisa Agropecuária Brasileira0100-204X1678-39212005-03-0140324725310.1590/S0100-204X2005000300008Absorção de cátions e ânions pelo capim-coastcross adubado com uréia e nitrato de amônio Cations and anions uptake by coastcross grass fertilized with urea and ammonium nitrateAna Cândida PrimavesiOdo PrimavesiLuciano Almeida CorrêaHeitor CantarellaAliomar Gabriel da SilvaOs processos fisiológicos das plantas são afetados pelo balanço de cátions e ânions absorvidos. O objetivo deste trabalho foi determinar a absorção de cátions e ânions quando plantas de capim-coastcross receberam doses elevadas de nitrogênio. O delineamento experimental foi o de blocos casualizados com quatro repetições, num esquema fatorial 2x5 - duas fontes de N: uréia e nitrato de amônio, e cinco doses de N: 0, 25, 50, 100, 200 kg ha-1 corte-1 . As doses de N foram aplicadas após cada corte num total de cinco cortes, durante a época das chuvas. A absorção de cátions e de ânions pelo capim-coastcross aumentou com o acréscimo das doses de N dos dois fertilizantes, sendo maior com o nitrato de amônio. Com doses crescentes de N, verificou-se entre os cátions maior absorção do K+, e do Cl- entre os ânions. Com exceção do N, a absorção do K+ foi superior à dos demais nutrientes, com redução no teor relativo de cálcio. Doses altas de N aplicadas em capim-coastcross, na forma de uréia ou de nitrato de amônio, favorecem a absorção de cátions e de ânions.<br>Physiologic processes of plants are affected by uptake of cations and anions. The aim of this work was to determine the uptake of cations and anions when plants of coastcross grass received high doses of nitrogen. The experimental design was a randomized block, in a 2x5 factorial arrangement - two N sources: urea and ammonium nitrate and five N rates: 0, 25, 50, 100, and 200 kg ha-1 cutting-1 - with four replications. Treatments were applied after each of five consecutive cutting in the rainy season. Uptake of cations and anions by coastcross grass increased with increasing of N rates with both fertilizers, but was higher with ammonium nitrate. Increasing rates of N caused higher K+ uptake in relation to other cations, and in Cl- among the anions. Except for N, K+ uptake was greater than that of other nutrients, with a reduction on the relative content of Ca2+. High doses of N as urea or ammonium nitrate applied on coastcross grass favor absorption of cations and anions.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000300008Cynodon dactylonabsorção de nutrientesadubos nitrogenadosCynodon dactylonnutrients absorptionnitrogen fertilizers |
| spellingShingle | Ana Cândida Primavesi Odo Primavesi Luciano Almeida Corrêa Heitor Cantarella Aliomar Gabriel da Silva Absorção de cátions e ânions pelo capim-coastcross adubado com uréia e nitrato de amônio Cations and anions uptake by coastcross grass fertilized with urea and ammonium nitrate Pesquisa Agropecuária Brasileira Cynodon dactylon absorção de nutrientes adubos nitrogenados Cynodon dactylon nutrients absorption nitrogen fertilizers |
| title | Absorção de cátions e ânions pelo capim-coastcross adubado com uréia e nitrato de amônio Cations and anions uptake by coastcross grass fertilized with urea and ammonium nitrate |
| title_full | Absorção de cátions e ânions pelo capim-coastcross adubado com uréia e nitrato de amônio Cations and anions uptake by coastcross grass fertilized with urea and ammonium nitrate |
| title_fullStr | Absorção de cátions e ânions pelo capim-coastcross adubado com uréia e nitrato de amônio Cations and anions uptake by coastcross grass fertilized with urea and ammonium nitrate |
| title_full_unstemmed | Absorção de cátions e ânions pelo capim-coastcross adubado com uréia e nitrato de amônio Cations and anions uptake by coastcross grass fertilized with urea and ammonium nitrate |
| title_short | Absorção de cátions e ânions pelo capim-coastcross adubado com uréia e nitrato de amônio Cations and anions uptake by coastcross grass fertilized with urea and ammonium nitrate |
| title_sort | absorcao de cations e anions pelo capim coastcross adubado com ureia e nitrato de amonio cations and anions uptake by coastcross grass fertilized with urea and ammonium nitrate |
| topic | Cynodon dactylon absorção de nutrientes adubos nitrogenados Cynodon dactylon nutrients absorption nitrogen fertilizers |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000300008 |
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