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Registro Completo |
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Biblioteca(s): |
Embrapa Meio Norte / UEP-Parnaíba. |
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Data corrente: |
27/05/1998 |
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Data da última atualização: |
19/12/2011 |
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Autoria: |
GAINES, T. P.; GAINES, S. T. |
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Título: |
Soil texture effect on nitrate leaching in soil percolates. |
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Ano de publicação: |
1994 |
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Fonte/Imprenta: |
Communications in Soil Science and Plant Analysis, v.25, n.13/14, p.2561-2570, 1994. |
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Idioma: |
Inglês |
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Conteúdo: |
Nitrate nitrogen (NO3-N), which is an essential source of nitrogen (N) for plant growth, is now also considered a potential polluatant by the Environmental Protection Agency (EPA). This is because excess applied amounts of NO3-N can move into streams by run-off and into ground water by leaching, thereby becoming an environmental harzard. Soils have varied retentive properties depending on their texture, organic matter content, and cation exchange capacity (CEC). The pupose of this study was to determine the effect of soil texture on NO3-N retention to reduce NO3-N contamination in the environment. A sand. 85:15 sand:peat Greensmix, a loamy sand, and sandy clay loam soils were placed in 2x3 inch metal cylinders and soaked in a 240 ppm solution of N03-N for seven days to saturate the soil with No3 ions. The columms were leached with water to collect 10 soi percolate samples of 50 mL each until a total volume of 500 mL was collected. Nitrate-N was measured in each 50-mL aliquot by automated colorimetry. The results showed that soil texture affected the retention of NO3-N in the sand, which adsorbed the least amount of NO3-N at 119 ppm, followed by the Greensmix at 125 ppm, loamy sand at 149 ppm, and sandy clay loam at 173 ppm. More NO3-N released in the first 50 mL of the sand percolate at 63% followed by the greensmix, loamy sand, and sandy clay loam at 58, 46, and 37% NO3-N released, respectively. Soils with more silt, clay, and organic matter retained more NO3-N than the straight sand. Therefore, a straight sand would be the poorest of soil types since NO3-N retention was low. MenosNitrate nitrogen (NO3-N), which is an essential source of nitrogen (N) for plant growth, is now also considered a potential polluatant by the Environmental Protection Agency (EPA). This is because excess applied amounts of NO3-N can move into streams by run-off and into ground water by leaching, thereby becoming an environmental harzard. Soils have varied retentive properties depending on their texture, organic matter content, and cation exchange capacity (CEC). The pupose of this study was to determine the effect of soil texture on NO3-N retention to reduce NO3-N contamination in the environment. A sand. 85:15 sand:peat Greensmix, a loamy sand, and sandy clay loam soils were placed in 2x3 inch metal cylinders and soaked in a 240 ppm solution of N03-N for seven days to saturate the soil with No3 ions. The columms were leached with water to collect 10 soi percolate samples of 50 mL each until a total volume of 500 mL was collected. Nitrate-N was measured in each 50-mL aliquot by automated colorimetry. The results showed that soil texture affected the retention of NO3-N in the sand, which adsorbed the least amount of NO3-N at 119 ppm, followed by the Greensmix at 125 ppm, loamy sand at 149 ppm, and sandy clay loam at 173 ppm. More NO3-N released in the first 50 mL of the sand percolate at 63% followed by the greensmix, loamy sand, and sandy clay loam at 58, 46, and 37% NO3-N released, respectively. Soils with more silt, clay, and organic matter retained more NO3-N than the s... Mostrar Tudo |
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Palavras-Chave: |
Nitrate; Percolação; Percolation. |
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Thesagro: |
Lençol Freático; Lixiviação; Nitrato; Nitrogênio. |
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Thesaurus Nal: |
groundwater; leaching; nitrogen. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02276naa a2200253 a 4500
001 1079282
005 2011-12-19
008 1994 bl --- 0-- u #d
100 1 $aGAINES, T. P.
245 $aSoil texture effect on nitrate leaching in soil percolates.
260 $c1994
520 $aNitrate nitrogen (NO3-N), which is an essential source of nitrogen (N) for plant growth, is now also considered a potential polluatant by the Environmental Protection Agency (EPA). This is because excess applied amounts of NO3-N can move into streams by run-off and into ground water by leaching, thereby becoming an environmental harzard. Soils have varied retentive properties depending on their texture, organic matter content, and cation exchange capacity (CEC). The pupose of this study was to determine the effect of soil texture on NO3-N retention to reduce NO3-N contamination in the environment. A sand. 85:15 sand:peat Greensmix, a loamy sand, and sandy clay loam soils were placed in 2x3 inch metal cylinders and soaked in a 240 ppm solution of N03-N for seven days to saturate the soil with No3 ions. The columms were leached with water to collect 10 soi percolate samples of 50 mL each until a total volume of 500 mL was collected. Nitrate-N was measured in each 50-mL aliquot by automated colorimetry. The results showed that soil texture affected the retention of NO3-N in the sand, which adsorbed the least amount of NO3-N at 119 ppm, followed by the Greensmix at 125 ppm, loamy sand at 149 ppm, and sandy clay loam at 173 ppm. More NO3-N released in the first 50 mL of the sand percolate at 63% followed by the greensmix, loamy sand, and sandy clay loam at 58, 46, and 37% NO3-N released, respectively. Soils with more silt, clay, and organic matter retained more NO3-N than the straight sand. Therefore, a straight sand would be the poorest of soil types since NO3-N retention was low.
650 $agroundwater
650 $aleaching
650 $anitrogen
650 $aLençol Freático
650 $aLixiviação
650 $aNitrato
650 $aNitrogênio
653 $aNitrate
653 $aPercolação
653 $aPercolation
700 1 $aGAINES, S. T.
773 $tCommunications in Soil Science and Plant Analysis$gv.25, n.13/14, p.2561-2570, 1994.
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Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP) |
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Registro Completo
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
08/10/2003 |
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Data da última atualização: |
08/10/2003 |
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Autoria: |
MEDEIROS, A. C. de S.; ABREU, D. C. A. de. |
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Afiliação: |
Medeiros, pesquisador da Embrapa Florestas, Abreu, estagiária da Embrapa Florestas. |
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Título: |
Efeito da secagem na viabilidade dos embriões de erva mate (Ilex paraguariensis). |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
Informativo ABRATES, Brasília, v. 13, n. 3, p. 324, set. 2003. |
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Idioma: |
Português |
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Notas: |
Edição dos Resumos do XIII Congresso Brasileiro de Sementes, 2003. |
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Palavras-Chave: |
Embriões; Erva mate. |
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Thesagro: |
Ilex Paraguariensis; Secagem. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00592naa a2200181 a 4500
001 1306424
005 2003-10-08
008 2003 bl uuuu u00u1 u #d
100 1 $aMEDEIROS, A. C. de S.
245 $aEfeito da secagem na viabilidade dos embriões de erva mate (Ilex paraguariensis).
260 $c2003
500 $aEdição dos Resumos do XIII Congresso Brasileiro de Sementes, 2003.
650 $aIlex Paraguariensis
650 $aSecagem
653 $aEmbriões
653 $aErva mate
700 1 $aABREU, D. C. A. de
773 $tInformativo ABRATES, Brasília$gv. 13, n. 3, p. 324, set. 2003.
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Embrapa Florestas (CNPF) |
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