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Registro Completo |
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Biblioteca(s): |
Embrapa Meio Norte / UEP-Parnaíba. |
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Data corrente: |
05/01/1996 |
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Data da última atualização: |
05/01/1996 |
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Autoria: |
CLAY, D. E.; CLAPP, C. E.; DOWDY, R. H.; MOLINA, J. A. E. |
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Afiliação: |
USDA-ARS. |
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Título: |
Mineralization of nitrogen in fertilizer-acidified lime-amended soils. |
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Ano de publicação: |
1993 |
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Fonte/Imprenta: |
Biology and Fertility of Soils, v.15, p.249-252, 1993. |
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Idioma: |
Inglês |
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Conteúdo: |
The application of NH4+-based fertilizers to soils slowly lowers soil pH,which in turn decreases nitrification rates. Under these conditionsnitrification and mineralization may be reduced. We therefore investigated the impact of liming fertilizer-acidified soils on nitrification and N mineralization. Soil samples were collected in the spring of 1987 from a field experiment, initiated in 1980, investigating N, tillage,and residue management under continuous corn (Zea mays L.). The pH values (CaCl2) in the surface soil originally ranged from 6.0 to 6.5. After 6 years the N fertilizer and tillage treatments had reduced the soil pH to values that ranged between 3.7 and 6.2. Incubation treatmentsincluded two liming rates(unlimed or SMP-determined lime requirement),two 15N-labeled fertilizer rates (0 or 20g N m-2), and three replicates. Field-moist soil was mixed with lime and packed by original depth into columns. labeled-15N ammonium sulfate in solution was surface-applied and columns were leached with 1,5 pore volumes of deionized water every 7 days over a 70-day period. Nitrification occurred in all pH treatments, suggesting that a fertilizer-acidified soil must contain a low-pH tolerant nitrifier population. Liming increased soil pH values (CaCl2) from 3,7 to 6,2, and increased by 10% (1,5g Nm-2) the the amount of soil-derived NO3-N that moved through the columns. This increase was the result of enhanced movement of soil-derived NO3-N through the columns during the first 14 days of incubation. After the initial... MenosThe application of NH4+-based fertilizers to soils slowly lowers soil pH,which in turn decreases nitrification rates. Under these conditionsnitrification and mineralization may be reduced. We therefore investigated the impact of liming fertilizer-acidified soils on nitrification and N mineralization. Soil samples were collected in the spring of 1987 from a field experiment, initiated in 1980, investigating N, tillage,and residue management under continuous corn (Zea mays L.). The pH values (CaCl2) in the surface soil originally ranged from 6.0 to 6.5. After 6 years the N fertilizer and tillage treatments had reduced the soil pH to values that ranged between 3.7 and 6.2. Incubation treatmentsincluded two liming rates(unlimed or SMP-determined lime requirement),two 15N-labeled fertilizer rates (0 or 20g N m-2), and three replicates. Field-moist soil was mixed with lime and packed by original depth into columns. labeled-15N ammonium sulfate in solution was surface-applied and columns were leached with 1,5 pore volumes of deionized water every 7 days over a 70-day period. Nitrification occurred in all pH treatments, suggesting that a fertilizer-acidified soil must contain a low-pH tolerant nitrifier population. Liming increased soil pH values (CaCl2) from 3,7 to 6,2, and increased by 10% (1,5g Nm-2) the the amount of soil-derived NO3-N that moved through the columns. This increase was the result of enhanced movement of soil-derived NO3-N through the columns during the first 14 d... Mostrar Tudo |
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Palavras-Chave: |
Nitrate. |
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Thesagro: |
Mineralização; Nitrato; Nitrificação; Nitrogênio; Ph; Zea Mays. |
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Thesaurus Nal: |
mineralization; nitrification; nitrogen. |
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Categoria do assunto: |
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Marc: |
LEADER 02244naa a2200277 a 4500
001 1075596
005 1996-01-05
008 1993 bl --- 0-- u #d
100 1 $aCLAY, D. E.
245 $aMineralization of nitrogen in fertilizer-acidified lime-amended soils.
260 $c1993
520 $aThe application of NH4+-based fertilizers to soils slowly lowers soil pH,which in turn decreases nitrification rates. Under these conditionsnitrification and mineralization may be reduced. We therefore investigated the impact of liming fertilizer-acidified soils on nitrification and N mineralization. Soil samples were collected in the spring of 1987 from a field experiment, initiated in 1980, investigating N, tillage,and residue management under continuous corn (Zea mays L.). The pH values (CaCl2) in the surface soil originally ranged from 6.0 to 6.5. After 6 years the N fertilizer and tillage treatments had reduced the soil pH to values that ranged between 3.7 and 6.2. Incubation treatmentsincluded two liming rates(unlimed or SMP-determined lime requirement),two 15N-labeled fertilizer rates (0 or 20g N m-2), and three replicates. Field-moist soil was mixed with lime and packed by original depth into columns. labeled-15N ammonium sulfate in solution was surface-applied and columns were leached with 1,5 pore volumes of deionized water every 7 days over a 70-day period. Nitrification occurred in all pH treatments, suggesting that a fertilizer-acidified soil must contain a low-pH tolerant nitrifier population. Liming increased soil pH values (CaCl2) from 3,7 to 6,2, and increased by 10% (1,5g Nm-2) the the amount of soil-derived NO3-N that moved through the columns. This increase was the result of enhanced movement of soil-derived NO3-N through the columns during the first 14 days of incubation. After the initial...
650 $amineralization
650 $anitrification
650 $anitrogen
650 $aMineralização
650 $aNitrato
650 $aNitrificação
650 $aNitrogênio
650 $aPh
650 $aZea Mays
653 $aNitrate
700 1 $aCLAPP, C. E.
700 1 $aDOWDY, R. H.
700 1 $aMOLINA, J. A. E.
773 $tBiology and Fertility of Soils$gv.15, p.249-252, 1993.
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Registro original: |
Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP) |
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