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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia; Embrapa Tabuleiros Costeiros. |
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Data corrente: |
27/06/1995 |
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Data da última atualização: |
27/06/1995 |
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Autoria: |
MILLS, H. A.; BARKER, A. V.; MAYNARD, D. N. |
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Título: |
Ammonia volatilization from soils. |
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Ano de publicação: |
1974 |
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Fonte/Imprenta: |
Agron. J., v.66, p.355-358, 1974. |
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Idioma: |
Inglês
Português |
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Conteúdo: |
If NH4+-N fertilizers are used, most agronomic crops grow best if the soil reaction is near neutrality. Previous studies have shown that if the soil pH becomes alkaline, NH3 volatilization losses of N occurs. The objective of this study was to determine whether or not a rapidly growing crop could reduce the volatilization losses of N, especially from soils above pH 7 to wich large apliccations of NH4+-N ferilizers were made. This study was conducted in a greenhouse using a closed system in which all NH3 evolved from the soil was swept away by a stream of air and collected. The amount of NH3-N evolved from the soils was measured as a function of time, soil pH, amount of N application and presence or absence of corn (Zea mays indentata Bailey) seedings. Ammonia losses with or without plants in the system increased as the soil reaction and amount of NH4+-N application increased. A sharp upward inflection in NH3-N loss occurred at pH 7.2. Plants reduced NH3-N losses by at least 60% in the alkaline soils and by lesser amounts in the acidic and neutral soils. Rapid absorption of NH4+-N by plant root appeared to account for the conservation of N. |
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Palavras-Chave: |
CALAGEM (pH); Solos; Volatização. |
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Thesagro: |
Adubação; Amônia; Milho; Nitrogênio. |
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Thesaurus Nal: |
corn. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01734naa a2200241 a 4500
001 1602199
005 1995-06-27
008 1974 bl --- 0-- u #d
100 1 $aMILLS, H. A.
245 $aAmmonia volatilization from soils.$h[electronic resource]
260 $c1974
520 $aIf NH4+-N fertilizers are used, most agronomic crops grow best if the soil reaction is near neutrality. Previous studies have shown that if the soil pH becomes alkaline, NH3 volatilization losses of N occurs. The objective of this study was to determine whether or not a rapidly growing crop could reduce the volatilization losses of N, especially from soils above pH 7 to wich large apliccations of NH4+-N ferilizers were made. This study was conducted in a greenhouse using a closed system in which all NH3 evolved from the soil was swept away by a stream of air and collected. The amount of NH3-N evolved from the soils was measured as a function of time, soil pH, amount of N application and presence or absence of corn (Zea mays indentata Bailey) seedings. Ammonia losses with or without plants in the system increased as the soil reaction and amount of NH4+-N application increased. A sharp upward inflection in NH3-N loss occurred at pH 7.2. Plants reduced NH3-N losses by at least 60% in the alkaline soils and by lesser amounts in the acidic and neutral soils. Rapid absorption of NH4+-N by plant root appeared to account for the conservation of N.
650 $acorn
650 $aAdubação
650 $aAmônia
650 $aMilho
650 $aNitrogênio
653 $aCALAGEM (pH)
653 $aSolos
653 $aVolatização
700 1 $aBARKER, A. V.
700 1 $aMAYNARD, D. N.
773 $tAgron. J.$gv.66, p.355-358, 1974.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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