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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia; Embrapa Meio Norte / UEP-Parnaíba. |
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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: |
MACDONALD, A. J.; POWLSON, D. S.; POULTON, P. R.; JENKINSON, D. S. |
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Título: |
Unused fertiliser nitrogen in arable soils - Its contribution to nitrate leaching. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
J. Sci. Food Agric., v.46, p.407-419, 1989. |
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Idioma: |
Inglês
Português |
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Conteúdo: |
Nitrate present in arable soils in autumn is at risk to leaching during the following winter. To see whether unused nitrogen fertiliser was a major source of this nitrate. 15N-labelled fertiliser was applied to11 winter wheat crops at rates of between 47 and 234 kg N ha-1 in spring. The experiments were on three contrasting soil types in south-east England. On overage, 17% of the N from spring-applied labelled fertiliser remained in the 0-23cm soil layer at harvest (range, 7-36%) but only a small proportion was in inorganic forms (ammonium + nitrate). This was never more than 5kg N ha-1 and averaged only 1.3% of the fertiliser N applied (range, 0.4-3.6%). Between 79 and 98% of the inorganic N in soils at harvest was unlabelled, being derived from the mineralisation of organic N rather than from unused fertiliser. The amount of unlabelled N was much greater where wheat was grown after ploughing up grass or grass/clover leys than where it was grown in all-arable rotations. When wheat was grown without N fertiliser, soil organicN content at harvest was no lower than in plots given fertiliser at rates up to 234 N ha-1. This work indicates that, for soil growing winter wheat, almost all of the nitrate at risk to leaching over the winterperiod comes from mineralisation of organic N, not from unused fertiliser applied in spring. Consequently, even a drastic reduction in N fertiliser use would have little effect on nitrate leaching. |
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Palavras-Chave: |
15N; ADUBACAO QUIMICA; Fertilisante; Fertiliser; Mineralisation; Nitrate. |
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Thesagro: |
Lixiviação; Mineralização; Nitrato; Nitrogênio; Poluição; Trigo. |
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Thesaurus Nal: |
leaching; nitrogen; pollution; wheat. |
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Categoria do assunto: |
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Marc: |
LEADER 02319naa a2200349 a 4500
001 1614448
005 1995-06-27
008 1989 bl --- 0-- u #d
100 1 $aMACDONALD, A. J.
245 $aUnused fertiliser nitrogen in arable soils - Its contribution to nitrate leaching.
260 $c1989
520 $aNitrate present in arable soils in autumn is at risk to leaching during the following winter. To see whether unused nitrogen fertiliser was a major source of this nitrate. 15N-labelled fertiliser was applied to11 winter wheat crops at rates of between 47 and 234 kg N ha-1 in spring. The experiments were on three contrasting soil types in south-east England. On overage, 17% of the N from spring-applied labelled fertiliser remained in the 0-23cm soil layer at harvest (range, 7-36%) but only a small proportion was in inorganic forms (ammonium + nitrate). This was never more than 5kg N ha-1 and averaged only 1.3% of the fertiliser N applied (range, 0.4-3.6%). Between 79 and 98% of the inorganic N in soils at harvest was unlabelled, being derived from the mineralisation of organic N rather than from unused fertiliser. The amount of unlabelled N was much greater where wheat was grown after ploughing up grass or grass/clover leys than where it was grown in all-arable rotations. When wheat was grown without N fertiliser, soil organicN content at harvest was no lower than in plots given fertiliser at rates up to 234 N ha-1. This work indicates that, for soil growing winter wheat, almost all of the nitrate at risk to leaching over the winterperiod comes from mineralisation of organic N, not from unused fertiliser applied in spring. Consequently, even a drastic reduction in N fertiliser use would have little effect on nitrate leaching.
650 $aleaching
650 $anitrogen
650 $apollution
650 $awheat
650 $aLixiviação
650 $aMineralização
650 $aNitrato
650 $aNitrogênio
650 $aPoluição
650 $aTrigo
653 $a15N
653 $aADUBACAO QUIMICA
653 $aFertilisante
653 $aFertiliser
653 $aMineralisation
653 $aNitrate
700 1 $aPOWLSON, D. S.
700 1 $aPOULTON, P. R.
700 1 $aJENKINSON, D. S.
773 $tJ. Sci. Food Agric.$gv.46, p.407-419, 1989.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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Origem |
Tipo/Formato |
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Registro |
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URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Cerrados; Embrapa Unidades Centrais. |
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Data corrente: |
14/05/2020 |
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Data da última atualização: |
09/07/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
MARCHI, G.; GUELFI-SILVA, D. R.; MALAQUIAS, J. V.; GUILHERME, L. R. G.; SPEHAR, C. R.; MARTINS, E. de S. |
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Afiliação: |
GIULIANO MARCHI, CPAC; Douglas Ramos Guelfi-Silva, Universidade Federal de Lavras - UFLA; JUACI VITORIA MALAQUIAS, CPAC; Luiz Roberto Guimarães Guilherme, Universidade Federal de Lavras - UFLA; Carlos Roberto Spehar, Universidade de Brasília - UnB/Campus Universitário Darcy Ribeiro; EDER DE SOUZA MARTINS, CPAC. |
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Título: |
Solubility and availability of micronutrients extracted from silicate agrominerals. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, v. 55, e00807, 2020. |
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Idioma: |
Inglês |
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Notas: |
Título em português: Solubilidade e disponibilidade de micronutrientes extraídos de agrominerais silicáticos. |
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Conteúdo: |
The objective of this work was to evaluate the solubility of the micronutrients copper, nickel, and zinc, chemically extracted from silicate agrominerals, as alternative sources of potassium for lettuce (Lactuca sativa) and rice (Oryza sativa) cultures, as well as their availability to the plants. The micronutrient contents of five agrominerals (alkaline ultramafic, biotite schist, volcanic breccia, phlogopite schist, and mining by-product from Chapada) were evaluated, after being extracted by the citric acid, hydrochloric acid, diethylenetriaminepentaacetic acid, 3051A, neutral ammonium citrate, and Mehlich-3 methods. The agrominerals, at the doses of 0 (control), 200, 400, and 600 kg ha-1 K, were mixed to soil where lettuce and rice were cultivated. The agrominerals presented a low solubility of Ni, Cu, and Zn, with lower contents in lettuce shoots and rice grains than the corresponding soluble standards in sulfate form. The availability of micronutrients to the plants increased with the use of agrominerals, in comparison with the control. Similarities were observed in micronutrient solubility and availability between the different groups of agrominerals. The solubility and availability of Cu, Ni, and Zn depend on the solubility of the minerals that compose the agrominerals. |
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Palavras-Chave: |
Mining by-product. |
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Thesagro: |
Cobre; Disponibilidade de Nutriente; Níquel; Zinco. |
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Thesaurus NAL: |
Copper; Nickel; Nutrient availability; Zinc. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/213019/1/Solubility-and-availability-of-micronutrients.pdf
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Marc: |
LEADER 02230naa a2200301 a 4500
001 2123771
005 2020-07-09
008 2020 bl uuuu u00u1 u #d
100 1 $aMARCHI, G.
245 $aSolubility and availability of micronutrients extracted from silicate agrominerals.$h[electronic resource]
260 $c2020
500 $aTítulo em português: Solubilidade e disponibilidade de micronutrientes extraídos de agrominerais silicáticos.
520 $aThe objective of this work was to evaluate the solubility of the micronutrients copper, nickel, and zinc, chemically extracted from silicate agrominerals, as alternative sources of potassium for lettuce (Lactuca sativa) and rice (Oryza sativa) cultures, as well as their availability to the plants. The micronutrient contents of five agrominerals (alkaline ultramafic, biotite schist, volcanic breccia, phlogopite schist, and mining by-product from Chapada) were evaluated, after being extracted by the citric acid, hydrochloric acid, diethylenetriaminepentaacetic acid, 3051A, neutral ammonium citrate, and Mehlich-3 methods. The agrominerals, at the doses of 0 (control), 200, 400, and 600 kg ha-1 K, were mixed to soil where lettuce and rice were cultivated. The agrominerals presented a low solubility of Ni, Cu, and Zn, with lower contents in lettuce shoots and rice grains than the corresponding soluble standards in sulfate form. The availability of micronutrients to the plants increased with the use of agrominerals, in comparison with the control. Similarities were observed in micronutrient solubility and availability between the different groups of agrominerals. The solubility and availability of Cu, Ni, and Zn depend on the solubility of the minerals that compose the agrominerals.
650 $aCopper
650 $aNickel
650 $aNutrient availability
650 $aZinc
650 $aCobre
650 $aDisponibilidade de Nutriente
650 $aNíquel
650 $aZinco
653 $aMining by-product
700 1 $aGUELFI-SILVA, D. R.
700 1 $aMALAQUIAS, J. V.
700 1 $aGUILHERME, L. R. G.
700 1 $aSPEHAR, C. R.
700 1 $aMARTINS, E. de S.
773 $tPesquisa Agropecuária Brasileira$gv. 55, e00807, 2020.
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Registro original: |
Embrapa Cerrados (CPAC) |
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