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Biblioteca(s): |
Embrapa Acre; Embrapa Agrobiologia; Embrapa Agropecuária Oeste; Embrapa Algodão; Embrapa Amapá; Embrapa Amazônia Ocidental; Embrapa Amazônia Oriental; Embrapa Arroz e Feijão; Embrapa Clima Temperado; Embrapa Gado de Leite; Embrapa Hortaliças; Embrapa Instrumentação; Embrapa Meio Ambiente; Embrapa Meio Norte / UEP-Parnaíba; Embrapa Meio-Norte; Embrapa Milho e Sorgo; Embrapa Pantanal; Embrapa Rondônia; Embrapa Roraima; Embrapa Semiárido; Embrapa Soja; Embrapa Solos; Embrapa Tabuleiros Costeiros; Embrapa Uva e Vinho. MenosEmbrapa Acre; Embrapa Agrobiologia; Embrapa Agropecuária Oeste; Embrapa Algodão; Embrapa Amapá; Embrapa Amazônia Ocidental; Embrapa Amazônia Oriental; Embrapa Arroz e Feijão; Embrapa Clima Temperado; Embrapa Gado de Leite... Mostrar Todas |
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Data corrente: |
16/07/1992 |
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Data da última atualização: |
26/03/2015 |
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Autoria: |
RAIJ, B. van. |
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Título: |
Gesso agricola na melhoria do ambiente radicular no subsolo. |
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Ano de publicação: |
1988 |
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Fonte/Imprenta: |
São Paulo: Associação Nacional para Difusao de Adubos e Corretivos Agrícolas, 1988. |
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Páginas: |
88 p. |
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Idioma: |
Português |
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Conteúdo: |
This is a review on the use of gypsum as a subsoil ameliorator. Gypsum is a byproduct of the phosphoric acid production that is being recommended as subsoil amendment, aiming to improve deep rooting of crops. However, there is still controversy about its use for this purpose. Large areas of brazilian soils have acid subsoils, with low calcium and high aluminum contents, conditions that constitute chemical bariers for root penetration. The harmful effect of aluminm on root development is well known. Furthermore, the presence of calcium in the root envrironment is essential since this element is not translocated from upper to other parts of the plants. Gypsum, or calcium sulfate, is a soluble salt that, unlike limestone, penetrtes into the subsoil. The most direct effect is an increase in calcium, which provides a decrease of aluminum saturation by a dilution effect. However, several papers report an effect of gypsum in reducing exchangeable aluminum. Possible rasons for this are discussed. Studies in soil solutions and nutrient solutions containing aluminum have shown that aluminum activities present negative relations with root development. On the other hand, gypsum reduces aluminum activity and as such improves root development. Field trials have shown the effect of surface applied gypsum in deepening the roots of cultivated plants in acid subsoils. In some cases this leads to water and nitrate uptake from deeper soil layers. There are also reports of gypsum improving physical properties of acid subsoils. Several experiments show positive effects of gypsum in the increase of yields. However, in some cases a possible effect of sulphur as a nutrient makes it impossible to isolate the effect of gypsum as a subsoil amendment. There are still no criteria available for when and how much gypsum to apply on acid soils. Care should be taken to avoid leaching losses of magnesium and potassium. MenosThis is a review on the use of gypsum as a subsoil ameliorator. Gypsum is a byproduct of the phosphoric acid production that is being recommended as subsoil amendment, aiming to improve deep rooting of crops. However, there is still controversy about its use for this purpose. Large areas of brazilian soils have acid subsoils, with low calcium and high aluminum contents, conditions that constitute chemical bariers for root penetration. The harmful effect of aluminm on root development is well known. Furthermore, the presence of calcium in the root envrironment is essential since this element is not translocated from upper to other parts of the plants. Gypsum, or calcium sulfate, is a soluble salt that, unlike limestone, penetrtes into the subsoil. The most direct effect is an increase in calcium, which provides a decrease of aluminum saturation by a dilution effect. However, several papers report an effect of gypsum in reducing exchangeable aluminum. Possible rasons for this are discussed. Studies in soil solutions and nutrient solutions containing aluminum have shown that aluminum activities present negative relations with root development. On the other hand, gypsum reduces aluminum activity and as such improves root development. Field trials have shown the effect of surface applied gypsum in deepening the roots of cultivated plants in acid subsoils. In some cases this leads to water and nitrate uptake from deeper soil layers. There are also reports of gypsum improving physi... Mostrar Tudo |
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Palavras-Chave: |
Adubacao mineral; Agrícola; Ambiente radicular; ANDA; Chemical; Chemistry propriety; Composição; Correcao; Correção de solos; Corretivos agrícolas; Fertilizantes; Fertilization; Gesso agricola; Improvement; Melhoria; Mineral fertilization; Plant; Propriedade quimica; Propriedades quimicas; Relacao; Relation; Root; Rooting amelioration; Soil physicochemical properties; Solos; Solos ácidos; Subsoils; Substrate; Uso; Uso na agricultura; Vegetal nutrition. |
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Thesagro: |
Acidez; Adsorção; Adubação; Adubo; Agricultura; Gesso; Íon; Lixiviação; Melhoramento; Nitrogênio; Nutrição Vegetal; Pesquisa; Planta; Química; Raiz; Sistema Radicular; Solo; Subsolo. |
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Thesaurus Nal: |
acidity; agriculture; gypsum; nutrition; soil. |
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Categoria do assunto: |
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P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 03803nam a2200769 a 4500
001 1688853
005 2015-03-26
008 1988 bl uuuu 00u1 u #d
100 1 $aRAIJ, B. van.
245 $aGesso agricola na melhoria do ambiente radicular no subsolo.
260 $aSão Paulo: Associação Nacional para Difusao de Adubos e Corretivos Agrícolas$c1988
300 $a88 p.
520 $aThis is a review on the use of gypsum as a subsoil ameliorator. Gypsum is a byproduct of the phosphoric acid production that is being recommended as subsoil amendment, aiming to improve deep rooting of crops. However, there is still controversy about its use for this purpose. Large areas of brazilian soils have acid subsoils, with low calcium and high aluminum contents, conditions that constitute chemical bariers for root penetration. The harmful effect of aluminm on root development is well known. Furthermore, the presence of calcium in the root envrironment is essential since this element is not translocated from upper to other parts of the plants. Gypsum, or calcium sulfate, is a soluble salt that, unlike limestone, penetrtes into the subsoil. The most direct effect is an increase in calcium, which provides a decrease of aluminum saturation by a dilution effect. However, several papers report an effect of gypsum in reducing exchangeable aluminum. Possible rasons for this are discussed. Studies in soil solutions and nutrient solutions containing aluminum have shown that aluminum activities present negative relations with root development. On the other hand, gypsum reduces aluminum activity and as such improves root development. Field trials have shown the effect of surface applied gypsum in deepening the roots of cultivated plants in acid subsoils. In some cases this leads to water and nitrate uptake from deeper soil layers. There are also reports of gypsum improving physical properties of acid subsoils. Several experiments show positive effects of gypsum in the increase of yields. However, in some cases a possible effect of sulphur as a nutrient makes it impossible to isolate the effect of gypsum as a subsoil amendment. There are still no criteria available for when and how much gypsum to apply on acid soils. Care should be taken to avoid leaching losses of magnesium and potassium.
650 $aacidity
650 $aagriculture
650 $agypsum
650 $anutrition
650 $asoil
650 $aAcidez
650 $aAdsorção
650 $aAdubação
650 $aAdubo
650 $aAgricultura
650 $aGesso
650 $aÍon
650 $aLixiviação
650 $aMelhoramento
650 $aNitrogênio
650 $aNutrição Vegetal
650 $aPesquisa
650 $aPlanta
650 $aQuímica
650 $aRaiz
650 $aSistema Radicular
650 $aSolo
650 $aSubsolo
653 $aAdubacao mineral
653 $aAgrícola
653 $aAmbiente radicular
653 $aANDA
653 $aChemical
653 $aChemistry propriety
653 $aComposição
653 $aCorrecao
653 $aCorreção de solos
653 $aCorretivos agrícolas
653 $aFertilizantes
653 $aFertilization
653 $aGesso agricola
653 $aImprovement
653 $aMelhoria
653 $aMineral fertilization
653 $aPlant
653 $aPropriedade quimica
653 $aPropriedades quimicas
653 $aRelacao
653 $aRelation
653 $aRoot
653 $aRooting amelioration
653 $aSoil physicochemical properties
653 $aSolos
653 $aSolos ácidos
653 $aSubsoils
653 $aSubstrate
653 $aUso
653 $aUso na agricultura
653 $aVegetal nutrition
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Registro original: |
Embrapa Roraima (CPAF-RR) |
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