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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
01/06/2018 |
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Data da última atualização: |
04/01/2019 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BERNARDI, A. C. de C.; SOUZA, G. B. de; VALE, F. |
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Afiliação: |
ALBERTO CARLOS DE CAMPOS BERNARDI, CPPSE; GILBERTO BATISTA DE SOUZA, CPPSE; Fábio Vale, International Potash Institute. |
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Título: |
Polyhalite compared to KCl and gypsum in alfalfa fertilization. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
Electronic International Fertilizer Correspondent (e-ifc) n.52, march, 2018. |
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Páginas: |
7 p. |
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Idioma: |
Inglês |
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Conteúdo: |
Poor acidic soils significantly challenge potassium (K) availability for crop production in Brazil. Therefore, huge amounts of K fertilizers, mostly KCl, are applied yearly. Nevertheless, KCl agronomic efficiency in those soil is often insufficient, hence alternative K donors are sought. In the present study, polyhalite, a natural mineral with potential as a multi-nutrient (11.7, 19, 3.6, and 12.1% of K, sulfur (S), magnesium (Mg), and calcium (Ca), respectively) fertilizer, was examined in a pot-grown (local topsoil) alfalfa (Medicago sativa L.) experiment vs. KCl together with gypsum. Four K application rates (equivalent to 0, 50, 100, and 200 kg K2 O ha?1) were tested with seven fertilizer combinations: KCl; KCl + gypsum1; KCl + gypsum2; polyhalite + KCl (1:7); polyhalite + KCl (1:1); polyhalite + KCl (7:1); and polyhalite. The results of seven successive harvests indicated that K application was essential to obtain considerable plant biomass in a K-rate dependent pattern. Polyhalite application, in combination with KCl or exclusively, gave rise to significantly higher biomass yields than KCl application, with or without gypsum. Polyhalite significantly enhanced K, S, Ca, and Mg uptake, particularly when applied alone at the highest dose. Indications of K-Mg or Cl-S competition seen under KCl application diminished under polyhalite. In conclusion, under the terms of a pot-grown experiment, polyhalite appeared as a promising alternative among K fertilizers for alfalfa grown on Brazilian acidic soils. Polyhalite may be considered as a replacment to KCl as a K source, as well as a donor of Ca, Mg, and S. Broad scale field experiments are required, however, to further confirm this conclusion under practical terms. MenosPoor acidic soils significantly challenge potassium (K) availability for crop production in Brazil. Therefore, huge amounts of K fertilizers, mostly KCl, are applied yearly. Nevertheless, KCl agronomic efficiency in those soil is often insufficient, hence alternative K donors are sought. In the present study, polyhalite, a natural mineral with potential as a multi-nutrient (11.7, 19, 3.6, and 12.1% of K, sulfur (S), magnesium (Mg), and calcium (Ca), respectively) fertilizer, was examined in a pot-grown (local topsoil) alfalfa (Medicago sativa L.) experiment vs. KCl together with gypsum. Four K application rates (equivalent to 0, 50, 100, and 200 kg K2 O ha?1) were tested with seven fertilizer combinations: KCl; KCl + gypsum1; KCl + gypsum2; polyhalite + KCl (1:7); polyhalite + KCl (1:1); polyhalite + KCl (7:1); and polyhalite. The results of seven successive harvests indicated that K application was essential to obtain considerable plant biomass in a K-rate dependent pattern. Polyhalite application, in combination with KCl or exclusively, gave rise to significantly higher biomass yields than KCl application, with or without gypsum. Polyhalite significantly enhanced K, S, Ca, and Mg uptake, particularly when applied alone at the highest dose. Indications of K-Mg or Cl-S competition seen under KCl application diminished under polyhalite. In conclusion, under the terms of a pot-grown experiment, polyhalite appeared as a promising alternative among K fertilizers for alfalfa grow... Mostrar Tudo |
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Palavras-Chave: |
Liberação lenta. |
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Thesagro: |
Absorção de Nutrientes; Acidez do Solo; Cálcio; Enxofre; Magnésio; Medicago Sativa; Potássio. |
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Thesaurus Nal: |
Acid soils. |
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Categoria do assunto: |
W Química e Física |
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Marc: |
LEADER 02480naa a2200265 a 4500
001 2092134
005 2019-01-04
008 2018 bl uuuu u00u1 u #d
100 1 $aBERNARDI, A. C. de C.
245 $aPolyhalite compared to KCl and gypsum in alfalfa fertilization.$h[electronic resource]
260 $c2018
300 $a7 p.
520 $aPoor acidic soils significantly challenge potassium (K) availability for crop production in Brazil. Therefore, huge amounts of K fertilizers, mostly KCl, are applied yearly. Nevertheless, KCl agronomic efficiency in those soil is often insufficient, hence alternative K donors are sought. In the present study, polyhalite, a natural mineral with potential as a multi-nutrient (11.7, 19, 3.6, and 12.1% of K, sulfur (S), magnesium (Mg), and calcium (Ca), respectively) fertilizer, was examined in a pot-grown (local topsoil) alfalfa (Medicago sativa L.) experiment vs. KCl together with gypsum. Four K application rates (equivalent to 0, 50, 100, and 200 kg K2 O ha?1) were tested with seven fertilizer combinations: KCl; KCl + gypsum1; KCl + gypsum2; polyhalite + KCl (1:7); polyhalite + KCl (1:1); polyhalite + KCl (7:1); and polyhalite. The results of seven successive harvests indicated that K application was essential to obtain considerable plant biomass in a K-rate dependent pattern. Polyhalite application, in combination with KCl or exclusively, gave rise to significantly higher biomass yields than KCl application, with or without gypsum. Polyhalite significantly enhanced K, S, Ca, and Mg uptake, particularly when applied alone at the highest dose. Indications of K-Mg or Cl-S competition seen under KCl application diminished under polyhalite. In conclusion, under the terms of a pot-grown experiment, polyhalite appeared as a promising alternative among K fertilizers for alfalfa grown on Brazilian acidic soils. Polyhalite may be considered as a replacment to KCl as a K source, as well as a donor of Ca, Mg, and S. Broad scale field experiments are required, however, to further confirm this conclusion under practical terms.
650 $aAcid soils
650 $aAbsorção de Nutrientes
650 $aAcidez do Solo
650 $aCálcio
650 $aEnxofre
650 $aMagnésio
650 $aMedicago Sativa
650 $aPotássio
653 $aLiberação lenta
700 1 $aSOUZA, G. B. de
700 1 $aVALE, F.
773 $tElectronic International Fertilizer Correspondent (e-ifc)$gn.52, march, 2018.
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