| Registro completo |
| Provedor de dados: |
Rev. Bras. Ciênc. Solo
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| País: |
Brazil
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| Título: |
Does Ferralsol Clay Mineralogy Maintain Potassium Long-Term Supply to Plants?
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| Autores: |
Moterle,Diovane Freire
Bortoluzzi,Edson Campanhola
Kaminski,João
Rheinheimer,Danilo dos Santos
Caner,Laurent
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| Data: |
2019-01-01
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| Ano: |
2019
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| Palavras-chave: |
Potassium forms
K fertilization
Non-exchangeable K
2:1 clay minerals
X-ray diffraction
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| Resumo: |
ABSTRACT Ferralsols ( Latossolos ) should contain few or no 2:1 clay minerals and have low potassium (K) contents, and consequently low levels of non-exchangeable K forms are expected. The aim of this study was to evaluate how the clay mineralogy of a Ferralsol affects the soil K dynamics in response to K fertilization during cropping and whether the clay mineralogy was altered due to successive crops and K fertilization. A tropical Brazilian Ferralsol under field conditions was sampled (0.00-0.20 m) in contrasting K fertilization plots: no K application (control plot) and 3,200 kg ha-1 applied K2O fertilizer. These two treatments were submitted at eight different crop cycles, performed in pots under greenhouse conditions, and fertilized with 0, 30, and 90 mg kg-1 K2O before each crop cycle. The biomass K, exchangeable K, non-exchangeable K, and structural K contents were determined after each crop cycle. At the end of the experiment, the presence of 2:1 clay minerals with hydroxy-aluminum interlayered in the soil clay fraction was verified, which ensured K adsorption in a form available to plants when K fertilizer was added. Cropping without K fertilization resulted in limited crop yields and exhausted the exchangeable and non-exchangeable K soil reserves. The previous K fertilization history influenced the soil K reserve and its availability to plants in the Ferralsol studied. The crops without K addition decreased the proportion of 2:1 hydroxy-Al interlayer minerals in the soil in relation to the kaolinite clay minerals.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100512
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| Editor: |
Sociedade Brasileira de Ciência do Solo
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| Relação: |
10.1590/18069657rbcs20180166
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| Formato: |
text/html
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| Fonte: |
Revista Brasileira de Ciência do Solo v.43 2019
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| Direitos: |
info:eu-repo/semantics/openAccess
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