| Registro completo |
| Provedor de dados: |
Rev. Bras. Ciênc. Solo
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| País: |
Brazil
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| Título: |
Acid Ammonium Citrate as P Extractor for Fertilizers of Varying Solubility
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| Autores: |
Santos,Wedisson Oliveira
Mattiello,Edson Marcio
Barreto,Matheus Sampaio Carneiro
Cantarutti,Reinaldo Bertola
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| Data: |
2019-01-01
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| Ano: |
2019
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| Palavras-chave: |
Phosphorus fertilizers
Citric acid
Ammonium neutral citrate
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| Resumo: |
ABSTRACT: There are several globally accepted methods to chemically characterize P-fertilizers, but not all are suitable to predict the agronomic efficiency of the P sources in terms of plant nutrition. Our aim was to investigate the performance of P extractors for fertilizers, investigating the consistency of different methods for P sources of varying properties and the related plant responses. The experiment was carried out in a greenhouse, using corn as a model plant. Phosphorus values extractable in water, 2 % citric acid, 2 % formic acid, ammonium neutral citrate + water, and acid ammonium citrate were evaluated for eight P fertilizers of varied solubility and correlated with P uptake by corn. The extractors citric acid and formic acid recovered no predictive amounts of P from crystalline apatite sources (Araxá and Patos phosphate rocks, PRs). However, they showed a satisfactory performance for Bayóvar PR and partially acidulated PRs but extracted low amounts of P from soluble P sources such as superphosphates. Neutral ammonium citrate + water extractors could accurately predict the efficiency of soluble P sources but underestimated the performance of Bayóvar (a reactive PR). In contrast, the extractor acid ammonium citrate, AAC, (pH 3) accurately predicted the agronomic efficiency of all P fertilizers. We therefore suggest AAC as an effective predictor of the agronomic effectiveness of any inorganic phosphorus sources.
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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=S0100-06832019000100503
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| Editor: |
Sociedade Brasileira de Ciência do Solo
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| Relação: |
10.1590/18069657rbcs20180072
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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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