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https://locus.ufv.br//handle/123456789/24598
Tipo: | Artigo |
Título: | Acid ammonium citrate as p extractor for fertilizers of varying solubility |
Autor(es): | Santos, Wedisson Oliveira Mattiello, Edson Marcio Barreto, Matheus Sampaio Carneiro Cantarutti, Reinaldo Bertola |
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. |
Palavras-chave: | Phosphorus fertilizers Citric acid Ammonium neutral citrate |
Editor: | Revista Brasileira de Ciência do Solo |
Tipo de Acesso: | Open Access |
URI: | http://dx.doi.org/10.1590/18069657rbcs20180072 http://www.locus.ufv.br/handle/123456789/24598 |
Data do documento: | 2019 |
Aparece nas coleções: | Solos - Artigos |
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