Animal manure phosphorus characterization by sequential chemical fractionation, release kinetics and 31P-NMR analysis

• Autor(a) principal: Tiecher,Tales
• Data de Publicação: 2014
• Outros Autores: Zafar,Mohsin, Mallmann,Fábio Joel Kochem, Bortoluzzi,Edson Campanhola, Bender,Marcos Antonio, Ciotti,Lucas Henrique, Santos,Danilo Rheinheimer dos
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista Brasileira de Ciência do Solo (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000500016
• topic: organic amend; phosphorus bioavailability; phytate; phosphorus fractionation

Phosphate release kinetics from manures are of global interest because sustainable plant nutrition with phosphate will be a major concern in the future. Although information on the bioavailability and chemical composition of P present in manure used as fertilizer are important to understand its dynamics in the soil, such studies are still scarce. Therefore, P extraction was evaluated in this study by sequential chemical fractionation, desorption with anion-cation exchange resin and 31P nuclear magnetic resonance (31P-NMR) spectroscopy to assess the P forms in three different dry manure types (i.e. poultry, cattle and swine manure). All three methods showed that the P forms in poultry, cattle and swine dry manures are mostly inorganic and highly bioavailable. The estimated P pools showed that organic and recalcitrant P forms were negligible and highly dependent on the Ca:P ratio in manures. The results obtained here showed that the extraction of P with these three different methods allows a better understanding and complete characterization of the P pools present in the manures.