Título:	Phosphorus fractions in a lowland production system in subtropical soil under no-tillage
Autor:	SOUZA, R. de O. SILVA, J. B. da SCIVITTARO, W. B. PASA, E. H. CARLOS, F. S.
Afiliación:	ROGÉRIO OLIVEIRA DE SOUSA, UNIVERSIDADE FEDERAL DE PELOTAS; JULIANA BRITO DA SILVA, UNIVERSIDADE FEDERAL DE PELOTAS; WALKYRIA BUENO SCIVITTARO, CPACT; EZEQUIEL HELBIG PASA, UNIVERSIDADE FEDERAL DE PELOTAS; FILIPE SELAU CARLOS, UNIVERSIDADE FEDERAL DE PELOTAS.
Año:	2025
Referencia:	Revista Brasileira de Ci~encia do Solo, v. 49, spe1, e0240133, 2025.
Descripción:	ABSTRACT: Phosphorus (P) is one of the most limiting elements for plant nutrition in tropical and subtropical soils due to its high binding energy on the surface of iron and aluminum oxides and hydroxides. Flooded rice cultivation occurs in lowlands, influencing redox reactions and P dynamics. This study aimed to evaluate the forms of phosphorus and their lability after soil reoxidation subsequent to a period of flooding for irrigated rice cultivation following four seasons of cultivation with soybean-ryegrass and corn-white clover succession in an Albaqualf (Planossolo) fertilized with triple superphosphate under no-tillage. The experiments were conducted in Albaqualf (Planossolo), in a 2 × 2 double factorial scheme, with factor 1 being P fertilization and factor 2 being flooding followed by drainage. Triple superphosphate was used as the P source. One of the experiments consisted of a soybean-ryegrass, and the other consisted of corn-white clover, cultivated for four years, with irrigated rice cultivated in the fifth year. Using TSP increased the soil P-labile fraction by 107 and 114 %, for soybean-ryegrass succession and cornwhite clover succession, respectively. After the end of the flooding period and post-soil drainage, a reduction of 17 and 13 % was observed in the P-labile and P-moderately labile fractions, in soybean-ryegrass, respectively. And the same fractions in the cornwhite clover succession decreased 12 and 5 %, respectively. Using P fertilizer increases the fractions of P-labile, P-moderately labile, and P-less labile in the soil. Soil drainage after rice cultivation reduces the fractions of labile and moderately labile phosphorus in the soil, regardless of the crop succession used.
Thesagro:	Arroz Plantio Direto Rotação de Cultura Fixação de Fósforo
NAL Thesaurus:	Rice No-tillage Crop rotation
Palabras clave:	Labile phosphorus
DOI:	10.36783/18069657rbcs20240133
Tipo de Material:	Artigo de periódico
Acceso:	openAccess
Aparece en las colecciones:	Artigo em periódico indexado (CPACT)