Interação entre atributos físicos, químicos e mineralógicos e a capacidade máxima de adsorção de fósforo e chumbo de amostras do horizonte A e B de latossolos do estado do Paraná tratadas com calcário e fosfato

• Main Author: Vilar, Cesar Crispim
• Publication Date: 2010
• Format: Master thesis
• Language: por
• Source: Repositório Institucional da Universidade Estadual de Maringá (RI-UEM)
• dARK ID: ark:/35916/0013000002rcq
• Download full: http://repositorio.uem.br:8080/jspui/handle/1/1260
• topic: Latossolos; Adsorção de fósforo; Adsorção de chumbo; Função de pedotransferência (FPT); Calagem; Atributos físicos; Atributos químicos; Atributos mineralógicos; Fosfatagem; Paraná (Estado); Brasil.; Paraná (State); Brazil.; Ciências Agrárias; Agronomia

In regions with tropical and subtropical climates. Latosols are more common and are the most weathered soils. In these soils are used phosphate fertilizers in large quantities, since the phosphate has great interaction with these soils.With intense applications of such fertilizers, the soils can achieve their phosphorus maximum adsorption capacity (PMAC) and significantly alter its characteristics mainly the ability to retain other ions such as lead (PbMAC), affecting directly the environmental balance of the system. Soil samples were collected at 14 A and B horizons of Latosols on Paraná state, with the objectives of: (a) Find which attributes will correlate with the PMAC and PbMAC; b) Define if there is no difference, as the adsorption of phosphorus (P) and lead (Pb) in natural soil samples and treated with limestone and Pb treated with phosphate after liming the soils; and c) Find linear regression models to estimate PMAC and PbMAC. These samples were characterized in their physical, chemical and mineralogical attributes. The analyses were performed in the Laboratory of Chemical and Mineralogical Soil Analysis of the State University of Maringá. The PMAC correlated better with the mineralogical attributes such as aluminum concentration in the sulfuric, the dithionite-citrate-bicarbonate and the ammonium acid oxalate extractions and levels of gibbsite and goethite. The PbMAC presented greater correlation with the chemical attributes such as the c basic cations content and bases saturation. Treatment with limestone reduced the adsorption of P and increased the adsorption of Pb and treatment with phosphate increased the adsorption of Pb. The regression models that better adjusted both PMAC and PbMAC were estimated with all attributes. The results allowed to conclude that the practice of limning may be fundamental for the reduction the P adsorption and the formation of inner sphere surface complex seems to predominate on P adsorption and outer sphere surface complex on Pb adsorption.