Leaching of phosphorus in relation to diffusion time in columns with aggregates of a Rodhic Haplustox

Revista Brasileira de Engenharia Agrícola e Ambiental

Alvarez V., Víctor H.²  Ruiz, Hugo A.²  Silva, Davi J.¹  Bahia Filho, Antonio F. de C.⁵  Ferreira, Paulo A.⁴  Araújo, Cícero A. de S.³ 

[1] Embrapa Semi-Árido, Petrolina;Universidade Federal de Viçosa, Viçosa;Centro Federal de Educação Tecnológica de Petrolina, Petrolina;Universidade Federal de Viçosa;Embrapa Milho e Sorgo, Sete Lagoas

关键词: solute transport;    leachate;    Latosol    INTRODUÇÃOOs Latossolos desenvolvidos nas áreas sob vegetação de cerrado apresentam;    geralmente;    estrutura formada de grânulos muito pequenos e;    também;    apreciáveis problemas de fertilidade;   

DOI  :  10.1590/S1415-43662003000100005

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

This study quantified phosphorus in effluents of a Brazilian Rodhic Haplustox (Red Latosol) aggregates, in relation to diffusion time, using distilled water, Mehlich-1 extractor (HCl 0.05 mol L-1 + H2SO4 0.0125 mol L-1), and ammonium acetate 0.1 mol L-1 solution at pH 7 as eluates. Treatments corresponded to a 4 x 5 factorial scheme: four aggregate classes (2.0-1.0, 1.0-0.5, 0.5-0.25, and 0.25-0.105 mm) and five diffusion times (0, 1, 2, 4, and 6 days). The columns which corresponded to zero diffusion time received an eluate volume equal to ten times the pore volume, collected in five effluent fractions, each one with two pore-volumes. In the remaining experimental units, the elutions were accomplished with two pore-volumes at intervals indicated for each diffusion time. The distilled water leached greater amount of phosphorus from the smallest aggregates which increased with the increasing diffusion time. The Mehlich-1 extractor leached three to sixty times more phosphorus than the distilled water, showing a reverse behavior in relation to aggregate class and contact time. Phosphorus quantities leached with the ammonium acetate solution did not reach the minimum concentration required for detection.

【 授权许可】

CC BY-NC