Spatial distribution of phosphorus in an Oxisol amended with sewage sludge and mineral fertilization/Distribuicao espacial de fosforo em Latossolo tratado com lodo de esgoto e adubacao mineral

• Published in: Revista brasileira de engenharia agrícola e ambiental Vol. 18; no. 3; p. 287
• Main Authors: Costa, Vanessa L, de Maria, Isabella C, Camargo, Otavio A, Grego, Celia R, Melo, Leonidas C.A
• Format: Journal Article
• Language: Spanish
• Published: ATECEL--Associacao Tecnico Cientifica Ernesto Luiz de Oliveira Junior 01.03.2014
• Subjects: Sludge
• ISSN: 1415-4366

In agricultural soils receiving sewage sludge and subjected to water erosion, may occur intense transport of phosphorus (P) to the lower parts of the landscape and eventually to water bodies. The objective of this study was to evaluate the spatial distribution of P in an Oxisol cultivated with maize. The treatments were evaluated with application of mineral fertilization (MF) and sewage sludge (SS). Soil samples were collected following a sampling grid of 69 points in each treatment at the beginning and at the end of the crop cycle, in an experimental area with 10% slope. There was a moderate spatial dependence of P in the soil in the treatment of MF, resulting in higher concentrations of P in the deeper layers of the soil caused by erosion. The same standard was observed for the soil attributes sum of bases, cation exchange capacity and soil organic matter. Conversely, when SS was applied there was a randomized distribution of P in the plots because of the non-uniform manner of its application. Such random distribution of P showed correlation with soil organic matter. Key words: organic residue soil erosion fertilization Em solos agricolas que recebem aplicacao de lodo de esgoto pode ocorrer, quando sujeitos a erosao hidrica, intenso transporte de fosforo (P) para trechos inferiores da paisagem e, eventualmente, para os corpos de agua. O objetivo com este trabalho foi avaliar a distribuicao espacial de P em um Latossolo Vermelho eutroferrico, cultivado com milho. Os tratamentos foram avaliados com aplicacao de adubo mineral (AM) e de lodo de esgoto (LE). Amostras de solo foram coletadas seguindo uma grade amostral de 69 pontos em cada tratamento, em duas epocas, no inicio e no final do ciclo da cultura, em uma area experimental com 10% de declividade. No tratamento AM houve dependencia espacial moderada de P no solo ocorrendo maiores concentracoes de P na parte inferior do talhao, causada pela erosao do solo. O mesmo padrao foi observado para soma de bases, capacidade de troca cationica e materia organica do solo. Por outro lado, a aplicacao de LE, feita de maneira nao uniforme, resulta em sitios com maiores teores de fosforo aleatoriamente distribuidos e correlacionados com a materia organica do solo. Palavras-chave: residuo organico erosao de solo fertilizacao