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The objective of this work was to evaluate the changes in microbial biomass C, N and P due to the application of pig slurry under different soil tillage systems. The experiment was established in a clayey Oxisol, Eutrophic Red Latossol in Palotina, PR. Different quantities of pig slurry (0, 30, 60 and 120 m3 ha-1 year-1) were applied to the soil prior to the summer and winter crop season under conventional tillage (CT) and no tillage (NT), in three replicates. The area was cultivated with soybean (Glycine max L.) or maize (Zea mays L.) in the summer and wheat (Triticum sativum Lam.) or oat (Avena sativa L.) in the winter. The soil samples were collected in March and October of 1998 and 1999 at depths of 0-5, 5-10 and 10-20 cm. The soil tillage and pig slurry application influenced the microbial biomass C, N and P. The microbial biomass and the microbial activity presented high sensibility to detect changes in the soil due to tillage and the application of pig slurry. The soil microbial biomass and Cmic/Corg relation increased as the quantity of applied pig slurry increased. The metabolic quotient under CT increased with depth while under NT it decreased. The soil microbial biomass was enriched in N and P under NT and as the quantity of applied pig slurry increased. RESUMO Foram avaliadas, no presente trabalho, as alteraÃ§Ãµes na biomassa microbiana devido Ã  aplicaÃ§Ã£o de doses crescentes de dejetos lÃ­quidos de suÃ­nos (DLS) em diferentes sistemas de preparo de solo. O experimento foi conduzido em um Latossolo Vermelho eutrÃ³fico textura argilosa, em Palotina, PR; diferentes doses de dejetos lÃ­quidos de suÃ­nos (0, 30, 60 e 120 m3 ha-1 ano-1) foram aplicadas antes das estaÃ§Ãµes de verÃ£o e inverno em sistema de preparo do solo convencional (PC) e sistema de plantio direto (PD), em trÃªs repetiÃ§Ãµes. O experimento foi conduzido com a cultura de soja ou milho no verÃ£o e trigo ou aveia no inverno. As amostras de solo foram coletadas em marÃ§o e outubro de 1998 e 1999 nas profundidades de 0-5, 5-10 e 10-20 cm. O preparo do solo e as diferentes doses de DLS influenciaram o teor de C, N e P da biomassa microbiana. A biomassa microbiana e sua atividade apresentaram boa sensibilidade para detectar alteraÃ§Ãµes no solo, devido ao manejo. A biomassa microbiana e a relaÃ§Ã£o Cmic/Corg foram aumentadas com a aplicaÃ§Ã£o crescente de DLS. O quociente metabÃ³lico sob PC aumentou em profundidade ocorrendo o inverso sob PD. A biomassa microbiana foi enriquecida com N e P em virtude das doses crescentes de dejetos lÃ­quidos de suÃ­nos

Soil microbial biomass under different tillage and levels of applied pig slurry