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The size of aggregates and the aggregation state can modify the soil structure, especially when there is the intensive management of that with the sugarcane cultivation. The objective was to evaluate the influence cultivation cycles of sugarcane in the aggregation in the different layers of a typical Oxisol, located in Bebedouro, Sao Paulo State, Brazil. Three plots have been selected on March 2012 with sugarcane cycles harvested mechanically without previous sugarcane burning: sugarcane ratoon of one cycle (C1), sugarcane ratoon of seven cycles (C7) and sugarcane ratoon of eight cycles (C8), and an adjacent area of native forest (NF). The experimental design was a randomized block with split plot with four replications. Areas consisted of plots and subplots being formed by the depths 0-0.10, 0.10-0.20 and 0.20-0.30 m. The evaluated variables: mean geometric diameter (MGD), mean weight diameter (MWD), sensitivity index of the aggregates (IS) and organic matter content of soil (OM). The C8 cycle showed the highest MWD and MGD, similar levels of OM compared to the sugarcane ratoon cycles, it indicates that this treatment was not result in adverse effect to the soil structure even that has longer sugarcane ratoon cycles. The mean geometric diameter had a worse correlation with soil organic matter in the 0.10-0.20 m layer.

Agregação de um Latossolo em função de diferentes ciclos de cultivo de cana-de-açúcar sob colheita mecanizada