To study the effect of repeated machinery traffic on soil physical properties. The aim was to evaluate the impacts of multiple passes of a self-propelled sprayer on a Ferralsol. A trial was performed on a clayey-textured humic Ferralsol under conventional tillage. Sprayer traffic was applied in a strip-plot with four treatments: no traffic (T0), one pass (T1), three passes (T3), and seven passes (T7) of the self-propelled sprayer. Physical properties such as total porosity (TP), macroporosity (Mac), microporosity (Mic), soil bulk density (ρ_b), soil resistance to penetration (PR), and aggregate stability (ASI) were determined down to 0.40 m of depth, under the track wheels. Traffic-induced changes in soil physical properties were observed to 0.20 m depth, but the main impacts occurred at 0.10 m and comprised increased ρ_b and PR, and decreased Mac and ASI. Even though Mac reduction reached critical values (Mac < 0.10 m³m⁻³) under the wheel tracks after seven passes, PR was below 2.0 MPa at all depths. Despite affecting soil physical properties, self-propelled sprayer traffic did not cause severe physical degradation of the Ferralsol or changes in the soil structure to an extent that would severely limit root growth.

研究重复机械交通对土壤物理性质的影响。目的是评估自走式喷雾器多次通过 Ferralsol 的影响。在常规耕作下对粘土质地的腐殖质 Ferralsol 进行了试验。喷雾器交通应用在带四种处理的带状小区中：自走式喷雾器的无交通 (T0)、一次通过 (T1)、三次通过 (T3) 和七次通过 (T7)。物理性质，例如总孔隙率 (TP)、大孔隙率 (Mac)、微孔隙率 (Mic)、土壤容重 ( ρ _b)、土壤抗渗透性 (PR) 和集料稳定性 (ASI) 均在履带轮下方 0.40 m 处进行测定。在 0.20 m 深度观察到交通引起的土壤物理特性变化，但主要影响发生在 0.10 m 处，包括增加的ρ _b和 PR，以及降低的 Mac 和 ASI。即使在七次通过后轮迹下Mac 减少量达到临界值 (Mac < 0.10 m ³ m ^-3 )，PR 在所有深度都低于 2.0 MPa。尽管影响了土壤物理特性，但自走式喷雾器的交通不会导致 Ferralsol 的严重物理降解或土壤结构的变化到严重限制根系生长的程度。