Aggregate stability and penetration resistance after mobilization of a dystrocohesive Ultisol

Abstract

Evaluation of mobilized soil profiles can provide important information on soil compaction reduction processes. In this context, the objective of this study was to evaluate alterations in soil penetration resistance and the impact on the aggregate stability of a cohesive Ultisol cultivated with sugarcane. The experiment was carried out at the Carpina Sugarcane Experimental Station (EECAC/UFRPE), located in the city of Carpina, PE. Penetration resistance, mobilized area and depth, and percentage of soil aggregates were evaluated before and after soil tillage. Soil mobilization improved soil aggregate uniformity and decreased penetration resistance in the 0-0.20 m layer. Coarse soil fraction, moisture and organic carbon positively contributed to the increase in soil mobilization.

Multifractal analysis of soil penetration resistance under sugarcane cultivation

“…The mean and standard deviation of PR in the vertical profiles of the 0-0.60 m layer are shown in Figure 2E. The increase in standard deviation with depth is because soil management under sugarcane cultivation typically results in homogenization of the surface layer, as reported by Tavares et al (2017). The plot shows that the lowest PR…”

“…The vertical PR profiles of different relief units are shown in Figure 2 Tavares et al (2017) suggested that PR is influenced by soil clay content and bulk density, which is associated with the volumetric content of water. Therefore, the greater PR homogeneity over depth in the type D relief unit is likely associated with the dynamics of water in soil since this relief unit had the lowest elevation (between 65 and 68 m).…”

“…Skewness, kurtosis and maximum deviation indicated normal frequency distributions in eight profiles (profiles 2, 7, 10, 13, 16, 22, 25 and 27) and log-normal frequency distributions in eight profiles (profiles 21, 11, 26, 18, 28, 41, 47, and 60). Siqueira et al (2013) and Tavares et al (2017) suggested that a high variation in PR data is due to the high variability of PR values throughout the landscape.…”

“…In this sense, research on soil compaction should consider mathematical models that take soil heterogeneity into account, even at small scales. The degree of compaction of soil can be characterized by measuring its resistance to penetration based on its dynamic nature and its interaction with other factors such as soil composition, structure, bulk density, porosity and water content (Lipiec & Hatano, 2003;Siqueira et al, 2015;Lima et al, 2017;Tavares et al, 2017). Folorunso et al (1994) examined the soil penetration resistance (PR) in parallel transects and found that fractal analysis allowed a qualitative discrimination of soils, despite small variations across scales.…”

Mejoramiento de las propiedades físicas y químicas de los suelos ácidos con la aplicación de vinaza

“…Estos resultados corroboran parcialmente la segunda hipótesis planteada, debido a que la vinaza es una alternativa amigable y eficiente para disminuir la fertilización mineral y la contaminación ambiental, y son consistentes con los hallazgos de estudios experimentales previos respecto de que la aplicación de vinaza aumenta los niveles de Ca 2+ y Mg 2+ , así como de otros nutrientes como N, P y K + (Paulino et al 2011, Jiang et al 2012, Prado et al 2013, Andreotti et al 2015, Tavares et al 2017. Estos hallazgos indican que la adición de vinaza tiende a aumentar el contenido de cationes bases en suelos ácidos, lo que conduce a una mayor liberación de nutrientes para las plantas cultivadas en estas condiciones.…”