Influência do volume da amostra para determinação de propriedades físicas do solo

Abstract

Soil quality is one of the main factors for plant development, however, it is essential to have good physical characteristics of the soil so as not to limit root growth. The objective of this work was to compare the influence of different sizes of volumetric cylinders on the physical properties of the soil. Four sample volumes 85 cm³ (A), 100 cm³ (B), 141 cm³ (C) and 221 cm³ (D) were tested, which were embedded in the soil with the aid of a sampler. Sampling was carried out at a depth of 2–7 cm, with 18 repetitions. Density was evaluated; total porosity; macroporosity; microporosity; and penetration resistance in a Dystroferric RED LATOSOL. A descriptive analysis of the data was carried out, and the normality of the data was verified with the Shapiro-Wilk test, at a 5% probability level, and outliers were detected and removed. The volume of the cylinders was compared using the confidence interval, observing the relationship between the variables (determination coefficient). The 221 cm³ cylinder can be considered the volume that best represents the soil structure for collecting undisturbed samples.