Dataset of infiltration dynamics of an agricultural Vertisol amended with corn-cob biochar in Michoacán, Mexico

This dataset contains laboratory infiltration measurements obtained from an agricultural Vertisol collected in the Morelia–Queréndaro Valley, Michoacán, Mexico. Soil samples were collected at 0–30 cm depth, integrated into a composite sample, air-dried, homogenized, and sieved to 2 mm. Two treatments were evaluated under controlled laboratory conditions with 10 independent experimental units per treatment: soil without biochar (control) and soil amended with corn-cob biochar at a 1:3 biochar:soil volumetric ratio (v/v). The biochar was produced by pyrolysis at 450–600 °C under limited oxygen conditions.Infiltration was measured using a Mini Disk Infiltrometer at a pressure head of −5 cm. The dataset includes time, reservoir water volume, cumulative infiltration, fitted C1 and C2 coefficients for the common 0–320 s interval, goodness of fit (R²), total time required to infiltrate an equivalent water volume, and summary statistics used to construct the infiltration curve presented at the 50th Mexican Congress of Soil Science (50CMCS), BUAP, 2026.The 1:3 (v/v) biochar:soil ratio was deliberately selected as an exploratory contrast condition to evaluate potential changes in soil hydraulic behavior and should not be interpreted as an agronomic application recommendation. Experimental replicates represent independent laboratory units and not spatial field replicates.