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DIVISION S-6—SOIL & WATER MANAGEMENT & CONSERVATION

Factors Contributing to the Tensile Strength and Friability of Oxisols

^a FCA, Universidad Nacional del Litoral, Av. P. Kreder 2805, CP:3080-Esperanza(SF), Argentina
^b ESALQ, Universidade de Sao Paulo, Av. Padua Dias 11, CEP:13418-900, Piracicaba(SP), Brazil, Bolsista CNPq
^c Institute of Soil Science and Plant Cultiviation, 24-100 Pulawy, Poland

* Corresponding author (apisilva{at}esalq.usp.br)

Tensile strength (TS) and friability (F) are considered useful indicators of soil structural quality. This study hypothesized that TS and F are strongly influenced by soil intrinsic properties in some Oxisols. This research was conducted on soil samples collected from a sugarcane (Saccharum officinarum L.) farm and sampling sites (n = 25) were located along an Oxisols catena. The transect crossed three soil types: clayey Rhodic Hapludox; loamy Typic Hapludox, and sandy Typic Hapludox. Each sample comprised of 35 aggregates collected from the top layer. Tensile strength, F, particle-size distribution, organic matter (OM), crystalline oxides, and poorly crystalline oxides were measured. Multiple regression analysis showed that TS was positively related (R² = 0.92) with clay + silt (CS) content and OM, and that poorly crystalline Fe oxides were the constituent of CS fractions that most contributed to TS. Results also indicated that the soils were highly friable, with the crystalline Fe forms being positively related with soil F.

Abbreviations: CS, clay + silt • F, friability • OM, organic matter • TS, tensile strength

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