Tillage Intensity Effects on Soil Structure Indicators—A US Meta-Analysis

Márcio R. Nunes, Douglas L. Karlen and Thomas B. Moorman
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Márcio R. Nunes: USDA-Agricultural Research Service, National Laboratory for Agriculture and the Environment, 1015 N. University Boulevard., Ames, IA 50011-3611, USA
Douglas L. Karlen: USDA-Agricultural Research Service, National Laboratory for Agriculture and the Environment, 1015 N. University Boulevard., Ames, IA 50011-3611, USA
Thomas B. Moorman: USDA-Agricultural Research Service, National Laboratory for Agriculture and the Environment, 1015 N. University Boulevard., Ames, IA 50011-3611, USA

Sustainability, 2020, vol. 12, issue 5, 1-17

Abstract: Tillage intensity affects soil structure in many ways but the magnitude and type (+/−) of change depends on site-specific (e.g., soil type) and experimental details (crop rotation, study length, sampling depth, etc.). This meta-analysis examines published effects of chisel plowing (CP), no-tillage (NT) and perennial cropping systems (PER) relative to moldboard plowing (MP) on three soil structure indicators: wet aggregate stability (AS), bulk density (BD) and soil penetration resistance (PR). The data represents four depth increments (from 0 to >40-cm) in 295 studies from throughout the continental U.S. Overall, converting from MP to CP did not affect those soil structure indicators but reducing tillage intensity from MP to NT increased AS in the surface (<15-cm) and slightly decreased BD and PR below 25-cm. The largest positive effect of NT on AS was observed within Inceptisols and Entisols after a minimum of three years. Compared to MP, NT had a minimal effect on soil compaction indicators (BD and PR) but as expected, converting from MP to PER systems improved soil structure at all soil depths (0 to >40-cm). Among those three soil structure indicators, AS was the most sensitive to management practices; thus, it should be used as a physical indicator for overall soil health assessment. In addition, based on this national meta-analysis, we conclude that reducing tillage intensity improves soil structure, thus offering producers assurance those practices are feasible for crop production and that they will also help sustain soil resources.

Keywords: Soil health; no-tillage; perennial systems; aggregate stability; cropping system (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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