Soil aggregation and soil organic carbon stabilization: Effects of management in semiarid Mediterranean agro-ecosystems

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Soil Science Society of America

This study compared the combined and individual effects of three tillage systems and two cropping systems in a semiarid Mediterranean agroecosystem. The tillage systems were no-till (NT), reduced tillage (RT), and conventional tillage (CT); sites were cropped with either continuous barley or a barley-fallow system. Under both cropping systems, NT treatments had over 30% greater soil organic carbon (SOC) storage in the surface five cm of soil. The continuous barley treatment had greater SOC stabilization than the barley-fallow treatment only under no-till management. NT soils also showed a greater proportion of water stable macroaggregates. The authors conclude that the combined systems of no-till and fallow-suppression have the potential to increase stable SOC in the soil surface as well as improve overall soil structure and aggregation in the semiarid Mediterranean.

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Conservation agriculture, Semiarid zones, Soil management, Soil, Conservation tillage, Soil organic matter, Agricultural ecosystems, Soil organic carbon (soc), No-till, Soil aggregation, Field Scale
Soil Science Society of America Journal 73(5): 1519-1529