Platy structure development under no-tillage in the northern humid Pampas of Argentina and its impact on runoff

摘要: Abstract The no-tillage system (NT) is widespread in the silty soils of Argentine Humid Pampas. aims this study were i) to characterize evolution structure A horizon northern Pampas due conversion NT, particularly presence platy and its development through time, by taking advantage a chronosequence since NT; ii) evaluate how extension relates characteristics crop sequences runoff long-term experiment. Thus, 25 Argiudolls with different NT history was analyzed using visual evaluation (VSE) method (“le profil cultural”). Fourteen natural-rainfall erosion plots 3.5% slope used analyze relationship between soil structural state, sequence runoff. VSE allowed us understand type organization under highlight regional extent near surface, impact on All sites exhibited horizontal (2–10 cm thick), mainly developing surface or right granular surface. Under structure, cΦ observed all (30–75% horizon). found number consecutive years proportion structure. This may result from combination an initial late cГ results obtained during five-year period prove that alters drainage pattern, restricts water entry into favors according profile horizon.