02496naa a2200241 a 450000100080000000500110000800800410001902200140006010000160007424501860009026000090027630000230028552017440030865000120205265000270206465000100209165000210210165000110212270000170213370000150215070000160216577300730218110327982019-10-11       2005    bl uuuu     u00u1 u    #d  a0022-45611 aTERRA, J.A.  aImpacts of landscape attributes on carbon sequestration during the transition from conventional to conservation management practices on a coastal plain field.h[electronic resource]  c2005  c2-s2.0-33845349561  aABSTRACT: Field-scale experiments on degraded soils comparing management systems would facilitate a better understanding of the soil organic carbon (C) landscape dynamics associated with transition to conservation systems. We assessed the effects of soil management practices and terrain attributes on soil organic C in a 9 ha (22.2 ac) Alabama field (Typic and Aquic Paleudults). Treatments were established in strips across the landscape in a corn (Zea mays L.)-cotton (Gossypium hirsutum L.) rotation. Treatments included a conventional system (chisel plowing/disking without cover crops) with or without dairy manure, and a conservation system (no-till and cover crops) with and without manure. A soil survey, topography, soil electrical conductivity, initial soil organic C and soil texture were used to delineate management zones or clusters. After one rotation cycle (30 months), averaged across 240 positions distributed over the entire field, no-till or conventional tillage + manure increased soil organic C (0 to 5 cm; 0 to 2 in depth) by ~50 percent compared to conventional tillage (7.34 and 7.62 vs. 5.02 Mg ha-1; 3.28 and 3.40 vs. 2.24 t ac-1, respectively); but no-till+manure increased soil organic C by 157 percent. Initial soil organic C content was the most common correlated variable with soil organic C changes (?SOC) across the landscape for all treatments and conservation systems had greater soil organic C increases relative to conventional systems at low soil quality landscape positions. Our results show the potential to sequester C using high-residue producing conservation systems and manure is scale dependent, and may be higher than previously expected for degraded soils in the southeastern United States.  aALGODON  aCONSERVACION DE SUELOS  aMAÍZ  aMANEJO DE SUELOS  aSUELOS1 aREEVES, D.W.1 aSHAW, J.N.1 aRAPER, R.L.  tJournal of Soils and Water Conservation, 2005gv.60 (6), p. 438-445.