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Conservation agriculture, aggregate stability and the organic carbon distribution in soil aggregates

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Presentation at WCCA5 2011 by Mariela Fuentes, Luc Dendooven, Fernando De León, Jorge Etchevers, Claudia Hidalgo, Bram Govaerts

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Conservation agriculture, aggregate stability and the organic carbon distribution in soil aggregates

  1. 1. CONSERVATION AGRICULTURE, <br />AGGREGATE STABILITY AND THE <br />ORGANIC CARBON DISTRIBUTION IN <br />SOIL AGGREGATES<br />Mariela Fuentes, Luc Dendooven, Fernando De León, <br />Jorge Etchevers, Claudia Hidalgo, Bram Govaerts<br />
  2. 2. Carbon dynamics <br />*Soil quality<br />*Mitigation of climate change<br />Conservation agriculture vs conventional <br />
  3. 3. Aggregates <br />
  4. 4. Evaluated aggregate size distribution, and carbon distribution in three aggregate fractions during a cropping cycle of a soil cropped with maize and wheat in Central Mexico.<br />
  5. 5. EXPERIMENTAL STATION OF “EL BATÁN” <br />CIMMYT<br />Conventional tillage Zero tillage<br />with without with without<br />residues residues residues residues <br />rotation maize-wheat,wheat-maize<br /> monoculture (maize and wheat)<br />ZTM+r / -r<br />ZTR+r / -r<br />CTM+r / -r<br />CTR+r /-r<br />*The experiment was set up in 1991<br />*Subtropical highlands of central Mexico<br />*Haplic Phaeozem<br /> 25% sand 37% silt and 38% clay<br />
  6. 6. Samples undisturbed<br />0-5 and 5-10 cm soil layers <br />micro-aggregates (< 0.25 mm)<br />small macro-aggregates (0.25 to 1 mm)<br />large macro-aggregates (1 to 8 mm) <br />C autoanalyzer (TOC-5050A <br />Total Organic Carbon, Shimadzu©) <br />
  7. 7. MAIZE<br />0 to 5 cm<br />5 to 10 cm<br />MWD 0.29<br />WHEAT<br />MWD 0.57<br />MWD 0.7<br />
  8. 8. MAIZE<br />WHEAT<br />0 to 5 cm<br />5 to 10 cm<br />
  9. 9. WHEAT<br />MAIZE<br />0 to 5 cm layer<br />5 to 10 cm layer<br />
  10. 10. Large macro-aggregates small macro-aggregates microaggregates<br />Aggregates size distribution and their SOC contribution<br />CONSERVATION AGRICULTURE<br />CONVENTIONAL AGRICULTURE<br />0 to 5 cm layer<br />Total SOC= 22 g kg-1 <br />5 to 10 cm layer<br />Total SOC= 15 g kg-1 <br />0 to 5 cm layer<br />Total SOC= 13 g kg-1<br />0 to 5 cm layer<br />Total SOC= 13 g kg-1<br />
  11. 11. CONCLUSION <br />*The most attractive system to maximize C retention was<br /> zero tillage with residue (rotation or monoculture) <br />*The retention of C depends mainly the small and <br /> large macro-aggregates <br />
  12. 12. We know more about the movement of the celestial bodies than about the soil underfoot <br />Da vinci<br />Thank you very much<br />

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