Notes

Slide Show

Outline

1
2
3	Semi-Arid West Africa
4
5
6
7
8	Loss of Organic Carbon
9	OBJECTIVES To compare three methods of soil carbon determination To evaluate Loss on Ignition (LOI) method as possible method to measure soil organic carbon To explore ways to increase LOI calibration in West Africa soils
10	Current Limitations of Soil C Estimation Methods Limited practicality Limited accuracy Dynamic of carbon in the soil is still inadequately understood
11	MATERIALS and METHODS 27 soils from Mali From different regions and agricultural systems Clay content ranging from 3 to 60%.
12	Soil Locations, Cropping System and Clay Content
13	Soil Locations, Cropping System and Clay Content
14	MATERIALS and METHODS The compared methods for soil C measurement Walkley & Black method (dichromate oxidation) Combustion at high temperature (CO2 measured) Loss on ignition(LOI): destruction of the soil at high temperature
15	Materials and Methods Initial 105 120 105 120 Ending 350 600 600 350
16	RESULTS
17	Methods Comparison
18	Relationship between Clay and Carbon Content
19	Relationship between Clay and Carbon Content
20	Relationship between Combustion and Carbon Content by LOI
21	Relationship between Combustion and LOI:105^o-350^o
22	Relationship between Combustion and Carbon Content by LOI
23	Relationship between Combustion and Carbon Content by LOI
24	Relationship between Combustion and Carbon Content by LOI
25	CONCLUSIONS LOI (105-350^o) has a real advantage over Combustion and Walkley & Black methods Ease and technical simplicity when OM determination for a large number of soils is needed. Environmentally friendly.
26	END