Archive for the ‘biochar analysis’ Category

Quantifying biochar impact on soil

December 3, 2010

Discussions with IRRI gave some simple assumptions which can be used when assessing the impact of biochar addition on the soil.

If biochar analysis is available, then the impact of a known volume of biochar to soil can be calculated. For example, if one square metre of soil is amended with 4 kg of biochar (this is a 40 t/ha application rate), then we can assume that this represents 4% of the soil weight. This is because in 1 m at a 10 cm depth there is 100 litres of soil with an approximate bulk density of 1, which is 100 kg of soil. The properties of the biochar can then be assumed to be diluted in the soil at a 4% rate.

This assumption was then applied to the CEC (Cation Exchange Capacity) where rice husk biochar is added to the research farm soil in Siem Reap, Cambodia.
The soil has a CEC of 18.44 cmol+/kg
Biochar has a CEC of 44.5 cmol+/kg.

Therefore the CEC of the soil can be assumed to be raised to (18.44*0.96)+(44.51*0.04) = 19.48

This is a rough assumption, and should not substitute using actual data, and it assumes that there are no interactions between the soil and the biochar which could influence the CEC of the soil.

POM deployment in biochar and waste water of gasifier

June 2, 2010

POM was deployed in two areas where waste water from the gasifier ends up.

The gasification unit is EAP SOPHAT ice factory in Kralanh town, Siem Reap Province, which is the source of biochar from the plot and pot trials in Cambodia.

POM deployment 02.06.10 EAP SOPHAT gasification unit biochar and waste water