25Change in soil organic carbon stock for a project area for a reporting period

25  Change in soil organic carbon stock for a project area for a reporting period

 (1)  The View image in the official source for a project area for a reporting period, in tonnes of soil organic carbon, is worked out using the following equation:

| View image in the official source <br> | equation 6 |

View image in the official source is the number of CEAs in the project area.

View image in the official source is the change in soil organic carbon stocks with a specified probability of exceedance, in tonnes of soil organic carbon for the ith CEA in the project area for the reporting period, given by:

 (a) if, pursuant to section 15, Schedule 2 has been used for the CEA for the reporting period—the value of View image in the official source for the CEA for the reporting period worked out using equation 116;

 (b) if, pursuant to section 15, Schedule 1 has been used for the CEA for the reporting period—the value of View image in the official source for the CEA for the reporting period as worked out using equation 69.  

View image in the official source is the sum of the following:

 (a) if the carbon content of any biochar applied in CEAi in the project area in the relevant period defined in subsection (2) is known—the amount obtained by multiplying the carbon content of that biochar, expressed as a proportion, by the total quantity of that biochar, in tonnes, applied in the CEA in that period;

 (b) if the carbon content of any biochar applied in CEAi in the project area in the relevant period defined in subsection (2) is not known—the amount obtained by multiplying the default carbon content of biochar specified in the Supplement multiplied by the total quantity of that biochar, in tonnes, applied in the CEA in that period.

View image in the official source is the sum of the following:

 (a) if the carbon content of any non-synthetic fertiliser applied in CEAi in the project area in the relevant period defined in subsection (3) is known—the amount obtained by multiplying the carbon content of that non-synthetic fertiliser, expressed as a proportion, by the total quantity of that non-synthetic fertiliser, in tonnes, applied in the CEA in that period;

 (b) if the carbon content of any non-synthetic fertiliser applied in CEAi in the project area in the relevant period defined in subsection (3) is not known—the amount obtained by multiplying the default carbon content of non-synthetic fertiliser specified in the Supplement by the total quantity of that non-synthetic fertiliser, in tonnes, applied in the CEA in that period.

(2)  For the purposes of the definition of View image in the official source in subsection (1), the relevant period means the period:

 (a) commencing from the start of the collection of samples for the baseline sampling round or, as applicable pursuant to section 15, the first estimation event; and

 (b) ending on:

 (i) the last day on which any samples are collected for the subsequent sampling round for the CEA for the reporting period; or

 (B) the last sample collected for that event.

 (3) For the purposes of the definition of View image in the official source in subsection (1), the relevant period means:

 (a) if the relevant interval defined in subsection (4) is greater than two years—the period of two years before:

 (i) the last day on which any samples are collected for the subsequent sampling round for the CEA for the reporting period; or

 (B) the last sample collected for that event;

 (b) if the relevant interval defined in subsection (4) is less than two years—the relevant interval.

(4)  For the purposes of subsection (3), the relevant interval means the interval between:

 (a) the start of the collection of samples for the baseline sampling round or, as applicable pursuant to section 15, the first estimation event; and

 (b) either:

 (i) the last day on which any samples are collected for the subsequent sampling round for the CEA for the reporting period; or

 (B) the last sample collected for that event.