The figures are based on inputs that produce carbon emissions in the growing and harvesting of sugar cane.
These included Diesel, Nitrogen, Phosphorous, Potassium and electricity usage. These emissions totalled 167.22 tons of carbon.
Through an avoided emission from the application of nitrogen; 50kgs of N less than the recommended rates gave me a credit of 98.17tons in CO2e.
The capture of carbon through plant stones (phytoliths) based on an average from our research across 15 varieties on my farm was 400kgs per hectare. This gave a further 74.304 tons reduction in CO2e .
So Carbon emitted was 167 tons and Carbon sequestered or avoided was 172tons, giving me a figure of -5 tons of carbon over the 100hectare farm.
Over the last 20 years I have been harvesting without burning the crop and this has allowed me to accumulate a lot of organic carbon on my property. Many of the fields have increased from less than 1% organic carbon to 5-6% organic carbon, so if we take a low to mid-range figure, I have been able to capture 20,000 tons + of carbon over that period, with all the associated benefits to soil health and reduction in chemical fertilizers.
This is not taking into account the milling process. With a co-generation plant, this figure is for every 1 ton of sugar produced we are negative 1028kgs of CO2.
I do many things on my farm that very few if any other farmers do, so these figure need to be tested on other properties, regions and countries before we make any broad claims.
In saying that, I have run the figures past some eminent scientists: no one at this stage has been able to find a problem with the figures.