Antinuclear

A University of Melbourne survey of hundreds of Australian studies going back three decades found that using the country’s soils to offset a significant proportion of national greenhouse gases “is technically limited and economically unviable at the present time”. Published in the journal Nature Scientific Reports, it suggests farmers would lose out through soil-carbon projects at carbon prices backed by both the government and the opposition.

Report co-author Rick Roush, the Dean of the Melbourne School of Land and Environment, said most active soil scientists thought it would be “a stretch” for farmers to use the Carbon Farming Initiative – a policy that encourages soil-carbon projects and is backed by both major parties……

Sequestering carbon would likely be restricted to the top 10 centimetres of soil, and be limited by low-nutrient levels and water scarcity. Application of fertiliser would boost the sink capacity of soils but at a rising cost to farmers, Professor Roush said.

Better investment Carbon is slow to accumulate in the soil, and the agricultural methods mostly likely to encourage it, such as no-till farming, are already widely used, he said.

While the survey focused on Australian studies, Professor Roush said carbon bio-sequestration may not have much greater promise overseas. “Our gut suspicion is that it will also be disappointing even in areas that have better rainfall and better soil fertility to start with, for the same reasons,’’ he said. ‘‘It’s difficult to keep soil carbons accumulating when you continue to plough and cultivate annual crops.”http://www.smh.com.au/environment/climate-change/coalitions-soil-carbon-plan-unviable-study-finds-20130717-2q3e3.html#ixzz2ZQw8eNMA