somewhat effective and particles smaller than 60 mesh are 100 percent effective. By combining the chemistry of a particular product (CCE) and its particle size the Effective Calcium Carbonate Equivalent (ECCE) is determined. The ECCE is percentage comparison of a particular agricultural limestone with pure calcium carbonate with all particles smaller than 60 mesh. Typically the aglime materials in commercial use will have ECCE ranging from 45 percent to 110 percent. Brazil's case Brazil's vast inland cerrado region was regarded as unfit for farming before the 1960s because the soil was too acidic and poor in nutrients, according to Nobel Peace Prize winner Norman Borlaug, an American plant scientist referred to as the father of the Green Revolution. However, from the 1960s, vast quantities of lime (pulverised chalk or limestone) were poured into the soil to reduce acidity. The effort continued, and in the late 1990s, between 14 million and 16 million tonnes of lime were spread on Brazilian fields each year. The quantity rose to 25 million tonnes in 2003 and 2004, equalling around five tonnes of lime per hectare. As a result, Brazil has become the world's second biggest soybean exporter, and thanks to the boom in animal feed production, Brazil is now the biggest exporter of beef and poultry in the world. Effect on prehistoric mobility studies A 2019 study demonstrated that agricultural lime affects strontium-based mobility studies, which attempt to identify where individual prehistoric people lived. Agricultural lime has a significant effect in areas with calcium-poor soils. In a systematic study of a river system in Denmark, the Karup River, more than half of the strontium in the river's catchment area was found to come from runoff of agricultural lime, and not from the surrounding natural environment. Such introduction of agricultural lime has resulted in researchers wrongly concluding that certain prehistoric individuals originated far abroad from their burial sites, because strontium isotopic results measured in their remains and personal effects were compared to burial sites contaminated by agricultural lime. See also Marl Liming (soil) Soil pH References Further reading Transcription of 1919 text by Alva Agee. "A Study of the Lime Potential, R.C. Turner, Research Branch, Canadian Department of Agriculture, 1965 Materials Soil improvers Limestone industry