Low-carbon agriculture, a program introduced by the Ministry of Agriculture, Livestock and Food Supply in mid-2010, aims to combine the sustainable production of food, fibers and energy with the reduction of greenhouse gas emissions and the conservation of natural resources. To this end, the Brazilian government encourages the use of the following techniques: no-till farming, biological nitrogen fixation, integrated crop-livestock-forest systems, planting of commercial forests, recovery of degraded pastures, and treatment of animal waste. The government aims to reduce emissions by more than 150 million tons of CO2 with these techniques by sequestering carbon in plants and soils. Although these techniques have proved to be effective in reducing greenhouse gas emissions, there are no methods or equipment available for the large-scale assessment of the quality and stability of the carbon captured in the soil. This project proposes to improve and transfer technologies based on photonic techniques for fast assessment of soil carbon quantity and stability. The final objective of the project is to transfer to the productive sector at least one technology based on photonic techniques to quantify carbon and/or assess its stability in the soil.