Characterization by fluorescence of Oxisol organic matter under sugarcane bagasse ash application

摘要

Sugarcane bagasse ash from sugar and ethanol industry contain organic matter and plant nutrients that can play an important role in agricultural production and the maintenance of soil fertility. The present study has aimed to evaluate the total soil carbon content and the humification degree of SOM by laser-induced fluorescence, following sugarcane bagasse ash application. The highest rate (80 Mg ha~(-1) dry bases) of sugarcane bagasse ash application to the soil caused an increase in the total soil carbon of around 1% for all Oxisoils. The humification degree of of the SOM decrease with decreasing of soil clay content. However, the humification degree increase with increasing of rate of sugarcane bagasse ash. Sugarcane bagasse ash application to the soil accelerate SOM mineralization and caused decrease of more humified SOM resulting in high levels of labile carbon and low humification degree, a phenomenon known as "priming effect.