Rice Field Soils Organic Matter Characterization Using Fluorescence Excitation/Emission Matrix Technique

摘要

Agricultural soil have the potential to make a significant contribution towards reducing net emission of greenhouse gases (CO-2, CH-4 and N-2O) to the atmosphere through increased carbon (C) sequestration in soil organic matter (SOM). Increasing SOM has the added benefit of improving soil quality and thereby enhancing the long-term sustainability of agriculture. In Brazil, from the 47 Mha used for the agriculture activities, in the year of 2005, 25 Mha will be under low tillage management. It should be noted that in addition to minimizing soil disturbance, reduced tillage practices also involve increased plant residue retention and cycling. This is the main factor to rebuilding soil organic carbon (SOC) levels. Rio Grande do Sul, the southest State of Brazil, is one of the main producers of irrigated rice in the country.