Thus, SOM can be affected by the plant species present in a crop
rotation and it depends on the input of dry matter and N. In the
absence of mineral nitrogen fertilization, SOM may be increased
with the use of species that accumulate more N, and this increase
may be observed in more and less labile fractions. Thus, the
objective of this study was to evaluate the concentration and
quality of SOM as a result of crop rotation under NT, with no added
mineral nitrogen, in two different soil types (Rhodic Hapludox and
Typic Rhodudalf) over an experimental period of 10 years.