Effect of organic and organomineral fertilization on the C and N contents of soil cultivated with sweet potatoes

Abstract

Organic and organomineral fertilization in agroecological systems is important to soil conservation
because it contributes to the increase of total C and N stocks in the soil. In this context,
the objective of this work was to evaluate the effect of organic and organomineral fertilizers on
the soil C and N contents. The experimental design was a randomized block design, with four
replications. The treatments consisted of five fertilizers (organic and organomineral) applied to
the soil in the implantation of the sweet potato crop and the control, where no fertilization was
done in the crop. Analyzes of total organic C and total N levels were performed. Fertilizers with
organomineral and organic fertilizers promoted increases of up to 51% in total soil organic C
contents up to 45 days after application. In general, bovine manure provided the highest levels
of organic C (2.17 dag kg-1) and total N (0.15 dag kg-1) of the soil for 135 days after application.