Fertilizantes organominerais à base de biossólidos: estratégia para o aumento da eficiência no uso de nutrientes em planossolos

Abstract

Sandy soils occur in all parts of the world. These soils, although low in productivity, are intended for agricultural production, even though the cation exchange capacity (CTC) is low with the availability of nutrients related almost exclusively to the presence of organic matter. This study aims to provide a scientific basis for the use in agriculture of organic waste from a sewage treatment plant, enriched with phosphorus and potassium as an organomineral fertilizer (FOM), identifying the best proportion of nutrients to be adopted for cultivation in organic systems. The sources to be used for the production of each FOM were characterized, as well as their formulations. Then, the dynamics of nutrient release was evaluated considering the particularities of these organic fertilizers, as well as the effect of using these proposed formulations of FOM on the loss of nutrients by leaching. Finally, an agronomic performance test was carried out on these FOMs formulations and the effect of their application on the dynamics of nutrients in the soil evaluated. Organomineral compound fertilizers using biosolids have the potential to be used as fertilizers. However, it is essential to know the behavior of organomineral fertilizers by evaluating their use over time and under conditions of accumulation of organic matter. These fertilizer sources have the productive potential for alternative planting systems and serve as an incentive to discuss the permission to use this biosolid in agriculture, which is the stabilized sludge compound.