Dynamics of chemical attributes of soil in different land use systems in the municipality of Santa Barbara do Para, Brazil

Concern about the quality of the soil and quantification of changes in its attributes is of great importance for the monitoring of soil productivity in order to improve the management of the sustainability of agricultural systems. Soil quality is the capacity in this act positively in the regulation of energy flow in a particular ecosystem, whether natural or agricultural. Thus, the study aimed to assess the dynamics of soil chemical properties in four different land use systems in two sampling periods, dry and rainy in the municipality of Santa Bárbara do Pará, Brazil. The study was conducted in the municipality of Santa Barbara-PA in four land use systems: agroforestry system (SAF), cassava crop cultivation (Manihot esculenta Crantz) and witness the natural forest vegetation in a completely randomized design in a factorial 4 x 2 (four systems and two periods collect). The soil quality was obtained by determining soil chemical properties. The use of SAF system showed higher Ca, Mg, P, and the lower acidity of the soil, while the forest showed higher levels of K, Al and increased soil acidity. The dry period showed higher exchangeable Al and P values compared to the rainy season. But the K showed higher levels in the rainy season compared to the dry. The highest Ca values, Mg, P and lower acidity in the SAF, compared to other systems use this system gives better sustainability.