The present study aimed to verify the floristic composition in two distinct areas: reforestation with Eucalyptus and degraded area subjected to fire. Plots of 0.5 m x 0.5 m were demarcated, distributed in transect in the two analyzed areas, were carried out. The analyzed aspects were the following: plant species variability, fresh mass, dry mass and litter. The results showed that the cultivation with eucalyptus was the one with the highest amount of plant species, reaching the number of 17 species, while in the degraded area 11 different species were found. In terms of fresh and dry mass, there was no observed difference between areas. In relation to litter, the cultivation with eucalyptus had the highest weight. It is concluded that the cultivation with eucalyptus showed the highest number of plant species and amount of litter; as for the fresh and dry mass, there were an equivalence in the results of the two areas.

Water stress is a limiting factors for soybean crop development, and it may increase due to subsurface soil acidity. The use of agricultural gypsum is a way to improve the soil chemical conditions at depth and mitigate the undesirable effects caused by water restriction during drought periods. This study aimed to evaluate whether gypsum application increases soybean yield in water restriction conditions. The experiment was implemented in 2018 in a Humic Cambisol, Southern Brazil. The treatments consisted of two gypsum management procedures (with 1.4 Mg ha^-1 and without application) associated with two water conditions (with and without water restriction). The water conditions were promoted by partially covering the soil with plastic tarpaulin sheets. Soybean was grown in the crop years 2018/19 and 2019/20 to assess root attributes and yield and were analyzed soil chemical characteristics. Water restriction reduced soybean yield by 11.4 and 36.8% in the 2018/19 and 2019/20 harvests, respectively, whereas there was no response to gypsum application. The plants’ root system was not affected by the water conditions or gypsum management. It was concluded that water restriction reduces soybean yield, and agricultural gypsum does not mitigate such loss under the evaluated conditions, even though it positively changes some soil chemical parameters.