The phosphorus cycle in the soil is controlled by physicochemical processes, such as adsorption and desorption, and by biological processes, such as immobilization and mineralization. This study was carried out to evaluate the seasonal variation of phosphorus in the soil microbial biomass (Pm) as related to rates and timing of soluble phosphate application. The experiment was carried out in May 2002 on an Oxisol under no-till for seven years, in Ibirubá, in the southern Brazil. Five rates of soluble phosphate […]

The characterization of several soil phosphorus (P) pools allowed the evaluation of P components not usually monitored in fertilizer soil tests and can help to understand this nutrient’s cycle. The aim of this study was to evaluate the changes in P pools of a Fluventic Eutrochrepts fine clay which had been under long-time sugarcane plantation. In one situation the sugarcane had been cropped for 55 years with and without trash burning prior to harvesting. The other sugarcane plantation, cultivated for 35 years, […]

This study was carried out using soil samples collected from a Podzol grown with orange trees, at Estação Experimental de Umbaúba, Umbaúba-SE (CPATC-EMBRAPA), to evaluate the acid and alkaline phosphatases activities from a coastal tableland soil submitted to different base saturation values (32, 45, 68 and 76.6%) and the relationships between soil characteristics and these activities. Positive responses to the increment of base saturation were observed for pH, organic matter content, available phosphorus and acid and alkaline phosphatases activities, in […]