Lowland soils are seasonally flooded for rice cultivation and undergo alternate oxidation and reduction conditions, which modify the soil solid mineral phase and the dynamics of highly reactive elements such as phosphorus. Low-crystallinity forms of iron oxides and hydroxides become predominant with time. They could be the most important components in phosphorus adsorption during dry periods, and could control phosphorus release after flooding. The objective of this study was to evaluate the maximum phosphorus adsorption capacity (MPAC) of some lowland […]

The objective of this study was to evaluate the effects of P rates and placement on P uptake, leaf P use efficiency (PUE), and grain yield of corn (Zea mays) grown in a Yellow Argissol soil, typical of the coastal tablelands.Rates of 0, 45, 90, 135 and 180kgha-1 of P2O5 were applied in either the rows or broadcast.The study was carried out during the rainy season, from June to September of 1998, at Umbaúba Experimental Station, at Umbaúba (SE), Brazil.Broadcast […]

The existence of soil exchangeable Al in toxic levels inhibits root growth and elongation, with negative effects on water and nutrient uptake, especially of P. Thus, as soil P increases, plants become less dependent on a large root system, that may decrease crop response to liming. This study was carried out to evaluate the effect of liming and phosphorus fertilization on corn yield. The experiment was conducted in Lages, Southern Brazil, from 1994 to 1998, in a clayed Oxisol (Hapludox) […]