01955nam a2200385 a 450000100080000000500110000800800410001910000210006024500890008126001280017030000120029852008230031065000150113365000170114865000220116565000220118765000260120965000150123565000150125065000210126565000260128665000130131265000270132565000290135265000260138165000120140765000090141965000270142865300170145565300210147265300280149365300230152165300090154470000160155316700342015-06-17       2000    bl uuuu     u00u1 u    #d1 aCAMPOS, C. E. B.  aContrasting tree effects on soil P sorption and availability on a Xanthic Ferralsol.  aIn: GERMAN-BRAZILIAN WORKSHOP ON NEOTROPICAL ECOSYSTEMS, 2000, Hamburg. Programa and abstracts... Hamburg: Universityc2000  ap. 174.  aThe central objective of these work is the investigation of the availability of soil P as affected by two tree species (cupuacu, urucu, pueraria) with widely different P return, in tne Manaus-AM (Brasil). Phosphorus adsorption did not increase with an exposure longer than 8 h. Therefore, adsorption isotherms can be done within 8 h in the studied soils. In general, about 50% of the added P were adsorbed by the soil matrix. The adsorption decreased for soils which received higher amounts of P fertilizer, indicating that adsorption sities were already blocked by previous fertilization. soils under cupuacu adsorbed more of the added P than soil under ururcu (annatto). This can be explained by the high amounts of organic P which is present in soils under urucu as an effect of high P recycling through litterfall.  aadsorption  aagroforestry  amultiple cropping  asoil conservation  atropical rain forests  aAbsorção  aAdubação  aBactris Gasipaes  aConservação do Solo  aCupuaçu  aFertilizante Fosfatado  aFloresta Tropical Úmida  aPueraria Phaseoloides  aPupunha  aRaiz  aTheobroma Grandiflorum  aAgrofloresta  aCultivo multiple  aFertilizers application  aPotash fertilizers  aRoot1 aLEHMANN, J.