Contrasting tree effects on soil P sorption and availability on a Xanthic Ferralsol.
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The 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.
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Agrofloresta, Cultivo multiple, Root, Fertilizers application, Potash fertilizers, Absorção, Adubação, Bactris Gasipaes, Cupuaçu, Conservação do Solo, Floresta Tropical Úmida, Fertilizante Fosfatado, Pueraria Phaseoloides, Raiz, Pupunha, Theobroma Grandiflorum, adsorption, agroforestry, multiple cropping, soil conservation, tropical rain forests