01815naa a2200229 a 450000100080000000500110000800800410001910000180006024501410007826000090021952010770022865000230130565000160132865000190134465000170136370000240138070000160140470000140142070000150143470000160144977301200146511340982023-12-13       2023    bl uuuu     u00u1 u    #d1 aGIROTO, A. S.  aEffect of UreabHydroxyapatite Composites for Controlled-Release Fertilization to Reduce P Complexation in Soils.h[electronic resource]  c2023  aPhosphorous fixation in the soil is the most limiting factor for P-management, and previous studies have indicated that coupling nanoparticulated P sources (e.g. hydroxyapatite) in adequate matrices (nanocomposites) can increase nutrient uptake. However, how the nanocomposite affects the P fixation is still an open question. Herein we describe X-ray absorption near edge structure (XANES) experiments to investigate the role of phosphate fertilizer (P) composite in reducing P complexation in soil. Experiments in a greenhouse (maize cultivation) and soil incubation comparatively revealed that a composite formed by the dispersion of hydroxyapatite (phosphate source) into urea could increase the production of dry matter (compared to monoammonium phosphate, MAP), keeping the residual P available in the soil for future cultivations (i.e. not strongly bonded to minerals). This behavior was evidenced by P-XANES, which indicated that the composite induced the bonding of remnant P to more labile organic fractions instead of mineral phases, as seen in MAP cultivation.  aControlled release  afertilizers  aP-complexation  aP-speciation1 aGUIMARAES, G. G. F.1 aMAJARON, V.1 aKLAIC, R.1 aAVANSI, W.1 aRIBEIRO, C.  tCOMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS , Philadelphia, Pennsylvania United Statesgv. 54, p. 1-11, 2023.