01844naa a2200241 a 450000100080000000500110000800800410001902400550006010000180011524501410013326000090027430000140028352010850029765300230138265300190140565300170142470000250144170000160146670000140148270000150149670000160151177300750152721642892024-06-11       2024    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1080/00103624.2023.22686452DOI1 aGIROTO, A. S.  aEffect of UreabHydroxyapatite Composites for Controlled-Release Fertilization to Reduce P Complexation in Soils.h[electronic resource]  c2024  a302 - 312  aABSTRACT Phosphorous 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  aP-complexation  aP-speciation1 aGUIMARÃES, G. G. F.1 aMAJARON, V.1 aKLAIC, R.1 aAVANSI, W.1 aRIBEIRO, C.  tCommunications in Soil Science and Plant Analiysisgv. 55, n. 3, 2024.