TY - JOUR ID - 56746 TI - The Effect of Nano vs Micro Iron Oxide on Phosphorus Availability and Fractionation in Calcareous Soils JO - Iranian Journal of Soil and Water Research JA - IJSWR LA - en SN - 2008-479X AU - Raouf Yazdi Nejad, salman AU - Fotovvat, Amir AU - khorasani, Reza AU - Feizi, Hasan AU - Karimi karouyeh, Alireza AD - Graduate Student, soil sciences, faculty of Agriculture, Ferdowsi University of Mashhad AD - Associate Professor, Faculty member of Ferdowsi University of Mashhad AD - Assistant Professor, Faculty member of Ferdowsi University of Mashhad AD - Assistant Professor, Faculty member of Torbat Heidarrieh University Y1 - 2015 PY - 2015 VL - 46 IS - 3 SP - 579 EP - 587 KW - Calcium Phosphate KW - Inorganic phosphorus KW - Iron Phosphate KW - Occluded Phosphorus DO - 10.22059/ijswr.2015.56746 N2 - Phosphorus exhibits complex chemical behavior in response to such various soil factors as iron oxide. The effect of size and concentration of iron oxide particles on different forms of phosphorous in soil as well as its availability to plants was investigated. The study was conducted in the form of a factorial arranged  experiment based upon a completely randomized design of four replications along with five levels of bulk iron oxide vs nano iron oxide (0, 500, 1000, 5000, 10000 mgkg-1).The results revealed that the use of iron oxide nanoparticles in all the samples reduced Olsen P concentration. The concentration was reduced from 3 mgkg-1 in bulk sample to 0.9 mgkg-1 in 5000 mgkg-1 nanoparticle sample, while this effect was not observed in the case of bulk iron oxide. A significant variation in Ca2-P, Ca8-P concentration was observed with changes in size and concentration of iron oxide, especially in Nano treatments. The changes in Ca10-P levels in the case of nano treatments were greater than those in bulk treatments, but not statistically significant. Iron oxide concentration significantly affected the level of Fe-P form. O-P form showed significant difference (compared with blank) only in the case of 10000 mgkg-1 of nano iron oxide. UR - https://ijswr.ut.ac.ir/article_56746.html L1 - https://ijswr.ut.ac.ir/article_56746_6ecbe051f7fc98e5b1fdfd4f9944a821.pdf ER -