Celi, L

Martin, M.

Martinengo, S.

Said-Pullicino, D.

Schiavon, M.

English

Institutional Research Information System University of Turin

INTRODUCTIONIn all the treatments Fe plaque formationwas higher during the early vegetativestages, then decreased in the reproductivephases. At tillering DFL produced a loweramount of plaque then WFL and AWD, in linewith the delay in Fe(II) release (upper-caseletters). In the vegetative phases plaqueswere mainly composed of amorphous Fe(hydro)oxides. Conversely with plantdevelopment, crystalline forms started toappear (lower case letters). In AWDcrystallization was less pronunced comparedto DFL and WFL, according to the higher P:Femolar ratio in porewaters.The pronunceddecrease of Fe plaque during stemelongation could be attributed to the high Pdemand by plants. Thus, the plant strategiesto acquire P may favor Fe plaque dissolutionand the subsequent P relase for plant uptake. Fe(II) and P release in porewaters Fe plaque formationMATERIALS & METHODS Soil flooding timing strongly impacted the temporal release of Fe and P in porewater. As a consequence Fe plaque formationwas different in the tested water management techniques. The results from the wet chemical methods showed the relationship between plant P uptake and Fe plaque crystalline ratio.  The determination of Fe  plaque mineral composition could be the key point to better understand the role of this pool on Pavailability for rice plants.Further investigation may involve the application of synchrotron techniques.  Research carried out in the framework of the P-RICE research project " Fosforo in risaia: equilibriotra produttività e ambiente nell’ottica delle nuovepratiche agronomiche " selected with the call forfunding of research projects in agriculture andforestry 2018 of Regione Lombardia. Project fundedwith d.d.s. March 28th - n. 4403CONCLUSIONS & FURTHER INVESTIGATIONSRESULTS AND DISCUSSIONP uptake and Fe plaque The release of Fe(II) to theporewaters increases within 20days after flooding. The earlierrelease observed in WFL and AWD  compared to DFL was  consistent with the delay in soil flooding.  The P release  is subsequent to  Fereductive dissolution only in AWDand WFL. In DFL the effect of Prelease after reductive dissolutionwas less evident, possibly becauseof the higher P demand by plants. Influence of water management on iron:phosphorus  interaction in rice  rhizosphereMartinengo S., Martin M., Schiavon M.,Romani M., Said-Pullicino D.,  Seyfferth A., Celi LMesocosmsexperimentSlipt plotdesign tocompare thecombinedeffect of 3watermanagementand 3 levels ofP fertilizationUniversity of Turin (IT)Ente Nazionale Risi (IT)University of Delaware (DE) During the vegetative phase (stemelongation), the positive correlationbetween plant P uptake andamorphous Fe in plaque was morepronunced at medium and low Pavailability. The correlations withcrystalline Fe in plaque were weaker,suggesting the primary role ofamorphous Fe plaque in regulatingplant P uptake. 

Influence of Water Management on Iron Phosphorus Interaction in Rice Rhizosphere

https://iris.unito.it/bitstream/2318/1900553/1/Martinengo%20poster%20RTWG%202023.pdf

Influence of Water Management on Iron Phosphorus Interaction in Rice Rhizosphere

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