%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Trap, Jean
%A Blanchart, Eric
%A Ratsiatosika, O.
%A Razafindrakoto, M.
%A Becquer, Thierry
%A Andriamananjara, A.
%A Morel, C.
%T Effects of the earthworm Pontoscolex corethrurus on rice P nutrition and plant-available soil P in a tropical Ferralsol
%D 2021
%L fdi:010081032
%G ENG
%J Applied Soil Ecology
%@ 0929-1393
%K Endogeic earthworms ; P-32-labeling ; Isotopic dilution ; L-value ; Upland rice ; Madagascar
%K MADAGASCAR ; ZONE TROPICALE
%M ISI:000618081000008
%P 103867 [5 ]
%R 10.1016/j.apsoil.2020.103867
%U https://www.documentation.ird.fr/hor/fdi:010081032
%> https://www.documentation.ird.fr/intranet/publi/2021/03/010081032.pdf
%V 160
%W Horizon (IRD)
%X We conducted a greenhouse experiment in mesocosms for 28 days to assess the effects of the endogeic earthworm Pontoscolex corethrurus on plant-available soil phosphorus (P) and rice (Oryza sativa) P nutrition in a Malagasy Ferralsol. To assess plant-available soil P, we determined the L-value by measuring the specific activity of P taken up from the soil by rice and by applying the isotopic dilution principle. Despite earthworm mortality, P. corethrurus significantly increased rice shoot biomass (+26%) and P nutrition (+65%), confirming that the soil used for the experiment was P-deficient. The L-value also markedly increased from 6.8 +/- 0.9 to 14.2 +/- 1.3 mg P mesocosm(-1) in the presence of P. corethrurus. We estimated that the orthophosphate ions released due to earthworm mortality contributed to 30% of the L-value increase. We attributed the remaining 70% increase to the solubilization of native soil P during its transit through the digestive tract. Thereafter, we discussed the sources of uncertainty associated with the L-value calculation and their utilization to assess earthworm effects on P availability in further studies.
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