Effects of the earthworm Pontoscolex corethrurus on rice P nutrition and plant-available soil P in a tropical Ferralsol
BLANCHART, Eric
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes [UMR Eco&Sols]
See more >
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes [UMR Eco&Sols]
BLANCHART, Eric
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes [UMR Eco&Sols]
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes [UMR Eco&Sols]
BECQUER, Thierry
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes [UMR Eco&Sols]
< Reduce
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes [UMR Eco&Sols]
Language
en
Article de revue
This item was published in
Applied Soil Ecology. 2021-04, vol. 160, p. 103867
Elsevier
English Abstract
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 ...Read more >
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.Read less <
English Keywords
Endogeic earthworms
32P-labeling
Isotopic dilution
L-value
Upland rice
Madagascar
ANR Project
Agricultural Sciences for sustainable Development - ANR-10-LABX-0001
MUSE - ANR-16-IDEX-0006
MUSE - ANR-16-IDEX-0006
Origin
Hal imported