HAL Id: hal-02744315
https://hal.inrae.fr/hal-02744315
Submitted on 3 Jun 2020
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Plant-earthworm partnership to increase crop
productivity in the tropics
Laetitia Bernard, Dinah Razafindrakoto, Malalatiana Razafindrakoto, Laurie
Amenc, Tantely Razafimbelo, Bodovololona Rabary, Eric Blanchart
To cite this version:
Laetitia Bernard, Dinah Razafindrakoto, Malalatiana Razafindrakoto, Laurie Amenc, Tantely
Razafimbelo, et al.. Plant-earthworm partnership to increase crop productivity in the tropics. 5.
In-ternational Symposium on Soil Organic Matter, Sep 2015, Göttingen, Germany. 2015. �hal-02744315�
A"plant(earthworms"partnership"to"increase"crop"produc4vity"in"the"
tropics"
Laetitia Bernard
1*, Dinah Razafindrakoto
2, Malalatiana Razafindrakoto
2, Laurie
Amenc
3, Tantely Razafimbelo
4,Bodovololona Rabary
2and Eric Blanchart
11 Institut de Recherche pour le Développement (IRD), UMR Eco&Sols, LRI, Antananarivo, Madagascar 2 FOFIFA, SPAD Antsirabe, Madagascar
3 Institut National pour la Recherche Agronomique (INRA), UMR Eco&Sols, Montpellier, France 4 Université d’Antananarivo, Laboratoire des Radio-Isotopes (LRI), Antananarivo, Madagascar
EXPERIMENTATION 1 : laboratory experiment
Fresh
casts
communities Bacterial compositionFerralsol Andranomanelatra (Antsirabe) Madagascar
! Pontoscolex corethrurus (endogeous) ! Kynotus parvus (endogeous) ! Dichogaster saliens (epi-endogeous)
Earthworms
mineralization and FOM, SOMPE in guts
Objectives of this study were to:
(1) determine which earthworm species generate the highest MOS mineralization in his gut and which bacterial populations were implied
(2) see whether breeding this most performing earthworm with crops (Oriza sativa) could increase its grain production.
INTRODUCTION :
In#tropical#soils,#the#soil#organic#ma2er#(SOM)#is#an#important#stock#of#nutrients,#and#microorganisms# are# the# only# ones# able# to# remobilize# for# primary# produc?on.# But# such# mineraliza?on# requires# the# energy#contained#in#the#fresh#organic#ma2er#(FOM).#Consequently,#a#FOM#amendment#can#frequently# s?mulate#the#SOM#mineraliza?on#(Priming#Effect).#Endogeous#earthworms,#inges?ng#high#amounts#of# soil,# are# known# to# influence# organic# ma2er# dynamics# because# some# microbial# popula?ons# are# s?mulated#by#physicochemical#condi?ons#of#earthworm#guts.#Guts#condi?ons#are#characterized#by#the# presence# of# mucus# (H2O# and# glycoprotein),# pH# neutral# condi?ons# and# mixing# (increasing# contact#
between# FOM# and# SOM).# In# an# agroecological# context,# endogenous# earthworms# could# s?mulate# nutrient# mineraliza?on# contained# in# SOM# and# favor# crop# produc?on# or# nutri?onal# quality,# which# cons?tute#one#major#challenge#of#South#Countries.## http://www5.montpellier.inra.fr/ecosols/
CONCLUSION
Dichogaster,saliens,is,a,small,endogeous,earthworm,common,to,tropical,areas,and,living,in,the,vicinity,of,plant,
roots.,He,is,able,to,strongly,mineralize,MOS,and,MOF,in,his,gut,,s@mula@ng,some,phylogene@c,families,like,
Flavobacteriaceae.,This,strong,mineraliza@on,should,enrich,casts,in,nutrients,for,crops,benefit.,In,the,present,
case,,rice,presented,an,increase,in,number,of,grains,per,panicles,,which,is,linked,to,the,plant,phosphorus,uptake,
level.,Consequently,,earthworms,inocula@on,could,improve,crop,produc@vity.#
* Laetitia.Bernard@ird.fr Microorganismes CO2 SOM" (nutrients"rich" "N"and"P)" FOM" (energy"rich)# Priming effect N et P SOIL + EW SOIL SOIL + 13C FOM + EW S SW SF SFW SOIL + 13C FOM + EW -500 0 500 1000 1500 2000 2500 3000 3500D. saliens P. corethrurus K. parvus
rat
io
CO2 Guts / CO2 Control soil SOM FOM Priming effect
EXPERIMENTATION 2 : Field experiment
Andranomanelatra Madagascar
! Oriza sativa : 2 plant /pot ! Dichogaster saliens : 0, 4, 8 et 12 specimens /pot ! 4 repetitions ! Eathworms weighting at the end ! Measures of diverse agronomic parameters ! Matrice(de(corrélation((Pearson((n))(: Variables Poids( sec tige((g) Poids(sec racine( (g) P.T( graines final((g) Poids( 100(G.P (g) grains(vides % Nbr$ grains/ panicule Nbr(de( talles/touffe Nbr(de( panicule s/touffe DichogasterPoids(final
(g) Poids(sec(tige((g)( 1 0,510 0,080 40,687 0,545 F0,022 0,749 0,769 F0,085 Poids(sec(racine((g)( 0,510 1 0,210 F0,426 0,302 0,156 0,539 0,528 F0,291 P.T(graines(final((g)( 0,080 0,210 1 F0,116 F0,372 F0,061 F0,005 0,169 F0,114 Poids(100(G.P((g)( 40,687 F0,426 F0,116 1 F0,286 0,430 40,535 40,596 0,354 grains(vides(% 0,545 0,302 F0,372 F0,286 1 F0,081 0,453 0,239 F0,161 Nbr(grains/(panicule F0,022 0,156 F0,061 0,430 F0,081 1 F0,058 F0,129 0,468 Nbr(de(talles/touffe( 0,749 0,539 F0,005 40,535 0,453 F0,058 1 0,844 F0,254 Nbr(de(panicules/touffe( 0,769 0,528 0,169 40,596 0,239 F0,129 0,844 1 F0,103 Poids$final$Dichogaster$(g) F0,085 F0,291 F0,114 0,354 F0,161 0,468 F0,254 F0,103 1 Les$valeurs$en$gras$sont$différentes$de$0$à$un$niveau$de$signification$alpha=0.05 SM P. corethrurus K. parvus D. saliens Bradyrhizobiaceae Gp1 Ktedonobacteraceae Streptomycetaceae Burkholderiaceae Xanthobacteraceae Gp2 Gp4 Solirubrobacteraceae Planctomycetaceae Acetobacteraceae Geodermatophilaceae Flavobacteriaceae Paenibacillaceae Oxalobacteraceae Thermomonosporaceae Chitinophagaceae SOM FOM PE -7 -2 3 -15 -10 -5 0 5 10 15 F 2 (2 5. 22 % ) F1 (65.09 %) Biplot (F1 and F2 axes: 90.31 %)
