');background-position:center right 1rem;background-repeat:no-repeat;background-size:1rem;border:var(--idf-border-width-1) solid var(--idf-color-neutral-400);border-radius:var(--idf-border-radius-s);-webkit-box-shadow:none;box-shadow:none;color:var(--idf-color-neutral-700);cursor:pointer;font:unset;height:4rem;padding:var(--idf-spacing-2) var(--idf-spacing-5) var(--idf-spacing-2) var(--idf-spacing-2);-webkit-transition:all .35s ease;transition:all .35s ease;width:100%}.idf-select__select[data-v-ac59e232]:disabled,.idf-select__select[disabled][data-v-ac59e232]{background-color:var(--idf-color-neutral-100);background-image:url('data:image/svg+xml;utf8, 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transparent}.idf-slider__container[data-v-63cbc747]{display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-flex:1;-ms-flex:1;flex:1;justify-items:flex-start;overflow-x:auto;white-space:nowrap}.idf-slider__container[data-v-63cbc747]>*{-ms-flex-negative:0;flex-shrink:0}.idf-slideshow[data-v-cb408abf]{position:relative}.idf-slideshow__btn[data-v-cb408abf]{display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-pack:center;-ms-flex-pack:center;background:none;border:none;cursor:pointer;height:5.6rem;justify-content:center;margin:0;outline:none;padding:0;position:absolute;-webkit-transform:translateY(-50%);transform:translateY(-50%);-webkit-transition:height var(--idf-transition-speed-1) ease;transition:height var(--idf-transition-speed-1) ease;-webkit-transition:width var(--idf-transition-speed-1) ease;transition:width var(--idf-transition-speed-1) ease;width:5.6rem;z-index:var(--idf-z-index-default)}.idf-slideshow__btn--prev[data-v-cb408abf]{left:1.6rem;top:50%}.idf-slideshow__btn--next[data-v-cb408abf]{right:1.6rem;top:50%}.idf-slideshow__btn--disabled[data-v-cb408abf]{color:var(--idf-color-inactive-100)}.idf-slideshow__btn--disabled[data-v-cb408abf]:hover{cursor:default}.idf-slideshow__holder[data-v-cb408abf]{overflow:hidden}@media only screen and (min-width:576px){.idf-slideshow__holder[data-v-cb408abf]{padding:0}}.idf-slideshow__group-list[data-v-cb408abf]{border-radius:var(--idf-border-radius-s);overflow:hidden}.idf-slideshow__list[data-v-cb408abf]{display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-orient:horizontal;-webkit-box-direction:normal;-ms-flex-flow:row;flex-flow:row;list-style:none;margin:0;padding:0;-webkit-transition:-webkit-transform var(--idf-slideshow-timing) ease;transition:-webkit-transform var(--idf-slideshow-timing) ease;transition:transform var(--idf-slideshow-timing) 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100%}.idf-slideshow__indicator[data-v-cb408abf]{background-color:var(--idf-color-neutral-100);border-radius:100px;bottom:1.6rem;display:-webkit-box;display:-ms-flexbox;display:flex;gap:var(--idf-spacing-1);padding:var(--idf-spacing-2);position:absolute;right:1.6rem;z-index:var(--idf-z-index-default)}.idf-slideshow__indicator-dot[data-v-cb408abf]{background-color:var(--idf-color-neutral-400);border-radius:100%;height:var(--idf-spacing-2);width:var(--idf-spacing-2)}.idf-slideshow__indicator-dot[data-v-cb408abf]:hover{background-color:var(--idf-color-neutral-700);cursor:pointer}.idf-slideshow__indicator-dot.active[data-v-cb408abf]{background-color:var(--idf-color-main-400)}.idf-standard-inputs[data-v-83079502]{display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-orient:vertical;-webkit-box-direction:normal;-ms-flex-direction:column;flex-direction:column}.idf-standard-inputs-message[data-v-83079502]{display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-align:start;-ms-flex-align:start;align-items:flex-start;font-size:1.2rem;margin-top:.4rem}.idf-standard-inputs-label[data-v-83079502]{font-size:var(--idf-font-size-m);line-height:var(--idf-line-height-m);margin-bottom:var(--idf-spacing-1)}.idf-standard-inputs-label[data-v-83079502] .idf-text-icon{font-weight:700}.idf-standard-inputs[data-v-83079502] .idf-text-icon{color:var(--idf-color-neutral-700)}.idf-standard-inputs[data-v-83079502] .idf-text-icon svg{-ms-flex-negative:0;flex-shrink:0;height:1.8rem;margin-top:.3rem;width:1.8rem}.idf-standard-inputs[data-v-83079502] .idf-text-icon svg path{fill:currentColor}.idf-standard-inputs.has-error .idf-standard-inputs-message[data-v-83079502] path{fill:var(--idf-color-error-400)}.idf-standard-inputs.is-disabled[data-v-83079502] .idf-text-icon{color:#d2d2d2;pointer-events:none}.idf-standard-inputs.is-mandatory .idf-standard-inputs-label[data-v-83079502]{display:-webkit-inline-box;display:-ms-inline-flexbox;display:inline-flex}.idf-standard-inputs.is-mandatory .idf-standard-inputs-label[data-v-83079502]:after{color:var(--idf-color-error-400);content:" *";white-space:pre}.idf-read-more__button[data-v-aa68187c]{-webkit-appearance:unset;-moz-appearance:unset;appearance:unset;background-color:unset;border:unset;cursor:pointer;font:unset;padding:unset;text-align:unset;--idf-read-more-background:linear-gradient(180deg,hsla(0,0%,100%,.25),#fff 75%);position:relative;-webkit-box-pack:center;-ms-flex-pack:center;color:var(--idf-color-neutral-700);display:var(--idf-read-more-btn-display);font-weight:700;justify-content:center;width:100%}@media only screen and (min-width:768px){.idf-read-more__button[data-v-aa68187c]{display:var(--idf-read-more-md-btn-display)}}.idf-read-more__button--left[data-v-aa68187c]{-webkit-box-pack:start;-ms-flex-pack:start;justify-content:flex-start}.idf-read-more__button-label[data-v-aa68187c]{position:relative}.idf-read-more__button[data-v-aa68187c]:focus,.idf-read-more__button[data-v-aa68187c]:hover{text-decoration:underline}.idf-read-more__button[data-v-aa68187c]:before{background:var(--idf-read-more-background);bottom:0;content:"";height:calc(var(--idf-read-more-line-height)*var(--idf-read-more-masked-lines));left:0;pointer-events:none;position:absolute;right:0;-webkit-transition:height var(--idf-transition-speed-1) ease;transition:height var(--idf-transition-speed-1) ease}.idf-read-more__button.secondary-gradient[data-v-aa68187c]:before{--idf-read-more-background:linear-gradient(180deg,hsla(60,13%,94%,0),#f2f2ee 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(min-width:768px){.idf-read-more__wrapper--has-content-to-expand[data-v-aa68187c]{max-height:calc(var(--idf-read-more-line-height)*var(--idf-read-more-md-max-shown-lines))}}.idf-anchor-navigation[data-v-4b611517]{background:var(--idf-color-neutral-100);border-radius:var(--idf-border-radius-m);-webkit-box-shadow:var(--idf-shadow-light);box-shadow:var(--idf-shadow-light);position:sticky;top:0;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;width:100%}.idf-anchor-navigation__title[data-v-4b611517]{font-weight:700}.idf-anchor-navigation__icon[data-v-4b611517]{-webkit-transform:rotate(180deg);transform:rotate(180deg);-webkit-transition:-webkit-transform .35s ease;transition:-webkit-transform .35s ease;transition:transform .35s ease;transition:transform .35s ease,-webkit-transform .35s 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Les biostimulants sont utilisés pour améliorer l'absorption des éléments nutritifs par les
végétaux et pour renforcer leur résistance aux stress abiotiques. De nombreuses études ont
montré l’efficacité de ces produits sur de nombreuses cultures où les biostimulants
contribuent à une meilleure expression de leur potentiel génétique, et contribuent à
l’augmentation des rendements et la qualité des récoltes dans des environnements
climatiques défavorables.
L’utilisation des biostimulants mérite un peu d’approfondissement et quelques informations
techniques pour mieux comprendre ses intérêts.
Qu’est-ce qu’un biostimulant ? Pour comprendre ce qu’est un biostimulant, il est nécessaire d’avoir quelques explications
réglementaires.
Depuis 2019, le règlement UE 2019/1009 encadre les biostimulants et les intègre dans la
famille des matières fertilisantes et supports de culture. Ce cadre légal permet de
différencier les biostimulants de tout autre produit de nutrition des plantes (comme les
engrais).
D’après la Commission européenne, les biostimulants sont : “des produits qui stimulent les
processus de nutrition des végétaux indépendamment des éléments nutritifs qu’ils
contiennent, dans le seul but d’améliorer une ou plusieurs caractéristiques des végétaux ou
de leur rhizosphère.” Les caractéristiques sont disponibles de façon détaillée sur le site de
l’Académie des biostimulants .
Des biostimulants pour améliorer l’efficience des éléments nutritifs La tension sur les prix et les incertitudes d'approvisionnement des matières premières, et
notamment des fertilisants, contraint les agriculteurs à utiliser ces produits avec sobriété.
L’apport d’éléments nutritifs doit ainsi être optimisé et les biostimulants montrent ainsi toute
leur importance dans une approche globale de la nutrition des cultures.
Pour améliorer le développement racinaire, certains biostimulants à base d’algues et/ou
d’acides fulviques vont favoriser l’absorption des éléments nutritifs. En cours de cycle, les
produits à base d’extraits végétaux concentrés vont, quant à eux, permettre un meilleur
développement aérien et optimiser la photosynthèse conduisant à une croissance plus
harmonieuse.
Une solution pour préparer le printemps Au début du printemps, la vigne est régulièrement soumise à des stress abiotiques et il est
primordial de l’aider à reprendre le cours de sa croissance. Là où l’apport direct d’éléments
nutritifs peut s’avérer inefficace, l’utilisation de biostimulants permet une meilleure
absorption des nutriments et une meilleure résistance à cette situation de stress en agissant
sur sa physiologie.
Les biostimulants à base d’algues peuvent être pertinents dans ce cas mais d’autres
substances ont également fait leurs preuves (c’est le cas d'extraits végétaux à base de
triacontanol ou des hydrolysats de protéines par exemple).
Les choix se font selon les situations culturales et les objectifs recherchés.
Réduire les conséquences des stress abiotiques en fin de croissance L’été est une période où les changements climatiques s'expriment fortement. Ces variations
sont régulières et viennent impacter immédiatement les cultures. Pour réduire les
conséquences de la sécheresse et de la surexposition au soleil, l’utilisation de biostimulants
est très intéressante.
Utilisés en amont de ces situations de stress, les biostimulants ont un effet positif sur le
feuillage de la vigne (photosynthèse plus active). Il a également été constaté que certains
biostimulants (à base de triacontanol notamment) avaient un impact positif sur la mise en
réserve des éléments nutritifs pour l’année suivante tout en permettant une amélioration de
la production de l’année en cours.
Plusieurs résultats d’essais sont disponibles à ce sujet.
Biostimulants en vigne : ce qu’il faut retenir En cinq ans, le marché des biostimulants a bien évolué et il bénéficie aujourd’hui d’un cadre
réglementaire européen. Il est important de n’utiliser que des biostimulants ayant obtenus
une autorisation de mise sur le marché (AMM) pour des raisons d’efficacité agronomique et
de sécurité d’emploi.
S’ils n’ont pas vocation à remplacer les engrais, les biostimulants ont des effets prouvés sur
l’amélioration de l’absorption des éléments nutritifs. Ils soutiennent également les grandes
fonctions physiologiques. En vigne, comme cela est le cas pour d’autres cultures, l’utilisation
des biostimulants peut se faire à chaque étape du cycle cultural avec une efficience accrue
dans des périodes de stress climatiques.
Des programmes d’application spécifiques sont proposés en permettant de trouver une
solution adaptée aux besoins de chaque situation rencontrée.
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