');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-91554806]:disabled,.idf-select__select[disabled][data-v-91554806]{background-color:var(--idf-color-neutral-100);background-image:url('data:image/svg+xml;utf8, 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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-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-standard-inputs[data-v-2c836b79]{--idf-icon-fill-color:currentColor;color:var(--idf-color-neutral-700);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-2c836b79]{-webkit-box-align:start;-ms-flex-align:start;align-items:flex-start;display:-webkit-box;display:-ms-flexbox;display:flex;margin-top:var(--idf-spacing-1)}.idf-standard-inputs-label[data-v-2c836b79]{font-weight:700;margin-bottom:var(--idf-spacing-1)}.idf-standard-inputs[data-v-2c836b79] 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Accueil Toutes les actualités agricoles Comment connaitre la qualité de son sol ? Comment connaitre la qualité de son sol ? La matière organique La matière organique joue quatre rôles majeurs dans le sol :
Amélioration de la stabilité structurale : elle limite la battance dans les sols à dominante limoneuse et limite la prise en masse dans les sols à dominante argileuse
Contribution à stocker les éléments nutritifs. 1 % de MO = 2meq de CEC
Augmentation de la réserve en eau. 1 unité de MO retient 400 fois son poids en eau.
Alimentation de l’activité biologique du sol. L’activité biologique est représentée par les vers de terres, les insectes du sol, les bactéries, les champignons, etc
La matière organique est constituée de deux fractions :
Une fraction labile : matière organique fraîche en cours de dégradation. C’est l’essence de la vie du sol et des plantes
Une fraction stable : C’est la matière organique qui constitue le squelette du sol. Cette matière organique évolue peu.
Relation taux de matière organique et argile Le chercheur Pascal BOIVIN (haute école du paysage, d’ingénierie et d’architecture de Genève) a mis en évidence une corrélation entre le ratio matière organique/ argile et la qualité de l’état structural du sol. La matière organique a un taux optimal dans le sol : il est de 17 % de la masse d’argile. En dessous de ce seuil, la qualité structurale risque d’être dégradée.
Valeurs repères du taux de matière organique / argile :
Cela signifie que si le sol contient :
10 % d’argile => il devra y avoir 1,7 % de matière organique
20 % d’argile => il devra y avoir 3,4 % de matière organique
30 % d’argile => il devra y avoir 5,1 % de matière organique
Source : Pascal BOIVIN (Suisse) Le graphique de Pascal BOIVIN basé sur une étude menée sur 1200 parcelles, montre que plus le ratio de matière organique / argile est faible, plus les chances d’avoir une structure dégradée est importante (plus la note du tes VESS est proche de 1, plus la structure de sol est bonne).
Qu’est-ce que le test VESS (Visual Evaluation of Soil Structure) ?
l s’agit d’une méthodologie développée par Ball et Al en 2007. Elle consiste à évaluer la qualité structurale du sol avec une simple bêche.
Pour effectuer ce test, il suffit de s’équiper d’un guide pour la méthode (papier ou application smartphone VESS), d’une bêche et d’un mètre. Le résultat sera exprimé sous forme de note allant de 1 à 5. Elle est accessible à tous les agriculteurs soucieux de l’état structural de leurs sols.
Quels enseignements en tirer pour son exploitation ? Le ratio matière organique / argile va nous renseigner sur le risque que l’on prendra à introduire le semis direct sur une parcelle ou une exploitation.
Moins les argiles seront complexées avec la matière organique plus les problèmes liés au semis direct (sillon de semis lissé, semelles de compaction, prise en masse, etc) seront fréquents. Cela veut aussi dire que plus le sol sera riche en argiles, plus la transition vers le semis direct sera longue ou très complexe.
Ce ratio n’est pas figé dans le temps, il peut évoluer. Pour cela, l’agriculteur devra favoriser l’augmentation du taux de matière organique puisque le taux d’argile est fixe. Ainsi de cette optique, on peut :
Limiter le travail du sol.
Réduire le recours à l’irrigation.
Utiliser des engrais organiques.
Augmenter les restitutions : résidus de cultures, couverts végétaux.
Favoriser les cultures à forts résidus organiques.
Si le travail du sol est encore présent sur l’exploitation, une diminution progressive de la profondeur de travail du sol, permet de concentrer la matière organique dans les premiers centimètres de sol afin de créer un lit de semence de plus en plus favorable.
Comment calculer ce taux ? Tout d’abord il faut disposer d’une analyse de terre où une granulométrie décarbonatée a été réalisée. Cette analyse n’est pas systématique dans l’analyse de base. Il faut prendre l’option « granulométrie » pour disposer de ces informations.
Exemple :
Le taux d’argile de cette parcelle est de 36,3 % ce qui veut dire que le taux de MO optimale est de 6,2 % (36,3 % x 17 %), pour avoir une structure stable.
Dans cet exemple le ratio MO / Arg est donc de : (3,2 / 36,3) x 100 = 8,8 %.
Par conséquent, la phase de transition vers du semis direct sera longue. L’agriculteur devra pendre beaucoup de précautions pour ne pas dégrader sa structure et la contrôler régulièrement afin de ne pas implanter une culture sur un sol repris en masse. Une période de TCS (Techniques Culturales Simplifiées) avec une profondeur de travail de sol remontée progressivement pourra permettre de concentrer la matière organique dans les premiers centimètres de sol.
Conclusion Le ratio matière organique / argile peut nous donner des indications très importantes sur le comportement d’une parcelle puisque la matière organique est un élément central de la fertilité physique, chimique et biologique des sols.
De plus il peut être très utile si vous désirez pratiquer l’agriculture de conservation des sols, en effet, cet indicateur nous permettra d’avoir des informations sur la faisabilité des techniques de simplification de travail du sol en fonction de son taux d’argile. Pour cela, si vous n’avez pas cette donnée, il faudra bien penser à cocher cette option lors de votre prochaine analyse de sol.
Service Agronomie, Conseils, Innovation - mai 2020
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