Accueil Agriculture Acides humiques et amendements organiques : comment redonner vie à un sol fatigué
Acides humiques et amendements organiques : comment redonner vie à un sol fatigué
Réponse rapide : les acides humiques et fulviques sont la fraction la plus active de la matière organique du sol. Ils améliorent sa structure, augmentent sa capacité à retenir l'eau et les nutriments (capacité d'échange cationique) et stimulent la vie microbienne. Ils sont recommandés pour les sols fatigués, pauvres en matière organique ou très minéralisés , et s'appliquent principalement par fertirrigation.
Humiques ou fulviques : quelle différence ?
Acides humiques : grosses molécules qui agissent surtout dans le sol : elles améliorent sa structure et retiennent l'eau et les nutriments.
Acides fulviques : molécules plus petites et solubles, qui aident à transporter les nutriments vers la plante.
Un bon amendement combine les deux.
Signes indiquant que votre sol a besoin d'un amendement
Le sol se compacte ou forme une croûte et l'eau stagne ou ruisselle.
Les engrais « ne font plus d'effet » : les nutriments sont lessivés ou bloqués.
Des années de monoculture ou de fertilisation uniquement minérale.
Racines peu développées ou cultures qui répondent de moins en moins bien chaque saison.
Quel amendement choisir
Produit
Composition
Indiqué pour
Dose indicative
Humus Puro Liquide de léonardite américaine : extrait humique 15 % (12 % humiques, 3 % fulviques), 3 % de K2 O
Sols fatigués et très minéralisés
Fertirrigation 8-10 L/ha
Humus Sólido Concentré solide 100 % soluble : extrait humique 70 % (55 % humiques, 15 % fulviques), 6 % de K2 O
Concentration maximale pour arbres fruitiers, agrumes et légumes
Fertirrigation 15-25 kg/ha
Vitalia Suelo Plus Extraits végétaux avec acides organiques ; 40 % de matière organique
Amélioration générale de la structure et de l'assimilation des nutriments ; également pour gazons et plantes ornementales
10-20 L/ha
Vitalia Suelo Premium Extraits végétaux avec lignosulfonates enrobant Ca, N et K
Activer la vie microbienne ; très bons résultats sur les cultures à cycle court (laitue, épinard, carotte)
Fertirrigation, aspersion ou en plein 10-20 L/ha
Raíz Libre Formulation de la gamme professionnelle
Libérer les nutriments bloqués dans les sols calcaires ou compactés
Nous consulter
Raizan 100 % extraits végétaux hydrolysés, 7 % de K2 O, 2 % d'acides aminés
Renforcer l'activité biologique autour de la racine
Fertirrigation 2 L/ha
Si votre sol ou votre eau sont en plus salins, combinez l'amendement avec un correcteur de sodium comme Equilibrio .
Comment appliquer un amendement humique
Avant ou en début de culture , pour préparer le sol.
Réparti en plusieurs applications tout au long du cycle, plutôt qu'en une seule dose.
Avec les engrais : les humiques améliorent leur assimilation et réduisent les pertes par lessivage.
Questions fréquentes
Qu'est-ce que la léonardite ?
C'est un minéral organique très riche en acides humiques, formé à partir de la décomposition de matière végétale pendant des millions d'années. C'est la source la plus courante des amendements humiques de qualité.
Humique liquide ou solide ?
Le liquide est plus pratique à manier au quotidien ; le solide soluble concentre beaucoup plus de richesse par kilo et se révèle plus économique sur de grandes surfaces.
Combien de temps faut-il pour voir l'effet ?
L'amélioration de l'absorption des nutriments se remarque en quelques semaines ; l'amélioration de la structure du sol est progressive et se consolide avec des applications continues saison après saison.
Vous voulez faire analyser les besoins de votre sol ? Consultez notre équipe technique. Voir aussi : plan de fertilisation par phases de culture .
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