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Hygrométrie

hygrométrie

Hygrométrie

Dans nos appartements,l`humidité atmosphérique est généralement insuffisante pour la majeur partie

des plantes intérieur.Or,ce facteur est déterminant dans le développement de certaines plantes,comme

les broméliacées ou orchidées.En effet,leurs feuilles duveteuses,pourvues d`une multitude de minuscules

stomates aspirants,leur permettent d`absorber l`humidité de l`air.Le développement de cette fonction des

feuilles a entraîné,chez certaines espèces,l`atrophie totale des racines.Le cas le plus connu est celui du

tillandsia ou barbe-de-vieillard(Tillandsia usneoides),de la famille des broméliacées,qui doit son nom

aux longs et fins filaments gris et pendants qui évoquent une barbe.

Alors que la plupart des plantes d`intérieur préfèrent une hygrométrie de 60 à 70%,l`humidité atmosphérique

moyenne dans nos habitation dépasse rarement 40%.Le brunissement et le dessèchement des bords et des

pointes des feuilles sont les symptômes caractéristiques d`un manque d`humidité.L`absence d`efflorescence

des boutons ou la chute des bourgeons et des fleurs sont aussi souvent dus à une humidité atmosphérique

trop faible.Un air trop sec favorise les attaques d`araignées rouges,de thrips ou d`autres parasites.

Plus les feuilles des plantes sont fines et tendres,plus vite apparaissent les symptômes une hygrométrie insuf

fisante.À l`inverse,plus le feuillage est épais et coriace,plus il est résistant.Ce sont les cactées et plantes

grasses qui supportent le mieux un air sec.

Les plantes qui préfèrent une humidité atmosphérique plus élevée peuvent être régulièrement vaporisées

avec de l`eau.Ce traitement est à déconseiller pour les plantes aux feuilles duveteuses(comme la violette d`-

Ursambara,le gloxinia,le streptocarpe,le platycerium aussi appelé corned`élan)qui,vaporisées,

se couvrent de taches blanches très peu estétiques.Évitez aussi de vaporiser des fleurs épanouies et tendres

qui,pour la plupart,ne supportent pas l`eau.En été,"brumiser"des plantes exposées au soleil de midi,direct et

intense,risque de "brûler"les feuilles,sur lesquelles les gouttelettes d`eau produisent l`effet d`une loupe au

soleil.Les soirées froides ne se prêtent pas non plus à la vaporisation du feuillage de vos plantes;les feuilles

n`auraient pas le temps de sécher,et des mycoses pourraient facilement apparaître.

"Brumiser" ses plantes ne fournit que des résultats provisoires.Il est plus juducieux d`avoir recours à plusieurs

méthodes pour offrir à la plante l`hygrométrie nécessaire.La méthode la plus simple consiste à rempoter les plantes

ou à placer les pots dans un subsrat qui emmagasine l`eau excessive à l`arrosage et la libère ensuite graduellement

par évaporation.Les billes d`argiles expansée,les fibres de cocos,la lave microporeuse et d`autres rétenteurs d`eau jouent ce rôle.

Si vous ne pouvez recourir à ce genre de méthode,placez le pot dans un cache - pot bien large rempli de tourbe humide;

l`eau qui en évapore augmente directement l`humidité autour de la plante.Il est également recommandée de disposer

le pot sur une large coupe d`eau recouverte d`un fin treillis.Cette structure fait office d`humidificateur.Vous pouvez

également placer le pot dans une soucoupe remplie d`eau et de petits gravillons,qui servent à empêcher tout

contact des racines avec l`eau et,partant à éviter la pourriture des racines.Une très bonne méthode consiste à

installer un humidificateur d`air électrique qui peut être réglé en fonction de l`ygrométrie souhaitée.Si cette

solution est coûteuse,gardez à l`esprit qu`un accroîssement de l`hygrométrie améliore l`atmosphère de nos

habitations et donc,notre bien-être.

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