Du déchet au fertilisant: étude de cas d'une plante ornementale
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En raison de l'importance des rejets de la station d'�puration, la valorisation des eaux us�es trait�es par leur r�utilisation dans l'irrigation s'av�re indispensable. De m�me, l'utilisation des boues d�shydrat�es dans le compostage, vue leur richesse en �l�ments fertilisants et leur moindre co�t par comparaison au fumier. L'ensemble des analyses physico-chimiques des �chantillons (compost, fumier et eaux us�es trait�es), effectu�es au sein du laboratoire des analyses physico-chimiques de la station d'�puration, r�v�lent la conformit� de ces �chantillons aux deux normes Tunisiennes NT 106.20 et NT 106.03. Pour mettre en valeur l'efficacit� du compost, une �tude comparative de la croissance du G�ranium a �t� men�e dans deux s�ries de pots (la premi�re s�rie avec compost et la deuxi�me avec le fumier de bovins). Le suivi de la croissance a mis en �vidence une am�lioration de la longueur des entrenoeuds, ainsi qu'une augmentation du nombre de bourgeons et de boutons floraux chez la plante �tudi�e, lorsque celle-ci �tait cultiv�e sur compost par rapport au fumier. Il en ressort que l'apport des boues d�shydrat�es assure une meilleure croissance de la plante �tudi�e que le fumier.
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