Tree planting experiments were established in southeastern Ontario on old pastures with shallow soil over limestone bedrock known to have frequent moisture deficits during the growing seasons. Wedge-shaped pieces of solid peat, saturated with water, were placed at the bottom of a planting hole to supply water to the roots during the early stages of growth and prevent dessiccation during severe drought conditions. The survival of trees planted with peat wedges was higher than those planted without, particularly in the year when soil moisture was most frequently within the wilting range. Additional experience is needed to realize the full potential of this method.Des essais de plantation d'arbres ont Bte effectues dans le sud-est de I'Ontario sur d'anciens champs pltures. Ces terrains sont caracteris6s par un sol superficiel sur calcaire presentant des deficiences en humidit6 pendant la saison de croissance. On placa au fond des trous de plantation des morceaux de tourbe solide saturee d'eau et affectant la forme d'un coin afin de fournir I'eau necessaire aux racines pendant les debuts de la croissance et aussi pour prevenir tout dess6chement du milieu durant les conditlons de secheresse. Ainsi, la suwie des arbres plantes et jouissant des coins de tourbe fut plus grande que celle des tiges plantees sans cette tourbe pressee, et plus precisement h I'epoque oh I'humidite du sol se situait B I'interieur de la limite du fl6trissement. L'auteur recommande d'autres essais afin de preciser davantage le potentiel de cette methode.
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