Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Growth and nutrition of container-grown ponderosa pine seedlings with controlled-release fertilizer incorporated in the root plug. | Ann. For. Sci. 61 2004 117-124 INRA EDP Sciences 2004 DOI forest 2004002 117 Original article Growth and nutrition of container-grown ponderosa pine seedlings with controlled-release fertilizer incorporated in the root plug Zhaofei FANa James A. MOOREb David L. WENNYb a Department of Forestry The School of Natural Resources 203 ABNR Building University of Missouri-Columbia Columbia MO 65211 USA b Department of Forest Resources University of Idaho Moscow ID 83844-1133 USA Received 28 February 2002 accepted 22 April 2003 Abstract - Prior to sowing seeds three controlled-release fertilizers fast release FR moderate release MR and slow release SR were incorporated into the growing media at rates of or g as supplements to nursery supplied soluble fertilizer to grow containerized ponderosa pine Pinus ponderosa Doug. ex Laws seedlings in the greenhouse. At lifting the stem diameter height and total mass of fertilized seedlings ranged from 14 to 29 15 to 22 and 39 to 100 larger than those of the unfertilized seedlings respectively. FR provided more balanced nutrients than did MR or SR. The root growth potentials of ponderosa pine treated with g of MR or SR were much lower than those of other treatments indicating that a g rate of MR or SR was too high for the seedlings. The estimated best dosages for maximum caliper and height growth were and g for FR MR and SR fertilizers respectively. Pinus ponderosa Doug. Ex Laws controlled-release fertilizer biomass root growth potential foliar nutrient concentration Résumé - Croissance et nutrition de plants de pin ponderosa élevés en container avec apport d engrais à liberation contrôlée incorporée dans le godet. On a incorporé avant semis dans le milieu de culture des engrais à libération contrôlée libération rapide FR libération modérée MR et libération lente SR à des doses de 0 8 1 6 et 3 2 g en supplément de l apport d engrais soluble utilisé pour l élevage en container sous serre de plants
