The invention concerns a method of developing tree seedlings, comprising placing seeds on a surface of a growing medium in a container providing air pruning the seedling roots at a depth of 7.62 cm to achieve an improved root mass, wherein the growing medium comprises, by weight: 40% composted rice hulls, 40% pine bark and 20% sand, or 35% composted rice hulls, 35% pine bark, 20% sand and 10% manure； germinating the seeds on the surface of the growing medium to obtain the seedlings； and subjecting the seedlings to air root pruning by growing the seedlings in a bottomless container of about 3 inches deep, and a second air root pruning by growing the seedlings in a bottomless container of about 7.62 cm deep. Furthermore, the invention also concerns a method of developing tree seedlings, comprising the steps of selecting seeds based on seed weight； combining, by weight: 40% composted rice hulls, 40% pine bark and 20% sand, or 35% composted rice hulls, 35% pine bark, 20% sand and 10% manure to obtain a growing medium； placing the growing medium in a first open-bottom container to a depth of 7.62 cm； placing the seeds on the growing medium； stratifying the seeds on the growing medium at 0°C； germinating the seeds on the growing medium； allowing roots of the seedlings to undergo a first air pruning at the 7.62 cm depth； transplanting the air-pruned seedlings from the first open-bottom container to a second open-bottom container to a depth of 10.8 cm； wherein the second open-bottom container is placed at a height of between about 76.2 and 91.44 cm above the ground； and allowing the seedlings to undergo a second root air pruning at the 10.6 cm depth, and the above medium for developing tree seedlings.Изобретение касается способа выращивания рассады деревьев, включающего размещение семян на поверхности среды для роста в контейнере, обеспечивающем воздушное прищипывание корней рассады на глубине 7,62 см для улучшения корневой массы, причем среда для роста включает 40 об.% ком
