A Juvenile-Stage Genetic Test on the Open-Pollination Progenies from Pinus elliottii Engelm Seed Orchard Research on Multi-trait Selection of the Superior Families of Larix olgensis Pulpwood Effect of Selfing on Physiological and Biochemical Characteristics and Cold Resistance of Winter Turnip Rape (Brassica campestris L.) Age Variations in Productivity and Family Selection of Open-Pollinated Families of Korean Pine(Pinus koraiensis) INHERITANCE AND VARIATION OF JUVENILE GROWTH TRAITS IN OPEN POLLINATED FAMILIES OF MASSON PINE‘S NATURAL STANDS Genetic Variations in Pulpwood Qualities of F2 Generation of Open-Pollinated Larch Hybrid Families and Multi-Traits Selection