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Home → Publications → Tree Improvement and Genetics → Southern Forest Tree Improvement Conference → 15th Southern Forest Tree Improvement Conference (1979) → Early Growth Of Planted Northern Red Oak As Influenced By Genotype And Nitrogen Fertilization

Early Growth Of Planted Northern Red Oak As Influenced By Genotype And Nitrogen Fertilization

Twenty open-pollinated families of 1-0 seedlings were grown for five years on a well-drained, alluvial site after applying 360 kg/hectare of nitrogen during the first and second years after planting. Mean five-year height of individual families ranged from 2 to 3 meters, and was on the average 47 percent greater than unfertilized controls. After deletion of treatment variance, 16-percent of remaining variance in height was associated with family differences, while the family x fertilization interaction was not significant until the fifth year when it accounted for 8 percent of variance. The genetic correlation between five-year heights in controls and the fertilization treatment, another measure of genotype x environment interaction, had a coefficient of 0.67. Larger trees had both greater numbers of shoot elongation flushes per season and larger individual flushes than poor performers.


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Author(s): Robert E. Farmer, Jr.

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1979