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

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