@article{grans_isik_purnell_peszlen_mckeand_2021, title={Genetic Variation and the Effect of Herbicide and Fertilization Treatments on Wood Quality Traits in Loblolly Pine}, volume={67}, ISSN={["1938-3738"]}, url={https://doi.org/10.1093/forsci/fxab026}, DOI={10.1093/forsci/fxab026}, abstractNote={Abstract
               The effect of silvicultural treatments (herbicide, fertilization, herbicide + fertilization) and the interactions with genetic effects were investigated for wood quality traits in a 16-year-old loblolly pine (Pinus taeda L.) genetic test established in southwest Georgia, USA. Fertilizer and herbicide treatment combinations were applied multiple times to main plots containing 25 open-pollinated families as sub plots. Significant differences among treatments were found for all traits. Squared acoustic velocity, used as a surrogate for wood stiffness, was higher in herbicide-only plots compared with other treatments. Wood density was considerably lower in fertilization plots. A large proportion of variance observed for wood quality traits was explained by additive genetic effects, with individual-tree heritabilities ranging from 0.78 (ring 7–16 section wood density) to 0.28 (ring 2–6 section wood density). Corresponding family-mean heritability values were well over 0.86. Genotype-by-treatment interactions were nonsignificant for all traits, indicating no need to match families to silvicultural treatments. Wood quality traits had weak genetic correlations with growth and stem quality traits (stem slenderness, sweep, and branch angle) with a range of −0.33 to 0.43, suggesting that recurrent selection on growth or stem quality traits would not adversely affect wood quality in loblolly pine.}, number={5}, journal={FOREST SCIENCE}, publisher={Oxford University Press (OUP)}, author={Grans, Daniel and Isik, Fikret and Purnell, Robert C. and Peszlen, Ilona M. and McKeand, Steven E.}, year={2021}, month={Oct}, pages={564–573} }
 @article{sherrill_bullock_mullin_mckeand_purnell_2011, title={Total and merchantable stem volume equations for midrotation loblolly pine (Pinus taeda L.)}, volume={35}, number={3}, journal={Southern Journal of Applied Forestry}, author={Sherrill, J. R. and Bullock, B. P. and Mullin, T. J. and McKeand, S. E. and Purnell, R. C.}, year={2011}, pages={105–108} }
 @article{sherrill_mullin_bullock_mckeand_purnell_gumpertz_isik_2008, title={An evaluation of selection for volume growth in loblolly pine}, volume={57}, ISSN={["2509-8934"]}, DOI={10.1515/sg-2008-0004}, abstractNote={Abstract
                Total inside-bark volume is the most important selection criterion for productivity in tree breeding programs in the Southeastern U.S. Tree breeders typically estimate total inside-bark volume based on outside-bark diameter at breast height and total height without accounting for stem taper or bark thickness. To make a direct determination of total inside- and outside-bark volume, a loblolly pine (Pinus taeda L.) open-pollinated family trial replicated with cultural treatments of weed control and fertilization was measured. This direct measurement was compared to typical volume estimates. In this trial, approximately 40 individuals from each of 25 open-pollinated first- and second-generation families were destructively sampled in the 13th growing season. Selection for volume using a combined-variable (diameter2 * height) equation was found to be highly effective for making volume gain. There was a high correlation between estimated and directly-measured total inside-bark volumes (0.99). Bark thickness and stem taper had low importance for stem volume selection. There was a positive genetic correlation between bark thickness and diameter at breast height (0.66). This indicates that selection for larger diameters may produce individuals with thicker bark, which may eventually affect total inside-bark volume estimates.}, number={1}, journal={SILVAE GENETICA}, author={Sherrill, J. R. and Mullin, T. J. and Bullock, B. P. and McKeand, S. E. and Purnell, R. C. and Gumpertz, M. L. and Isik, F.}, year={2008}, pages={22–28} }
 @inproceedings{sherrill_mullin_bullock_mckeand_purnell_gumpertz_2005, title={Total inside-bark volume estimation for loblolly pine (Pinus taeda L.) in genetic trials}, booktitle={Proceedings of the 28th Southern Forest Tree Improvement Conference}, author={Sherrill, J. R. and Mullin, T. J. and Bullock, B. P. and McKeand, S. E. and Purnell, R. C. and Gumpertz, M. L.}, year={2005}, pages={123–125} }
 @article{purnell_kellison_1987, title={A tree improvement programme for southern hardwoods}, number={15}, journal={Forest Genetic Resources}, author={Purnell, R. C. and Kellison, R. C.}, year={1987}, pages={72} }