@article{whittier_hodge_lopez_saravitz_acosta_2021, title={The use of near infrared spectroscopy to predict foliar nutrient levels of hydroponically grown teak seedlings}, volume={7}, ISSN={["1751-6552"]}, DOI={10.1177/09670335211025649}, abstractNote={ Due to a combination of durability, strength, and aesthetically pleasing color, teak ( Tectona grandis L.f.) is globally regarded as a premier timber species. High value, in combination with comprehensive harvesting restrictions from natural populations, has resulted in extensive teak plantation establishment throughout the tropics and subtropics. Plantations directly depend on the production of healthy seedlings. In order to assist growers in efficiently diagnosing teak seedling nutrient issues, a hydroponic nutrient study was conducted at North Carolina State University. The ability to accurately diagnose nutrient disorders prior to the onset of visual symptoms through the use of near infrared (NIR) technology will allow growers to potentially remedy seedling issues before irreversible damage is done. This research utilized two different near infrared (NIR) spectrometers to develop predictive foliar nutrient models for 13 nutrients and then compared the accuracy of the models between the devices. Destructive leaf sampling and laboratory grade NIR spectroscopy scanning was compared to nondestructive sampling coupled with a handheld NIR device used in a greenhouse. Using traditional wet lab foliar analysis results for calibration, nutrient prediction models for nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), sulfur (S), copper (Cu), molybdenum (Mo), magnesium (Mg), boron (B), calcium (Ca), manganese (Mn), iron (Fe), sodium (Na), and zinc (Z) were developed using both NIR devices. Models developed using both techniques were good for N, P, and K (R2 > 0.80), while the B model was adequate only with the destructive sampling procedure. Models for the remaining nutrients were not suitable. Although destructive sampling and desktop scanning procedure generally produced models with higher correlations they required work and time for sample preparation that might reduce the value of this NIR approach. The results suggest that both destructive and nondestructive sampling NIR calibrations can be useful to monitor macro nutrient status of teak plants grown in a nursery environment. }, journal={JOURNAL OF NEAR INFRARED SPECTROSCOPY}, author={Whittier, William Andrew and Hodge, Gary R. and Lopez, Juan and Saravitz, Carole and Acosta, Juan Jose}, year={2021}, month={Jul} }
 @article{hongwane_mitchell_kanzler_verryn_lopez_chirwa_2018, title={Alternative pine hybrids and species to Pinus patula and P. radiata in South Africa and Swaziland}, volume={80}, ISSN={["2070-2639"]}, DOI={10.2989/20702620.2017.1393744}, abstractNote={Through the collaborative efforts of companies affiliated with the International Program for Tree Improvement and Conservation (Camcore), a number of pine hybrids have been produced over the last decade. Many of these have been planted in trials across southern Africa that broadly represent winter and summer rainfall areas, with the latter ranging from warm to cold temperate sites. The five-year survival and growth of the hybrids and other pines in 12 of these trials were compared with Pinus radiata in the winter rainfall, and P. patula in the summer rainfall, regions where these species have been planted extensively. Except for the highest altitude site, where freezing conditions are common, the survival of most hybrids and tropical pines was better than P. patula or P. radiata. This was, in part, attributed to their improved tolerance to the pitch canker fungus, Fusarium circinatum, which was present in the nursery at the time of planting. In the winter rainfall area, the P. elliottii × P. caribaea hybrid, P. maximinoi and, surprisingly, the P. patula hybrids performed well. In the summer rainfall regions, hybrids with tropical parents such as P. caribaea, P. oocarpa and P. tecunumanii were more productive in the subtropical/warm temperate zone and, with increasing elevation, those hybrids crossed with P. patula performed relatively better. The P. patula × P. tecunumanii hybrid, particularly when crossed with low-elevation P. tecunumanii, performed exceptionally across most sites.}, number={4}, journal={SOUTHERN FORESTS-A JOURNAL OF FOREST SCIENCE}, author={Hongwane, Phillip and Mitchell, Glen and Kanzler, Arnulf and Verryn, Steven and Lopez, Juan and Chirwa, Paxie}, year={2018}, pages={301–310} }
 @article{lopez_abt_dvorak_hodge_phillips_2018, title={Tree breeding model to assess financial performance of pine hybrids and pure species: deterministic and stochastic approaches for South Africa}, volume={49}, ISSN={["1573-5095"]}, DOI={10.1007/s11056-017-9609-1}, number={1}, journal={NEW FORESTS}, author={Lopez, Juan L. and Abt, Robert C. and Dvorak, William S. and Hodge, Gary R. and Phillips, Richard}, year={2018}, month={Jan}, pages={123–142} }
 @article{hansen_changtragoon_ponoy_lopez_richard_kjaer_2017, title={Worldwide translocation of teak-origin of landraces and present genetic base}, volume={13}, ISSN={["1614-2950"]}, DOI={10.1007/s11295-017-1170-8}, abstractNote={Teak (Tectona grandis Linn. f.) is one of the major plantation timbers of the world. The species is native to India, Myanmar, Thailand and Laos in South East Asia but was translocated to several countries in Africa and Central and South America during the past century. Today, large areas of plantations are grown outside the species native range. It is speculated that genetic bottlenecks and founder effects combined with new selection pressures under new growing conditions have led to the formation of distinct landraces; this hypothesis is supported by results from international provenance tests. In the present study, we apply genetic markers to identify the likely origin of teak grown outside its native range and examine if the landraces show signs of reduced genetic diversity. We find large variation in the level of diversity among landraces, although not larger than that observed among native populations. We conclude that variation in the studied teak landraces probably reflects their areas of genetic origin rather than severe founder effects created during their introduction. The genetic data suggests that the studied landraces originated from either the semi-moist east coast of India, southern Myanmar or western Thailand. These results indicate that translocation of teak has mainly come from a certain part of the native distribution and that this did not include the widespread natural teak areas of southern, dry interior or western India or northern Myanmar.}, number={4}, journal={TREE GENETICS & GENOMES}, author={Hansen, Ole K. and Changtragoon, Suchitra and Ponoy, Bundit and Lopez, Juan and Richard, John and Kjaer, Erik D.}, year={2017}, month={Aug} }
 @article{lopez_de la torre_cubbage_2010, title={Effect of land prices, transportation costs, and site productivity on timber investment returns for pine plantations in Colombia}, volume={39}, ISSN={["1573-5095"]}, DOI={10.1007/s11056-009-9173-4}, number={3}, journal={NEW FORESTS}, author={Lopez, Juan and De La Torre, Rafael and Cubbage, Frederick}, year={2010}, month={May}, pages={313–328} }
 @article{lopez_cooper_sain_2005, title={Evaluation of proposed test methods to determine decay resistance of natural fiber plastic composites}, volume={55}, number={12}, journal={Forest Products Journal}, author={Lopez, J. L. and Cooper, P. A. and Sain, M.}, year={2005}, pages={95–99} }