@misc{ou_gannon_arellano_polizzotto_2018, title={A Global Meta-Analysis to Predict Atrazine Sorption from Soil Properties}, volume={47}, ISSN={["1537-2537"]}, DOI={10.2134/jeq2017.11.0429}, abstractNote={Atrazine (2‐chloro‐4‐ethylamino‐6‐isopropylamino‐1,3,5‐triazine) is one of the most widely used herbicides worldwide, and groundwater contamination is of concern, especially in heavily used regions and in edaphic conditions prone to leaching. Soil sorption plays an essential role in atrazine environmental fate, yet consistent atrazine risk prediction remains limited. A quantitative meta‐analysis was conducted to characterize the effect of soil properties on atrazine sorption, using 378 previous observations in 48 publications from 1985 to 2015 globally, which included data on soil properties and sorption parameters. A supplemental regional study was conducted to test the derived meta‐analysis models. The meta‐analysis indicated that percentage organic C (OC) was the most important parameter for estimating atrazine sorption, followed by percentage silt, soil pH, and percentage clay. Meta‐analysis and supplemental study models were developed for Freundlich sorption coefficients (Kf) and sorption distribution coefficients (Kd) as a function of OC. The global meta‐analysis models generated positive linear trends for OC with Kf and Kd (R2 = 0.197 and 0.205, respectively). Organic C was highly correlated with Kf and Kd in supplemental experimental study models (R2 = 0.93 and 0.92, respectively), indicating accurate prediction of sorption within the evaluated region. Continental models were investigated, which improved the goodness of fit. Models developed via meta‐analysis may be used to predict atrazine sorption over wide ranges of data, whereas more accurate and refined prediction can be achieved by specific regional models through experimental studies. However, such models could be improved if standardized agroclimatic conditions, soil classification, and other key variables were more widely reported.}, number={6}, journal={JOURNAL OF ENVIRONMENTAL QUALITY}, author={Ou, Ling and Gannon, Travis W. and Arellano, Consuelo and Polizzotto, Matthew L.}, year={2018}, pages={1389–1399} }
 @article{jeffries_gannon_ou_2016, title={Effect of Indaziflam Applications on 'Tifway 419' Bermudagrass Growth}, volume={108}, ISSN={["1435-0645"]}, DOI={10.2134/agronj2015.0352}, abstractNote={Indaziflam {N‐[(1R,S)‐2,3‐dihyrdo‐2,6‐dimethyl‐1H‐inden‐1‐yl]‐6‐(1‐fluorethyl)1,3,5‐triazine‐2,4‐diamine} is a preemergence herbicide for annual weed control in turfgrass systems. Following indaziflam U.S. registration in 2010, sporadic cases of hybrid bermudagrass (HB) injury were reported. Field research was conducted from 2012 to 2014 evaluating indaziflam application rates [16 followed by 16 (28 d), 33, 49, or 65 g a.i. ha−1] and timings (fall‐only, fall‐plus‐spring, or spring‐only) in two environments (reduced sunlight [RS] and full sunlight [FS]) to elucidate their effect on HB growth. In Year 1, differences were not detected, while in Year 2 HB cover varied between environments. In Year 2, HB cover in the RS environment treated with 49 and 65 g ha−1 had 36 and 64% less visual cover 12 wk after initial spring treatment than the FS environment, respectively. Within the RS environment, indaziflam also reduced HB visual cover compared to the nontreated (77% cover). A bioassay study conducted with soil cores collected from field plots suggested HB cover reduction was minimally affected by indaziflam‐soil bioavailability, as perennial ryegrass biomass was not reduced beyond a 2.5‐cm depth. Weather conditions varied between years, with air temperatures ≤0°C occurring more frequently and to a greater magnitude in Year 2. The weather, coupled with reduced solar radiation in the RS environment may have contributed to HB cover reduction in Year 2. Overall, indaziflam applications to established HB in areas with suitable growth conditions were safe; however, unacceptable HB cover reductions were observed in areas with poor growth conditions.

Indaziflam is safe on established bermudagrass grown in appropriate conditions.
Bermudagrass‐indaziflam tolerance decreased when applied in a reduced sunlight setting.
Severe winter climatic conditions exacerbated bermudagrass‐indaziflam injury.

}, number={3}, journal={AGRONOMY JOURNAL}, author={Jeffries, Matthew D. and Gannon, Travis W. and Ou, Ling}, year={2016}, pages={950–956} }