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Biology and Herbicide Resistance Dynamics of Annual Bluegrass (Poa annua L.) in Turfgrass Systems
No full textAnnual bluegrass (Poa annua L.) is one of the most common and pervasive weeds in turfgrass systems across the United States. It causes severe economic and aesthetic damage in managed turfgrass systems and is the most herbicide-resistant weed in the world. Multiple studies were conducted between the Fall of 2020 and the Spring of 2023, including a preemergence herbicide dose-response assay, a seedbank persistence study, and a common garden study, to elucidate the many phenotypic and adaptive traits of annual bluegrass. Two annual bluegrass populations were confirmed to exhibit resistance to 32X prodiamine (1X=735.6 g ai ha�����) and 16X pronamide (1X=1155.9 g ai ha�����) and observed to survive a 1X field rate of indaziflam (1X=54.5 g ai ha�����). The populations evaluated in the seedbank persistence experiment were buried at two depths [surface (0 cm) and 5 cm] in seven locations. Generally, seed on the soil surface did not persist as long as the seed buried at the 5-cm depth. Annual bluegrass exhibited a short-lived seedbank, with a ���95% reduction in seed viability within two years of burial in the majority of the populations. To evaluate 15 morphological and reproductive traits, seven common gardens were established across a geographical gradient (USDA Plant Hardiness Zones 5b���8b) in the fall of 2020 and harvested in the spring of 2021. The annual bluegrass populations exhibited a wide range of inter- and intra-population diversity for the evaluated traits. In a principal component analysis involving these 15 variables, the first two components explained 63% of the total variation. A cluster analysis grouped these populations according to their origin: warm-season, cool-season, or transition zone. There were strong positive correlations between some traits; specifically, flag leaf length was positively (P=���0.05) associated with seed count plant�����, and plant height was positively (P=���0.01) associated with seed shattering. These findings indicate that annual bluegrass is an extremely diverse plant that can adapt to nearly any environment. Implementation of diverse management tactics that involve chemical and non-chemical tools, especially in a site-specific manner, is expected to thwart adaptation and offer a sustainable approach to the long-term management of this species
Towards Robust Text Embeddings for Legal Informatics
Get PDFRhetorical strategy, as employed by lawyers and judges, has been the subject of research in both the computational and legal theoretic domains. In searching for inexpensive procedures for few-shot inference in a typical legal informatics problem, classification experiments were done on a challenging multi-label dataset of court brief excerpts associated with categorical persuasive intents. Sentence encoders, self-supervised linguistic features, and multi-label classification algorithms were evaluated for their predictive and explanatory power on the corpus. Experimental results showed augmenting transfer learning with features encoding symbolic and structural knowledge outperformed costly approaches, corroborating recent research where it was found that resource-intensive domain adaptation may not offer significant performance gains on downstream legal informatics tasks. Future work will consider different strategies for unifying structural and symbolic features with transfer learning, and determine which tasks and environments they are of most utility
Fueling the mind, feeding the world: Decision making ��� Realizing effects of decisions (DM03)
Get PDFFall 2024 version. Created at Texas A&M University as part of a grant sponsored by the USDA.
For additional information, visit the Texas A&M University Science Communications Lab at https://scicomm.tamu.edu/.This packet contains instructional materials and online modules prepared for Fueling the mind, feeding the world: Decision making ��� Realizing effects of decisions (DM03). It includes curriculum, PowerPoint slides, activities, handouts, grading considerations, and notes for instructors. These materials were created as part of the USDA Grant entitled "Fueling the Mind, Feeding the World: Enhancing Communication and Decision-Making Skills of Secondary Agricultural Education Students."
MODULE OVERVIEW: Every decision made or left unmade can affect one���s future path. Although predicting the future with 100% accuracy is a skill known only in fiction, one can learn to think through what positive and negative effects decisions may have. This module will focus on processes and skills students can use to realize the effects their decisions may have on themselves and others.Secondary Education, Two-Year Postsecondary Education, and Agriculture in the K-12 Classroom (SPECA) Challenge Grants Program no. 2019-38414-30265 and Hatch Project No. TEX09825 from the USDA National Institute of Food and Agriculture
[Travel to India]
No full text67 slide Powerpoint Presentation of Sammy and Chalrotte Ray's travel to India in 1984. The attended the Workshop on Marine toxins in bivalve mollusks and general consideration of shellfish santitation from May 3-5, 1984. Also includes travel photos of shrines and temples, and mariculture
Eastern oyster: a common estuarine invertebrate that sparked the birth of Texas A&M's Oceanography Department
No full text8 slide powerpoint presentation on origin of Texas A&M University's Oceanography Department, and the marine research laboratory at what became Texas A&M University at Galveston