A5059873802- Soil Carbon and Nitrogen Dynamics
- Soil and Water Nutrient Dynamics
- Wastewater Treatment and Nitrogen Removal
- Metabolism and Genetic Disorders
- Bioenergy crop production and management
- Microbial Community Ecology and Physiology
- Plant and fungal interactions
- Plant Parasitism and Resistance
- Plant and animal studies
- Anaerobic Digestion and Biogas Production
- Seedling growth and survival studies
- Plant nutrient uptake and metabolism
- Crop Yield and Soil Fertility
- Peatlands and Wetlands Ecology
- Turfgrass Adaptation and Management
- Plant Taxonomy and Phylogenetics
- Ruminant Nutrition and Digestive Physiology
- Agroforestry and silvopastoral systems
- Biofuel production and bioconversion
- Forest Biomass Utilization and Management
Arkansas State University
2023-2025
University of Tennessee at Knoxville
2021-2024
Mississippi State University
2018
Abstract Current knowledge of yield potential and best agronomic management practices for perennial bioenergy grasses is primarily derived from small‐scale short‐term studies, yet these studies inform policy at the national scale. In an effort to learn more about how perform across multiple locations years, U.S. Department Energy ( US DOE )/Sun Grant Initiative Regional Feedstock Partnership was initiated in 2008. The objectives were (1) provide a wide range information feedstock selection...
Native C4 grasses have become the preferred species for native perennial pastures and bioenergy production due to their high productivity under low soil nitrogen (N) status. One reason N requirement is that may benefit from diazotrophs promote biological fixation. Our objective was evaluate impact of fertilization rates (0, 67, 202 kg ha-1) grass (switchgrass [Panicum virgatum] big bluestem [Andropogon gerardii]) on abundance, activity, diversity, community composition over three...
The identification of appropriate nitrogen (N) rates for native warm-season grasses (NWSG) is needed to inform forage management in the southeastern United States. Experiments were conducted Knoxville and Springfield, TN, from 2015 2019, evaluate dry matter (DM) yield, nutritive value (FNV), influence temperature precipitation on partial factor productivity (PFP) responses. Three NWSG species (big bluestem [BB; Andropogon gerardii Vitman], switchgrass [SG; Panicum virgatum L.], eastern...
Data are needed to identify optimum response potassium (K) and phosphorus (P) amendment associated mycorrhizal colonization for native warm-season grasses (NWSGs; big bluestem [BB; Andropogon gerardii Vitman] switchgrass [SG; Panicum virgatum L.]). To evaluate these responses, experiments were conducted in Knoxville Springfield, Tennessee, from 2013 2019. In twice-annual harvests, we assessed BB SG dry matter (DM) yield, crude protein (CP), total digestible nutrients (TDNs), P K removed by...
Background Fertilizer addition can contribute to nitrogen (N) losses from soil by affecting microbial populations responsible for nitrification. However, the effects of N fertilization on ammonia oxidizing bacteria under C 4 perennial grasses in nutrient-poor grasslands are not well studied. Methods In this study, a field experiment was used assess rate (0, 67, and 202 kg ha −1 ) grass species (switchgrass ( Panicum virgatum big bluestem Andropogon gerardii )) ammonia-oxidizing bacterial...
Abstract Incorporating native forbs within warm‐season grass (NWSG) pastures has the potential to benefit cattle, pollinators, and wildlife beyond that of NWSG monocultures. However, when grazing pastures, rotational stocking is recommended as opposed continuous stocking. Therefore, evaluate whether within‐season rest needed for pasture sustainability, two experiments were conducted near Greeneville, TN, 2017–2020, assess persistence an 11‐species forb blend was interseeded into established...
Pollinator declines and expectations for more sustainable agriculture, including pasture-based enterprises, bring attention to strategies enhance the habitat value of grazing lands. We evaluated native warm-season grass (NWSG) pastures with (FORB) without (CONT) interseeded forbs in 2021–2023. An analysis was conducted using R significance set at p ≤ 0.05. The appeared be weakened predominantly by management practices. Forb density mass had an inverse relationship seasons two three. Total...
Abstract The lack of forage production during the seedling year is a barrier to wide‐scale adoption native warm‐season grasses (NWSG). To address this, two NWSG establishment experiments were conducted in Knoxville, TN, 2016–2018, determine efficacy big bluestem (BB; Andropogon gerardii Vitman) and switchgrass (SG; Panicum virgatum L.) with browntop millet [BTM; Urochloa ramosa (L.) Nguyen] as companion crop. Each experiment was randomized complete block arranged 2 × 3 factorial. Two...
Insect pollinators are in population decline due to environmental and chemical stressors. Including native forbs pastures could benefit grazers pollinators; however, their forage flowering characteristics not fully documented. The objectives of our research were evaluate 12 for persistence, mass, nutrient composition, patterns under repeated defoliation. Twelve species planted a small-plot experiment 2018. Response variables measured from 2020 2022. Annual (partridge pea, PPEA, Chamaecrista...
Soil microbial transformation of nitrogen (N) in nutrient-limited native C 4 grasslands can be affected by N fertilization rate and grass species. Here, we report situ dynamics the population size (gene copy abundances) activity (transcript five functional genes involved soil cycling ( nifH , bacterial amoA nirK nirS nosZ ) a field experiment with two species (switchgrass Panicum virgatum big bluestem Andropogon gerardii )) under three rates (0, 67, 202 kg ha −1 ). Diazotroph abundance were...