A5000038199- Soil and Water Nutrient Dynamics
- Zoonotic diseases and public health
- Soil Carbon and Nitrogen Dynamics
- Crop Yield and Soil Fertility
- Hydrology and Watershed Management Studies
- Soil Geostatistics and Mapping
- Viral Infections and Outbreaks Research
- Plant and animal studies
- Viral Infections and Vectors
- Ecology and Vegetation Dynamics Studies
- Soil erosion and sediment transport
- COVID-19 epidemiological studies
- Soil and Unsaturated Flow
- Remote Sensing in Agriculture
- Agronomic Practices and Intercropping Systems
- Parasite Biology and Host Interactions
- Legume Nitrogen Fixing Symbiosis
- Rangeland and Wildlife Management
- Phosphorus and nutrient management
- Soybean genetics and cultivation
- Wastewater Treatment and Nitrogen Removal
- Species Distribution and Climate Change
- Irrigation Practices and Water Management
- Plant Micronutrient Interactions and Effects
- Turfgrass Adaptation and Management
University of Georgia
2013-2024
Corteva (United States)
2020
Pioneer Hi-Bred
2012-2019
Southern Research Station
2019
Triangle
2019
Cary Institute of Ecosystem Studies
2017
University of Michigan–Ann Arbor
2009-2017
Agricultural Research Service
2005-2014
Southeast Watershed Research Laboratory
2012-2014
Waters (United States)
2006-2010
Significance Forecasting reservoirs of zoonotic disease is a pressing public health priority. We apply machine learning to datasets describing the biological, ecological, and life history traits rodents, which collectively carry disproportionate number pathogens. identify particular rodent species predicted be novel geographic regions from new emerging pathogens are most likely arise. also describe trait profiles—complexes biological features—that distinguish nonreservoirs. Generally,...
Loss of soil nutrients in runoff accelerates eutrophication surface waters. This study evaluated P and N relation to rainfall intensity hydrology for two soils along a single hillslope. Experiments were initiated on 1- by 2-m plots at foot-slope (6%) mid-slope (30%) positions within an alfalfa (Medicago sativa L.)-orchardgrass (Dactylis glomerata L.) field. Rain simulations (2.9 7.0 cm h(-1)) conducted under wet (spring) dry (late-summer) conditions. Elevated, antecedent moisture the during...
Phosphorus (P) loss from agricultural watersheds is generally greater in storm rather than base flow. Although fundamental to P-based risk assessment tools, few studies have quantified the effect of size on P loss. Thus, as a function flow type (base and flow) was for mixed-land use watershed (FD-36; 39.5 ha) 1997 2006. Storm ranked by return period (<1, 1-3, 3-5, 5-10, >10 yr), where increasing represents storms with peak total From 2006, accounted 32% discharge yet contributed 65%...
Abstract Anticipated increases in precipitation intensity due to climate change may affect hydrological controls on soil N 2 O fluxes, resulting a feedback between and greenhouse gas emissions. We evaluated hydrologic emissions during experimental water table fluctuations large, intact columns amended with 100 kg ha −1 KNO 3 ‐N. Soil were collected from three landscape positions that vary biogeochemical properties ( = 12 columns). flooded bottom surface simulate are typical for this site,...
Quantitative relationships between soil structure, especially macropore characteristics, and hydraulic properties are essential to improving our ability predict flow transport in structured soils. The objectives of this study were quantitatively relate characteristics saturated conductivity ( K sat ) dispersivity (λ) identify major useful for estimating under condition. Large intact columns taken from two land uses (cropland pasture) the same type (a Typic Hapludalf), with four replicates...
Illuminating the ecological and evolutionary dynamics of parasites is one most pressing issues facing modern science, critical for basic global economy, human health. Extremely important to this effort are data on disease-causing organisms wild animal hosts (including viruses, bacteria, protozoa, helminths, arthropods, fungi). Here we present an updated version Global Mammal Parasite Database, a database ungulates (artiodactyls perissodactyls), carnivores, primates, make it available...
Ebola and other filoviruses pose significant public health conservation threats by causing high mortality in primates, including humans. Preventing future outbreaks of ebolavirus depends on identifying wildlife reservoirs, but extraordinarily biodiversity potential hosts temporally dynamic environments equatorial Africa contributes to sporadic, unpredictable that have hampered efforts identify wild reservoirs for nearly 40 years. Using a machine learning algorithm, generalized boosted...
Core Ideas Soybean seed yield response to plant density is dependent on environment. Low environments required higher densities than high environments. Plant mainly affected per‐plant number. No differences in survival were observed among Inconsistent soybean [ Glycine max (L.) Merr.] has been previously reported. Moreover, recent economic and productive circumstances have caused interest within‐field variation of the agronomic optimal (AOPD) for soybean. Thus, objectives this study to: (i)...
Efficient use of N fertilizer for corn ( Zea mays L.) production is important maximizing economic return and minimizing NO 3 leaching to groundwater. The objective this study was evaluate grain yield response irrigation rate timing irrigated in the sandy soils along major Kansas waterways. Nitrogen treatments included 300 250 kg ha −1 applied at planting; planting (one‐half) sidedress (one‐half); 185 (one‐third) (two‐thirds); 125 (one‐fifth) (two‐fifths, two‐fifths); 0 . were duplicated one...
The distribution of parasites across mammalian hosts is complex and represents a differential ability or opportunity to infect different host species. Here, we take macroecological approach investigate factors influencing why some show tendency species widely distributed in the phylogeny (phylogenetic generalism) while others only closely related hosts. Using database on over 1400 parasite that have been documented up 69 terrestrial mammal species, characterize phylogenetic generalism using...
Zoonotic disease outbreaks are an important threat to human health and numerous drivers have been recognized as contributing their increasing frequency. Identifying quantifying relationships between of zoonotic outbreak severity is critical developing targeted surveillance prevention strategies. However, quantitative studies on a global scale lacking. Attributes countries such press freedom, capabilities latitude also bias data. To illustrate these issues, we review the characteristics 100...
Rivers and streams contribute to global carbon cycling by decomposing immense quantities of terrestrial plant matter. However, decomposition rates are highly variable large-scale patterns drivers this process remain poorly understood. Using a cellulose-based assay reflect the primary constituent detritus, we generated predictive model (81% variance explained) for cellulose across 514 globally distributed streams. A large number variables were important predicting decomposition, highlighting...
Abstract Excluding fertilizer P, a finite quantity of soil P exists for plant uptake. To improve our understanding sinks and sources long‐term plant‐available fractions to depth 30 cm were determined in soils under continuous cropping system prior fertilization (1975), after 10 yr (1985), 6 the last (1992). Soil types two study sites Norfolk loamy sand (fine‐loamy, siliceous, thermic Typic Kandiudult) Davidson clay loam (clayey, kaolinitic, Rhodic Paleudult). Superphosphate was applied from...
Improving N management for corn ( Zea mays L.) production with precision agriculture technologies requires that spatial recommendations adequately represent in‐field variability in availability. Our objective was to evaluate response increasing rates several locations represented the range of soil organic matter (OM) content field. In a 2‐yr study, three center pivot–irrigated fields were selected south‐central Kansas and Nebraska. Four or five within each At location, six treatments (0–336...
Producers often overapply N fertilizer to corn ( Zea mays L.) because of the uncertainty in predicting economic optimum nitrogen rate (EONR). Remote sensing represents a potential opportunity reduce this with an in‐season assessment crop status. This study examines relationship between EONR and reflectance from ground‐based sensor, considers its for developing sidedress recommendations corn. Four fields unique cropping histories were planted during each 2 yr. Three preplant whole plot...
Journal Article Attraction of Neoaplectana carpocapsae (Nematoda: Steinernematidae) to Common Excretory Products Insects Get access J. Schmidt, Schmidt Department Entomology, University Georgia, Athens 30602 Search for other works by this author on: Oxford Academic PubMed Google Scholar N. All Environmental Volume 8, Issue 1, 1 February 1979, Pages 55–61, https://doi.org/10.1093/ee/8.1.55 Published: 01 1979 history Received: 23 June 1978
Low-disturbance manure application methods can provide the benefits of incorporation, including reducing ammonia (NH3) emissions, in production systems where tillage is not possible. However, incorporation exacerbate nitrate (NO3−) leaching. We sought to assess trade-offs NH3 and NO3− losses caused by alternative methods. Dairy slurry (2006–2007) liquid swine (2008–2009) were applied no-till corn (i) shallow (<10 cm) disk injection, (ii) surface banding with soil aeration, (iii)...
Because the natural reservoir of Ebola virus remains unclear and disease outbreaks in humans have occurred only sporadically over a large region, forecasting when where spillovers are most likely to occur constitutes continuing urgent public health challenge. We developed statistical modeling approach that associates 37 human or great ape since 1982 with spatiotemporally dynamic covariates including vegetative cover, population size, absolute relative rainfall 3 decades across sub-Saharan...
Our understanding of ecological processes is built on patterns inferred from data. Applying modern analytical tools such as machine learning to increasingly high dimensional data offers the potential expand our perspectives these processes, shedding new light complex phenomena pathogen transmission in wild populations. Here, we propose a novel approach that combines mining with theoretical models disease dynamics. Using rodents an example, incorporate statistical differences life history...
Abstract Global climate change is predicted to cause range shifts in the mosquito species that transmit pathogens humans and wildlife. Recent modeling studies have sought improve our understanding of relationship between temperature transmission potential mosquito‐borne pathogens. However, role vertebrate host population, including importance behavioral defenses on feeding success, remains poorly understood despite ample empirical evidence its significance pathogen transmission. Here, we...
With the increasing cost of fertilizer N, there is a renewed emphasis on developing new technologies for quantifying in‐season N requirements corn ( Zea mays L.). The objectives this research are (i) to evaluate different vegetative indices derived from an active reflectance sensor in estimating corn, and (ii) consider influence N:Corn price ratio economic optimum nitrogen rate (EONR) developed using these indices. Field experiments were conducted at eight site‐years central Pennsylvania. A...
Precision agriculture technologies provide the capability to spatially vary N fertilizer applied corn ( Zea mays L.), potentially improving use efficiency. The focus of this study was evaluate potential recommendations based on crop canopy reflectance. Corn grown at four field sites in each 2 yr Centre County, Pennsylvania. Preplant treatments included: zero fertilizer, 56 kg ha −1 , and manure. Split‐plot included following sidedress rates as NH 4 NO 3 : 0, 22, 45, 90, 135, 180, 280 one...