A5076317676- Seedling growth and survival studies
- Composting and Vermicomposting Techniques
- Irrigation Practices and Water Management
- Growth and nutrition in plants
- Soil and Unsaturated Flow
- Soil and Water Nutrient Dynamics
- Wastewater Treatment and Reuse
- Constructed Wetlands for Wastewater Treatment
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Urban Stormwater Management Solutions
- Phosphorus and nutrient management
- Tree Root and Stability Studies
- Smart Agriculture and AI
- Plant Physiology and Cultivation Studies
- Pesticide and Herbicide Environmental Studies
- Plant Water Relations and Carbon Dynamics
- Remote Sensing in Agriculture
- Plant nutrient uptake and metabolism
- Crystallography and molecular interactions
- Remote Sensing and LiDAR Applications
- Urban Heat Island Mitigation
- Forest ecology and management
- Turfgrass Adaptation and Management
- Soil Moisture and Remote Sensing
United States Department of Agriculture
1997-2025
Agricultural Research Service
2008-2025
United States Department of State
2024
Oregon State University
2007-2023
University of Florida
2023
University of Tennessee at Knoxville
2023
Norfolk State University
2023
Texas A&M University
2023
Virginia Tech
2013-2021
Virginia Cooperative Extension
2013-2019
Water stress is a critical factor affecting the health and productivity of ornamental plants, yet early detection remains challenging. This study aims to investigate spectral responses four plant taxa—Rosa hybrid (rose), Itea virginica (itea), Spiraea nipponica (spirea), Weigela florida (weigela)—under varying levels water using hyperspectral imaging principal component analysis (PCA). Hyperspectral data were collected across multiple wavelengths PCA was applied identify key bands associated...
Many research studies have evaluated potential organic and mineral container substrate components for use in commercial potting substrates. Most report results of plant growth over a single production season only few include physical properties the substrates tested. Furthermore, containing predominantly decompose during crop cycles producing changes air water ratios. In nursery industry, crops frequently remain containers longer periods than one growing (18 to 24 months). Changes retention...
Nursery and greenhouse producers, research extension faculty, representatives from allied fields collaborated to formulate a renewed vision address water issues affecting growers over the next 10 years. The authors maintained original container irrigation perspective published in “Strategic of nursery ten years,” yet broadened include additional challenges that face crop producers today future. Water availability, quality, related continue garner widespread attention. Irrigation practices...
Abstract Background and aims Containerized soilless substrates are highly porous to ensure adequate air storage overcome the “container” effect- lower part of container nears saturation which can decrease root health growth. Substrate porosity is dynamic, evolving over time. As roots fill pores, substrate decomposition in-situ particle movement change physical structure, shifting its properties performance. Research sparse in understanding how developing their morphology throughout...
This study compares the performance of three bioretention media blends for N and P removal from simulated urban runoff in experimental mesocosms. TerraSolve, Biofilter, "VT Mix" (Virginia Tech) were compared with without vegetation at varying hydraulic residence times (HRTs). Adsorption isotherm experiments also conducted. TerraSolve VT Mix included water treatment residuals (WTRs), Biofilter yard-waste compost (YWC), a mix coir peat. removed highest amount total (>95%), which is attributed...
The objectives of this study were to determine the effects irrigation method on movement 10 commonly used pesticides in container nursery production. Pesticide transport under three methods at a engineered collect return flow (IRF) from production surface and subsurface was determined. applications occurred times throughout study, followed by 16-day monitoring period. applied IRF volumes generated single events measured subsamples water analyzed assess pesticide presence. Overhead served as...
Pine tree substrates (PTSs) may provide growers with sustainable substrate component options. Improved processing of PTS components has provided new materials little scientific evaluation or understanding their hydrophysical behavior and properties. Moisture retention characteristics were developed for two PTSs four traditional greenhouse components: sphagnum peat, coconut coir, perlite, pine bark, shredded-pine-wood (SPW), pine-wood-chips (PWC). Mixtures peat containing 10%, 20%, 30%, 40%,...
As demand for freshwater increases while supply remains stagnant, the critical need sustainable water use in agriculture has led EPA Strategic Plan to call new technologies that can optimize allocation real-time. This work assesses of cloud-based artificial intelligence detect early indicators stress across six container-grown ornamental shrub species. Near-infrared images were previously collected with modified Canon and MAPIR Survey II cameras deployed via a small unmanned aircraft system...
Growers rely on soilless substrates to provide sufficient water and nutrients containerized crops. Traditional bark-based are engineered have relatively low water-holding capabilities, which can lead nonuniform rewetting patterns inefficient usage of resources. Engineering redistribute dynamics maximize aeration within the container may improve resource efficiencies. The goal this study was evaluate whether more efficient irrigation schedules be used when stratifying unique a for added crop...
The Willamette Valley of Oregon has extensive areas poorly drained, commercial grass seed lands. Little is know about the ability riparian in these settings to reduce nitrate water draining from fields. We established two study sites with similar soils and hydrology but contrasting vegetation along an intermittent stream that drains perennial ryegrass (Lolium perenne L.) fields western Oregon. installed a series nested piezometers three transects at each site examine NO3-N shallow ground...
A study was conducted to quantify the effect of substrate texture on water-holding capacity douglas fir [ Pseudotsuga menziesii (Mirb.) Franco] bark (DFB) in containers varying height. Medium (less than 2.2 cm) and fine 0.9 DFB were packed into 7.6 cm i.d. aluminum cores 3.8, 7.6, 15.2 tall determine container (CC) air space (AS) at heights. Increasing height resulted a linear decrease CC increase AS. Fine bulk density (D b ) increased 18% with increasing height, whereas D medium unaffected....
Production of containerized nursery crops requires high inputs water and mineral nutrients to maximize plant growth produce a salable quickly. However, input efficiencies remain below 50% resulting in major quantities leached. This study was conducted determine if production factors could be altered increase phosphorus uptake efficiency (PUE) without sacrificing growth. The effects pine bark substrate amendment (clay or sand) reduction both P application rate (1.0 g 0.5 g) leaching fraction...
Urbanization increases runoff, sediment, and nutrient loadings downstream, causing flooding, eutrophication, harmful algal blooms. Stormwater control measures (SCMs) are used to address these concerns designed based on inflow loads. Thus, estimating sediment loads is important for meeting restoration objectives. Pollutants accumulate surfaces during dry periods, making Event Mean Concentration (EMC) a function of antecedent period (ADP). An EMC results from wash-off accumulated pollutants...
A comprehensive literature search of industrial and agricultural by-products to replace or extend existing soilless substrate components would produce a seemingly endless list materials from “garbage” plethora manure-based composts that have been tested both in the laboratory crop response studies throughout world. Many these alternatives shown promise, but limiting factors for integration use continue include: regional national availability; transport costs; handling lack uniform consistent...
Pine bark is the primary constituent of nursery container media (i.e., soilless substrate) in eastern United States. physical and hydraulic properties vary depending on supplier due to source (e.g., lumber mill type) or methods additional processing aging. can be processed via hammer milling grinding before after being aged from ≤1 month (fresh) ≥6 (aged). Additionally, commonly amended with sand alter increase bulk density (D b ). Information limited differences between varying sources...
Water-efficient soilless substrates need to be engineered address diminishing water resources. Therefore, we investigated with varying hydrologies determine their influence on crop growth and plant status. Aged loblolly pine ( Pinus taeda ) bark was graded into four particle size fractions. The coarsest fraction also blended either sphagnum peat or coir at rates that mimic static physical properties of the unfractionated conventional substrate used by specialty producers within eastern...