Deirdre Griffin‐LaHue
A5013821109- Methane Hydrates and Related Phenomena
- Geophysics and Gravity Measurements
- Soil Carbon and Nitrogen Dynamics
- Soil and Water Nutrient Dynamics
- Irrigation Practices and Water Management
- Soil and Unsaturated Flow
- Peatlands and Wetlands Ecology
- Plant Pathogens and Resistance
- Seedling growth and survival studies
- Polymer-Based Agricultural Enhancements
- Mycorrhizal Fungi and Plant Interactions
- Plant Disease Management Techniques
- Soil erosion and sediment transport
- Soil Management and Crop Yield
- Clay minerals and soil interactions
- Seed and Plant Biochemistry
- Weed Control and Herbicide Applications
- Botany and Plant Ecology Studies
- Plant-Microbe Interactions and Immunity
- Plant Physiology and Cultivation Studies
- Gut microbiota and health
- Pesticide and Herbicide Environmental Studies
- Plant Surface Properties and Treatments
- Composting and Vermicomposting Techniques
- Agronomic Practices and Intercropping Systems
Washington State University
2020-2024
University of California, Davis
2016-2023
University of Kentucky
2022
University of Maryland, College Park
2012
Soil organic carbon (SOC) is closely tied to soil health. However, additional biological indicators may also provide insight about C dynamics and microbial activity. We used SOC the other (potential mineralization, permanganate oxidizable C, water extractable β-glucosidase enzyme activity) from North American Project Evaluate Health Measurements examine continental-scale drivers of these indicators, relationships among effects health practices on indicator values. All had greater values at...
Aggregate stability is a commonly used indicator of soil health because improvements in aggregate are related to reduced erodibility and improved soil–water dynamics. During the past 80 90 years, numerous methods have been developed assess stability. Limited comparisons among resulted varied magnitudes response management practices influences inherent properties climate. It not clear whether selection specific method creates any advantage investigator. This study assessed four measuring...
Abstract Currently accepted pedotransfer functions show negligible effect of management‐induced changes to soil organic carbon (SOC) on plant available water holding capacity (θ AWHC ), while some studies the ability substantially increase θ through management. The Soil Health Institute's North America Project Evaluate Measurements measured content at field using intact cores across 124 long‐term research sites that contained increases in SOC as a result management treatments such reduced...
Abstract Farmers, scientists, and other soil health stakeholders require interpretable indicators of hydraulic function. Determining which to use has been difficult because measurement disconformity, spatial temporal variability, recently established treatments, the effect site characteristics on management practice differences. The North American Project Evaluate Soil Health Measurements includes 124 sites uniformly sampled across a range practices in America 2019. We compare recommend...
Potential carbon mineralization (Cmin) is a commonly used indicator of soil health, with greater Cmin values interpreted as healthier soil. While are typically in agricultural soils managed minimal physical disturbance, the mechanisms driving increases remain poorly understood. This study assessed bacterial and archaeal community structure potential microbial drivers maintained under various degrees disturbance. mineralization, 16S rRNA sequences, characterization data were collected part...
Abstract Various soil health indicators that measure a chemically defined fraction of nitrogen (N) or process related to N cycling have been proposed quantify the potential supply crops, key function. We evaluated five (total N, autoclavable citrate extractable water‐extractable organic potentially mineralizable and ‐acetyl‐β‐ D ‐glucosaminidase activity) at 124 sites with long‐term experiments across North America evaluating variety managements. found 59%–81% variation in was among sites,...
Root exploitation of soil heterogeneity and microbially-mediated rhizosphere nutrient transformations play critical roles in plant resource uptake. However, how these processes change under water-saving irrigation technologies remains unclear, especially for organic systems where crops rely on ecological nutrition productivity. We conducted a field experiment examined subsurface drip (SDI) concentrated fertilizer application altered root traits compared to traditional furrow (FI) an tomato...
Nitrogen (N) management is a key component to maintaining high productivity of northern highbush blueberry ( Vaccinium corymbosum L.) and nitrogen often supplied by applying ammonium-based fertilizers. It can also be through mineralization soil organic matter (SOM), although the amount released SOM difficult predict not always considered in development implementation N fertility programs. Laboratory field experiments were conducted estimate timing magnitude net from throughout growing...
Abstract Rangelands have the potential to be provisioners of ecosystem services, including livestock products, carbon storage and greenhouse gas regulation, water nutrient cycling, wildlife habitat, biodiversity. Due their vast extent landscape heterogeneity, degree which different ecological components rangelands contribute services can varied. Soils are foundation rangeland health associated services. While many studies examined effect grazing intensity on few looked at broader how...
Introduction Irrigation management dramatically alters soil water availability and distribution could impact microbial communities carbon (C) nitrogen (N) cycling to an even greater degree than observed in rainfed systems. Adoption of subsurface drip irrigation (SDI) California’s Mediterranean agroecosystems provides agronomic benefits but wets only a portion the volume near root zone, leaving rest dry throughout growing season. In contrast, traditional furrow (FI) has periodic wetting...
Soilborne pathogens can devastate crops, causing economic losses for farmers due to reduced yields and expensive management practices. Fumigants fungicides have harmful impacts on the surrounding environment be toxic humans. Therefore, alternative methods of disease are important. The suppressive abilities composts been recognized several decades, significant research has done in order identify substrates with effective suppression. mechanisms suppression mainly biological, but abiotic...
Abstract Application of biosolids can be beneficial for low carbon (C) and erosion‐prone soils the dryland region inland Pacific Northwest (iPNW). Biosolids have been proven to improve wheat yields soil health in iPNW. Although direct agronomic environmental influences with frequent applications extensively studied, research‐based information on persistence long‐term residual or ‘legacy’ effects only rarely reported. Therefore, this study was conducted understand longevity impacts 7 years...
Abstract Cover cropping is a suggested soil conservation practice widely investigated in systems. crops suppress weeds and often are part of an integrated weed management plan that could lead to reduced herbicide use possibly reduce the seedbank. Winter brassica cover popular eastern Washington potato ( Solanum tuberosum L.) production region, but western Washington, seed presents disease issues along with risk cross-pollination, which limits crops. Research for this article was conducted...
Quinoa downy mildew, caused by Peronospora variabilis, is the most devastating disease of quinoa globally. Rapid, sensitive diagnostic methods are needed to detect and quantify this pathogen in seeds plant tissue. A hydrolysis probe-based quantitative real-time PCR (qPCR) assay including a competitive internal control was developed for P. variabilis detection. This could as low 20 ag DNA or approximately 25 transcribed spacer (ITS) copies per reaction with efficiencies ranging from 93.9...