Kelsey L.H. Greub
A5046502529- Soil Carbon and Nitrogen Dynamics
- Soil and Water Nutrient Dynamics
- Soil and Unsaturated Flow
- Plant nutrient uptake and metabolism
- Soil Management and Crop Yield
- Clay minerals and soil interactions
- Soil Geostatistics and Mapping
- Invertebrate Taxonomy and Ecology
- Gut microbiota and health
- Pesticide and Herbicide Environmental Studies
- Genomics and Phylogenetic Studies
- Microbial Community Ecology and Physiology
University of Arkansas at Fayetteville
2022
Abstract The North American Project to Evaluate Soil Health Measurements was initiated with the objective identify widely applicable soil health measurements for evaluation of agricultural management practices intended improve health. More than 20 indicators were chosen assessment across 120 long‐term research sites spanning from north‐central Canada southern Mexico. being evaluated include common standard measures soil, but also newer techniques visible and near‐infrared reflectance...
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...
Phospholipid fatty acid analysis (PLFA) provides an easy to use and robust measure of changing soil microbial condition. The method data on both the quantity composition community- critical knowledge because community is important component health. However, it challenging for new researchers know how process data, interpret results, its effectiveness in evaluating health management. We set out address these challenges using North American Project Evaluate Soil Health Measurements PLFA...
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,...
Abstract Cover crops have the potential to decrease residual‐nitrogen (N) losses from agricultural soils by capturing and storing excess N between cash crops. This study was established assess effect of cover crop species rate on accumulation partitioning biomass 15 fertilizer produced under controlled environmental conditions. Cereal rye ( Secale cereale ) tillage radish Raphanus sativus were grown in monoculture a blend greenhouse conditions two soils. Urea enriched with (3.0 atom %)...
Abstract Nitrogen (N) captured by cover crops can be recycled for use the following crop via decomposition and net mineralization. This study assessed magnitude of inorganic‐N released from radish ( Raphanus sativus L.) cereal rye Secale cereale residue. The experiment was designed using a five two factorial treatment structure with residue treatments (radish shoots, roots, whole radish, no crop) levels incorporation (incorporated surface applied). Cover residues were applied to silt loam...
Highlights• Four common indicators of aggregate stability were assessed across North America• Aggregate moderately correlated with each other• All influenced by inherent soil properties and climate• Indicators sensitive to tillage, cover crops, organic amendments, residue• Indicator responses tillage other health