Kelly A. Nelson
A5072806219- Soil Carbon and Nitrogen Dynamics
- Soil and Water Nutrient Dynamics
- Crop Yield and Soil Fertility
- Weed Control and Herbicide Applications
- Soybean genetics and cultivation
- Agronomic Practices and Intercropping Systems
- Plant nutrient uptake and metabolism
- Rice Cultivation and Yield Improvement
- Pesticide and Herbicide Environmental Studies
- Legume Nitrogen Fixing Symbiosis
- Soil Management and Crop Yield
- Hydrology and Watershed Management Studies
- Soil erosion and sediment transport
- Polymer-Based Agricultural Enhancements
- Agroforestry and silvopastoral systems
- Plant responses to water stress
- Soil and Unsaturated Flow
- Bioenergy crop production and management
- Agriculture, Soil, Plant Science
- Plant Micronutrient Interactions and Effects
- Agricultural Science and Fertilization
- Irrigation Practices and Water Management
- Turfgrass Adaptation and Management
- Seedling growth and survival studies
- Plant Disease Management Techniques
University of Missouri
2015-2024
The University of Texas MD Anderson Cancer Center
2019-2024
Plant (United States)
2021-2024
Agricultural Research Service
2023
Utah State University
2022
Dale Bumpers Small Farms Research Center
2022
Oregon State University
2022
Iowa State University
2022
Center for Agricultural Resources Research
2022
American Academy of Dermatology
2022
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...
Improvement of N fertilizer recovery efficiency (NRE) is necessary to reduce excess entering the environment and increase economic returns. A 2‐yr field trial was established in 2005 Northeast Missouri determine effects conventional slow‐release sources landscape position (summit, sideslope, low‐lying) on crop growth NRE corn ( Zea mays L.) a claypan soil. Nitrogen treatments at 168 kg ha −1 consisted pre‐plant applied incorporated polymer‐coated urea (PCU), urea, 50% PCU/50% mix by weight,...
Core Ideas Excessive soil moisture resulting from extreme precipitation events during early spring can often cause decreases in corn grain yields the midwestern United States. Each day of waterlogging resulted an average yield loss 0.42 Mg ha −1 and 0.72 2013 2014, respectively. Pre‐plant N fertilizer applications non‐coated urea; polymer coated urea, urea+nitrification inhibitor 19% higher compared to non‐treated control 2014. Effects rescue were seen on soybean succeeding year after corn,...
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...
Slow‐release N fertilizers, such as polymer‐coated urea (PCU), may increase crop use and reduce NO 3 –N leaching. Research was conducted to evaluate concentrations of soil water samples in noncoated (NCU) PCU treated plots under different management systems, determine differences yields utilization among systems. Water treatments included: no irrigation or drainage (NIN), with subsurface drain tiles 6.1 m apart (NID), subirrigation (SUB), overhead (OND), which were split into...
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,...
Poorly drained soils can potentially have large amounts of applied fertilizer N lost through denitrification which be a major contributor to soil nitrous oxide (N 2 O) emissions. These O emissions due agricultural practices are significant because they contribute global warming and ozone depletion. The objectives this research were quantify the effects tillage/fertilizer placement (i.e., no‐till/surface broadcast strip‐till/deep banded) source [i.e., non‐coated urea (NCU), polymer‐coated...
Controlled drainage (CD), sometimes called water management, is a practice whereby the system outflow managed during specific periods to retain more in field. Although CD has been shown reduce downstream nitrate-N (NO3--N) load, seasonal patterns have less consistent which can potentially impact effectiveness of conservation practices. The main objective this study was assess regional and conventional free (FD) on flow load. Using experimental data from ongoing historical experiments across...
Long-term tillage and crop management studies are useful for determining production practices that conducive to securing sustainable yields profits. The overall goal of this study was evaluate the effects 17-year, long-term rotations involving cotton, corn, soybean on yield profitability. established in 2004 at Delta Research Extension Center, Stoneville, Mississippi with six rotations. were continuous cotton (CT), corn-cotton (CR-CT), corn-cotton-cotton (CR-CT-CT), corn-soybean (CR-SB),...
Cover crops (CC) can improve phosphorus (P) cycling by reducing water related P losses and contributing to nutrition of a rotational crop. This is particularly important in claypan soils with freeze-thaw cycles early spring the Midwest U.S. 4-year study (2019–2022) examined impact CC monoculture mix species on from fertilizer application, determined balance soil compared no cover crop (noCC). The consisted wheat (Triticum aestivum L.), radish (Raphanus raphanistrum subsp. Sativus), turnip...
The Affymetrix Drug Metabolism Enzymes and Transporters (DMET) microarray is the first assay to offer a large representation of SNPs conferring genetic diversity across known pharmacokinetic markers. As convenient painless alternative blood, saliva samples have been reported work well for genotyping on high density SNP arrays, but no reports date examined this application saliva-derived DNA DMET platform. Genomic extractions from produced an ample quantity genomic however when human...
Corn ( Zea mays L.) response to boron (B) on fine textured soils has had limited research, and no research evaluated interactions between B crop protection chemicals such as pyraclostrobin. This effects of foliar‐applied at 0.56 kg ha −1 pyraclostrobin {carbamic acid, [2,[[[1‐(4‐chlorophenyl)‐1H‐pyrazol‐3‐yl]oxy]methyl]phenyl]methoxy‐, methyl ester} 0.11 a.i. yield, tissue concentration, severity disease, grain quality. Field was conducted four locations in Northeast Missouri from 2008 2010....
Field experiments were conducted in 1996 and 1997 at East Lansing, MI, to evaluate weed management programs soybean [Glycine max (L.) Merr.] planted 30 in. 7.5 rows. Efficacy of glyphosate applied alone, with ammonium sulfate (AMS), flumiclorac, or imazethapyr was compared preemergence postemergence used nontransgenic soybean. Glyphosate provided consistent control wide- narrow-row both years. Common ragweed (Ambrosia artemisiifolia L.) velvetleaf (Abutilon theophrasti Medicus) decreased...
Identification and development of sustainable land management is urgently required because widespread resource degradation from poor use practices. In addition, the world will need to increase food production meet nutritional needs a growing global population without major environmental degradation. Ongoing climate change its impacts on environment an additional factor consider in identifying developing The objectives this paper are to: (1) provide background for management, (2) identify...
Identification of corn hybrids that can withstand wet soil conditions is one approach to prevent crop production losses from abiotic stress caused by excessive moisture during early spring season in the midwestern United States. A greenhouse pot experiment was conducted 2013 screen and identify tolerant or susceptible waterlogging at V2 growth stage. The main plots included durations: no waterlogging; 14-day then allowing recovery for 7 days; 21-day waterlogging. Subplots eight commercial...