Peter C. Scharf
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View article: Comparative analysis of three next-generation sequencing techniques to measure nosZ gene abundance in Missouri claypan soils
Comparative analysis of three next-generation sequencing techniques to measure nosZ gene abundance in Missouri claypan soils Open
Quantitative next-generation sequencing techniques have been critical in gaining a better understanding of microbial ecosystems. In soils, denitrifying microorganisms are responsible for dinitrogen (N2) production. The nosZ gene codes for …
View article: Spatial variability of denitrification enzyme activity and actual denitrification emissions on Missouri claypan soils
Spatial variability of denitrification enzyme activity and actual denitrification emissions on Missouri claypan soils Open
Denitrification in agricultural soils is responsible for the majority of anthropogenic N 2 O production. The objective of this research was to assess denitrification potential and the spatial dependence of soil N 2 O flux from claypan soil…
View article: Effects of Landscape, Soils, and Weather on Yields, Nitrogen Use, and Profitability with Sensor-Based Variable Rate Nitrogen Management in Cotton
Effects of Landscape, Soils, and Weather on Yields, Nitrogen Use, and Profitability with Sensor-Based Variable Rate Nitrogen Management in Cotton Open
Farmers may be reluctant to adopt variable rate nitrogen (VRN) management because of uncertain profits. This study assessed field landscape, soil, and weather effects on optical sensing (OS)-based VRN on cotton (Gossypium hirsutum L.) N ra…
View article: Combination of biological and chemical soil tests best predict maize nitrogen response
Combination of biological and chemical soil tests best predict maize nitrogen response Open
Soil tests can help optimize nitrogen (N) fertilizer rates, thereby improving farmer profitability and environmental performance. In US Midwest maize ( Zea mays ) production, however, most soil N tests have limited accuracy to predict N fe…
View article: Corn nitrogen rate recommendation tools’ performance across eight US midwest corn belt states
Corn nitrogen rate recommendation tools’ performance across eight US midwest corn belt states Open
Determining which corn ( Zea mays L.) N fertilizer rate recommendation tools best predict crop N need would be valuable for maximizing profits and minimizing environmental consequences. Simultaneous comparisons of multiple tools across var…
View article: Active‐Optical Reflectance Sensing Corn Algorithms Evaluated over the United States Midwest Corn Belt
Active‐Optical Reflectance Sensing Corn Algorithms Evaluated over the United States Midwest Corn Belt Open
Core Ideas Active‐optical reflectance sensor algorithms perform poorly outside the area for which they were originally developed. The red edge waveband is more sensitive to N stress than the red waveband. Some active‐optical reflectance al…
View article: Improving an Active‐Optical Reflectance Sensor Algorithm Using Soil and Weather Information
Improving an Active‐Optical Reflectance Sensor Algorithm Using Soil and Weather Information Open
Core Ideas Canopy sensor performance improved using site‐specific information. Evenness of early‐season rainfall is crucial for adjusting N recommendations. Adjusting N recommendations using measured vs. USDA mapped soil data performed ali…
View article: Strengths and Limitations of Nitrogen Rate Recommendations for Corn and Opportunities for Improvement
Strengths and Limitations of Nitrogen Rate Recommendations for Corn and Opportunities for Improvement Open
Core Ideas Nitrogen recommendations for individual corn fields are less accurate than desired. Nitrogen recommendations need improvement for economic and environmental reasons. A review of fundamental concepts will improve understanding ab…
View article: Effect of Organic Amendment and Cultural Practice on Large Patch Occurrence and Soil Microbial Community
Effect of Organic Amendment and Cultural Practice on Large Patch Occurrence and Soil Microbial Community Open
Organic amendments often stimulate soil microorganisms that result in suppression of soilborne pathogens. However, little information is available about the influences of organic amendments and cultural practices on suppression of Rhizocto…
View article: Active-Optical Reflectance Sensing Evaluated for Red and Red-Edge Waveband Sensitivity
Active-Optical Reflectance Sensing Evaluated for Red and Red-Edge Waveband Sensitivity Open
Uncertainty exists with corn (Zea mays L.) N management due to year-to-year variation in crop N need, soil N supply, and N loss from leaching, volatilization, and denitrification. Active-optical reflectance sensing (AORS) has proven effect…
View article: A Case Study of Environmental Benefits of Sensor-Based Nitrogen Application in Corn
A Case Study of Environmental Benefits of Sensor-Based Nitrogen Application in Corn Open
Crop canopy reflectance sensors make it possible to estimate crop N demand and apply appropriate N fertilizer rates at different locations in a field, reducing fertilizer input and associated environmental impacts while maintaining crop yi…