A5020582097- Crop Yield and Soil Fertility
- Wheat and Barley Genetics and Pathology
- Soil Carbon and Nitrogen Dynamics
- Soil and Water Nutrient Dynamics
- Genetics and Plant Breeding
- Agronomic Practices and Intercropping Systems
- Remote Sensing in Agriculture
- Plant nutrient uptake and metabolism
- Bioenergy crop production and management
- Agricultural Economics and Policy
- Food composition and properties
- Legume Nitrogen Fixing Symbiosis
- Turfgrass Adaptation and Management
- Agricultural Productivity and Crop Improvement
- Soil Mechanics and Vehicle Dynamics
- Rice Cultivation and Yield Improvement
- Plant Disease Resistance and Genetics
- Phosphorus and nutrient management
- Sugarcane Cultivation and Processing
- Ruminant Nutrition and Digestive Physiology
- Soil Management and Crop Yield
- Plant Growth Enhancement Techniques
- Agriculture and Rural Development Research
- Genetic Mapping and Diversity in Plants and Animals
- Mycotoxins in Agriculture and Food
Virginia Tech
2015-2025
Oklahoma State University
1998-2025
Plant (United States)
2025
Virginia Cooperative Extension
2023
The Nature Conservancy
2022
Noble Research Institute
2002-2005
In 2001, N fertilizer prices nearly doubled as a result of increased natural gas prices. This was further troubling when considering that the world use efficiency (NUE) in cereal grain production averages only 33%. Methods to improve NUE winter wheat ( Triticum aestivum L.) have not included high spatial‐resolution management based on sensed plant growth properties nor midseason prediction yield. Our objective determine validity using in‐season estimates yield (INSEY) and response index (RI)...
Nitrogen fertilization rates in cereal production systems are generally determined by subtracting soil test N from a specified requirement based on the grain yield goal, which represents best achievable last 4 to 5 yr. If could be predicted season, topdress adjusted projected removal. Our study was conducted determine if potential of winter wheat ( Triticum aestivum L.) using in‐season spectral measurements collected between January and March. The normalized difference vegetation index...
Soil properties and weather conditions are known to affect soil N availability plant uptake; however, studies examining response as affected by sometimes give conflicting results. Meta‐analysis is a statistical method for estimating treatment effects in series of experiments explain the sources heterogeneity. In this study, technique was used examine influence parameters on corn ( Zea mays L.) across 51 involving same rate treatments that were performed diversity North American locations...
Core Ideas Despite nationwide emphasis on soil health in the USA, current measurements lack consistency. A meta‐analysis showed 8 of 42 indicators reported >20% time. Only 13 short‐term (1–3 yr timescale) responses to cover cropping. Wide variation sampling protocols suggests standardization is needed. Translating research across systems requires a common framework. improving United States, measurement have little To survey assessment practices, we conducted crop ( n = 86) and no‐tillage...
Abstract Current methods of determining nitrogen (N) fertilization rates in winter wheat (Triticum aestivum L.) are based on farmer projected yield goals and fixed N removal per unit grain produced. This work reports an alternative method fertilizer using estimates early-season plant uptake potential determined from in-season spectral measurements collected between January April. Reflectance under daytime lighting the red near infrared regions spectra were used to compute normalized...
In 2001, N fertilizer prices nearly doubled as a result of increased natural gas prices. This was further troubling when considering that the world use efficiency (NUE) in cereal grain production averages only 33%. Methods to improve NUE winter wheat (Triticum aestivum L.) have not included high spatial-resolution management based on sensed plant growth properties nor midseason prediction yield. Our objective determine validity using in-season estimates yield (INSEY) and response index (RI)...
Abstract Switchgrass (Panicum virgatum L.) is currently being evaluated as a raw material for producing fuel, chemicals, and electricity. biomass bound by the growing environment that includes fertility. More information needed on sustainable switchgrass production influenced nitrogen fertility harvest management. Field experiments were initiated at Chickasha Perkins, OK in 1996 1998, respectively to evaluate response applied (N) rates of 0, 112, 224, 448, 896 kg ha−1. In addition, frequency...
Increasing grain protein in new higher‐yielding cereal grains has recently received added attention due to premiums paid farmers. Hard red winter wheat ( Triticum aestivum L.) studies were conducted at two locations Oklahoma 1997–1998, 1998–1999, and 1999–2000 evaluate the effects of late‐season foliar N applications on yield, total N, straw N. Foliar made different times (pre‐ postflowering) using urea ammonium nitrate (UAN) rates 0, 11, 22, 34, 45 kg ha −1 . Ammonium sulfate [(NH 4 ) 2 SO...
Cover crops are a major focus of conservation agriculture efforts because they can provide soil cover and increase nutrient availability after their mineralization in cropping systems. To evaluate the effect residue type placement on rate decomposition carbon (C) nitrogen (N) mineralization, residues from two food crops, maize (Zea mays L.) common bean (Phaseolus vulgaris L.), promising sunn hemp (Crotalaria juncea sorghum sudangrass (Sorghum bicolor [L.] Moench x S. var. Sudanese [Piper]...
Cereal leaf beetle, Oulema melanopus L., is an introduced insect pest of small grains first recorded in the United States early 1960s. Since its introduction from Europe or Asia into Michigan, cereal beetle has rapidly spread and can now be found most states. feeds on numerous species grasses considered a major oats, barley, wheat. Although several studies have investigated biology population dynamics, gaps remain understanding mechanisms that influence distribution, which makes predicting...
ABSTRACT Periodic evaluation of breeding progress is necessary to assess genetic gains over time, and underlying traits responsible for yield can direct future breeding. This study was conducted determine the rate magnitude in eastern soft red winter (SRW) wheat ( Triticum aestivum L.) cultivars released from 1950 2009 relative a historical cultivar Red May (1919). The effects agronomic, morphological, component on grain were studied 50 widely grown historic current replicated trials at...
Abstract Southern Leaf Blight (SLB), Northern (NLB), and Gray Spot (GLS) caused by Cochliobolus heterostrophus, Setosphaeria turcica, Cercospora zeae-maydis respectively, are among the most important diseases of corn worldwide. Previously, moderately high significantly positive genetic correlations between resistance levels to each these were identified in a panel 253 diverse maize inbred lines. The goal this study was identify loci underlying disease some multiple resistant (MDR) lines...
Our national data and infrastructure security issues affecting the "bioeconomy" are evolving rapidly. Simultaneously, conversation about cyber of U.S. food agricultural system (cyber biosecurity) is incomplete disjointed. The production sectors influence over 20% nation's economy ($6.7T) 15% employment (43.3M jobs). immensely diverse they require advanced technologies efficiencies that rely on computer technologies, big data, cloud-based storage, internet accessibility. There a critical need...
Abstract Leaf area index (LAI) is the ratio of total one-sided leaf to ground area, whereas lateral growth (LG) measure canopy expansion. They are indicators for light capture, plant growth, and yield. Although LAI LG can be directly measured, this time consuming. Healthy leaves absorb in blue red, reflect green regions electromagnetic spectrum. Aerial high-throughput phenotyping (HTP) may enable rapid acquisition from reflectance these regions. In paper, we report novel models estimate...
Abstract In this study we characterized a panel of 1,264 maize near-isogenic lines (NILs), developed from crosses between 18 diverse inbred and the recurrent parent B73, referred to as nested NILs (nNILs). 884 nNILs were genotyped using genotyping-by-sequencing (GBS). Subsequently, 24 these nNILs, all parental lines, re-genotyped high-density SNP chip. A novel pipeline for calling introgressions, which does not rely on knowing donor each nNIL, was based hidden Markov model (HMM) algorithm....
We hypothesized that, relative to harvesting small grain grasses at the soft-dough stage (SDS) of maturity, boot (BS) maturity would result in cheaper dairy rations when commodities' prices are high but not low. Small plots grains were planted during fall 2020 and 2021 Blacksburg, Blackstone, Orange, Virginia. In each year location, 2 varieties barley, rye, 4 triticale replicated 6 times, yielding 288 plots. Within we harvested half BS other SDS maturity. For grasses, formulated 8 according...
Core Ideas Limited data on the effect of row width defoliation in modern hybrids. Yield loss 38 cm was less for all treatments vs. 76‐cm rows. Different hybrids responded differently to at different widths. Defoliations had greater impact kernel number than weight both Some defoliations during effective grain‐filling period reduced number. Corn ( Zea mays L.) experiments have been conducted more 130 yr United States. However, there are limited A 2‐yr experiment Lexington, KY, with two (113...