Education

Research Description

Machine Systems and Precision Engineering

Honors and Awards

• CALS Outstanding Teaching Award, 2016
• North American Colleges and Teachers of Agriculture Teaching Fellow Award, 2009
• University Teaching Award, 2005

Publications

View publications on Google Scholar

Grants

Improving Peanut Production and Pest Management Recommendations through Applied Research

National Peanut Board(1/01/22 - 6/30/23)

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Improving Peanut Production and Pest Management Recommendations through Applied Research

Sponsor: National Peanut Board

Start Date: 1/01/22

End Date: 6/30/23

Abstract

The purpose of this project is to develop recommendations for peanut growers relative to the decisions they will make on variety selection, fertilizer applications, regulation of plant growth, and harvesting. This project will also help growers improve pest management by developing new strategies and refinement of currently accepted integrated pest management (IPM) strategies. Controlling Palmer amaranth and other problematic weeds in peanut is important to obtain optimum yields and this project will include herbicide evaluations and their interaction with cultural practices. Knowing the impact of cropping systems on peanut yield and economic return in the entire production system will help growers make informed decisions on crop mixes given fluctuations in crop prices. This project will define important interactions so that growers will know how to manage pests in peanuts given their previous rotation strategies. Determining when to dig peanut is one of the most important decisions a peanut grower will make during the season. With expansion in peanut production across North Carolina and presence of Cooperative Extension agents and other people in agribusiness with limited experience with peanut, assistance with pod maturity clinics prior to harvest is essential. Funds requested for this project will be used to address important issues faced by virtually all peanut growers. Active engagement of Cooperative Extension Service agents in problem solving will also be included in this project.

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Expanding On-Farm Testing Through Large-Scale Research

National Peanut Board(1/01/22 - 6/30/23)

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Expanding On-Farm Testing Through Large-Scale Research

Sponsor: National Peanut Board

Start Date: 1/01/22

End Date: 6/30/23

Abstract

Growers often prefer to see results from large-scale, on-farm research that are developed locally to assist them with management decisions. The research community also has demonstrated that using larger plots often leads to better results from testing. The challenge has always been land and resource allocation needed to compare many treatments and treatment combinations. Small-plot testing has been an effective option and is reflective of treatment differences in some but not all instances. To address the need to compare some treatments in larger plots, the NCPGA, Extension Administration, faculty in the Department of Crop and Soil Sciences and the Department of Entomology and Plant Pathology, and several agribusiness companies purchased a dump cart with the capacity to weigh large quantities of peanuts in the field and dump peanuts into large, tractor trailers. This equipment will facilitate a greater number of experiments with larger plots and will result in a greater number of Extension agents conducting on-farm research. The dump cart was built in spring 2021 and was used to harvest peanuts in replicated trials in five counties (10 trials). The goal in 2022 is to expand research to additional counties. Extension specialists and agents will coordinate approximately 15 trials in 2022 comparing varieties, pest management treatments and plant growth regulators based on discussions in spring 2022. The NCPGA will also provide input into what comparisons need to be made.

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Reducing Tobacco Equipment Injuries

NC Tobacco Trust Fund Commission(11/01/18 - 10/31/21)

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Reducing Tobacco Equipment Injuries

Sponsor: NC Tobacco Trust Fund Commission

Start Date: 11/01/18

End Date: 10/31/21

Abstract

Agriculture is N C’s leading industry and its most dangerous with a fatality rate six times greater than the average of all industries. While tobacco handling and harvesting equipment is not the highest source of injuries and fatalities in N C, it is a significant cause of tobacco production-related deaths and injuries. The NC Agricultural Foundation, in partnership with the NC Agromedicine Institute will target tobacco growers and workers by: 1) reviewing all tobacco equipment related injuries and fatalities in the last 5 years to determine the root cause of those events; 2) developing short, high impact videos in both English and Spanish that graphically show similar scenarios of people being caught in equipment; 3) providing training in equipment safety and first on scene response for tobacco growers and workers; 4) conducting health screenings both at educational programs and during tobacco field work; 5) providing SMV signs and first aid kits to all growers who attend our programs.

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Automation in Container Nursery Weed Control

Horticultural Research Institute(3/01/20 - 12/31/21)

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Automation in Container Nursery Weed Control

Sponsor: Horticultural Research Institute

Start Date: 3/01/20

End Date: 12/31/21

Abstract

North Carolina State University will develop a prototype application system to safety and economically control weeds in container nursery crop production systems. The mechanized system will deliver targeted low-volume, herbicide applications to the substrate surface of individual pots. The successful deployment of this system will reduce labor costs by over 20% and allow growers to reallocate labor to more productive tasks. Additionally, utilization of the proposed application system would target herbicide applications where needed, reducing waste pesticide applicator exposure.

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Mechanized Weed Control in Container Nurseries

US Dept. of Agriculture - Agricultural Marketing Service (USDA AMS)(1/01/19 - 12/31/20)

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Mechanized Weed Control in Container Nurseries

Sponsor: US Dept. of Agriculture - Agricultural Marketing Service (USDA AMS)

Start Date: 1/01/19

End Date: 12/31/20

Abstract

Weed control remains one of the most costly aspects of container nursery crop production. Growers commonly use three to six applications of preemergence herbicides per year but weeds still emerge. As there are no selective postemergence herbicides for broadleaf weed control, growers must rely on hand labor to remove emerged weeds. Supplemental hand weeding costs have been estimated to be as much as $4000 per acre per year. In recent research, we demonstrated that increasing the frequency of hand weeding could reduce weed reproduction and spread by up to 80% and (more importantly) reduce cumulative weed control costs by an average of 40% compared to common grower practices. Growers trained in these principles understood the implications and advantages but few have adopted this strategy. When asked why, the most common answer is limited availability of labor to allocate to this task. In the 2017 State of The Industry survey, “labor issues” was ranked as the number one concern by 68% of respondents (http://www.nurserymag.com/article/labor/). Additionally, 39% of survey respondents reported that the availability of labor limited new hires. Clearly a weed control alternative that does not rely on labor for hand weeding is needed. In field nursery crop production, as in many other crops, postemergence herbicides may be applied as a directed application avoiding contact with the foliage of the crop plants. When applied in this manner, even non-selective herbicides may be used to control weeds around woody crop species. In container grown trees, non-selective herbicides such as diquat may be used to control emerged weeds using a traditional backpack sprayer. But in the majority of crop species grown in containers, such applications are rarely possible because of the crop density (greater than 20,000 plants per acre), and the close proximity of the crop canopy to the rooting substrate surface. The objective of this proposal is to develop a prototype application system that can deliver targeted low-volume, herbicide applications to the substrate surface of individual pots. The prototype system will turn the pot 360o while uniformly applying preemergence and/or postemergence herbicides in an ultra-low volume, below the crop canopy. Such a device could be attached to a potting line, a mechanized pruning machine, or to nursery robots. Deployment of such as system has the potential to dramatically reduce the need for hand weeding in many woody nursery crop species. Traditional broadcast applications of herbicides in container nurseries result in as much as 80% of the applied herbicide falling on the ground between pots. Therefore, utilization of the proposed application system would target herbicide applications where needed, avoiding waste and potential environmental contamination.

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Cotton Quality Mapping and Harvest Logistics with RFID Tracking

Cotton, Inc. (No pre-award costs/accounts allowed)(1/01/18 - 12/31/23)

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Cotton Quality Mapping and Harvest Logistics with RFID Tracking

Sponsor: Cotton, Inc. (No pre-award costs/accounts allowed)

Start Date: 1/01/18

End Date: 12/31/23

Abstract

Modern cotton harvesting equipment has the capability to weigh, estimate moisture content of, and discretely identify round modules when completed. These data along with bale location should allow tracking of gin fiber quality data all the way back to a field area via the permanent bale indicator (PBI) assigned at the gin and the radio-frequency Harvest ID (HID) tag assigned at harvest. The ultimate purpose of this project is a proof-of-concept linking fiber quality data to specific field locations within a cotton field. The objectives of this research are: 1. To identify data workflows and best management practices to connect USDA fiber quality data to specific round modules, 2. to map fiber quality to spatial locations within production fields, and 3. to better understand logistics management in modern cotton harvest such as in-field transport and prioritizing high-moisture round modules.

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Aerial Imagery and Sensors for Peanut Management

NC Peanut Growers Association, Inc.(1/01/18 - 12/31/18)

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Aerial Imagery and Sensors for Peanut Management

Sponsor: NC Peanut Growers Association, Inc.

Start Date: 1/01/18

End Date: 12/31/18

Abstract

This project will address an area of interest to peanut growers; plant stress management during the production season. Peanut may be subject to various forms of plant stress during the growing season. These include drought, nutrient deficiency, and disease. A preliminary study using the GreenSeeker® sensor indicated that sensor technology could be used to monitor and quantify the effects of plant disease. A second study looked at Unmanned Aerial Vehicle (UAV) based sensors to measure and assess the impact of stress on peanut development. This project will continue efforts to develop cost effective and practical sensor and imaging protocols to monitor stress in peanut during development.

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Technology Enhancement for Peanut Harvest and Management

National Peanut Board(1/01/16 - 12/31/17)

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Technology Enhancement for Peanut Harvest and Management

Sponsor: National Peanut Board

Start Date: 1/01/16

End Date: 12/31/17

Abstract

Several technologies have been investigated in recent years to improve harvest efficiency for peanut. Among these are automatic chain speed control, variable depth digging control, and a cost effective peanut yield monitor. This project will complement those efforts by continuing development of a modified peanut digger-shaker-inverter design that will allow for a smoother flow of plant material with reduced losses. Initial efforts to redesign the shaker mechanism have shown promise but need to be continued with fresh engineering expertise and concepts. Secondly, peanut may be subject to various forms of plant stress during the growing season. These include drought, nutrient deficiency, and disease. A preliminary study using the GreenSeeker® sensor indicated that sensor technology could be used to monitor and quantify the effects of plant disease. This project will continue efforts to develop cost effective and practical sensor and imaging protocols to monitor stress in peanut during development.

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Comprehensive Wetland Monitoring Network and Spatial Database for North Carolina’s Coastal Plain and Piedmont Regions

US Environmental Protection Agency (EPA)(10/01/14 - 9/30/20)

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Comprehensive Wetland Monitoring Network and Spatial Database for North Carolina’s Coastal Plain and Piedmont Regions

Sponsor: US Environmental Protection Agency (EPA)

Start Date: 10/01/14

End Date: 9/30/20

Abstract

Wetland monitoring in NC has a ten-year history with much data collected on many wetland types. Important stakeholders are working with NC DENR to develop and implement a Wetland Program Plan. During this process, the agency was reorganized and funding was cut to NC’s Wetland Monitoring Program. As a land-grant institute whose mission is to protect the health and well-being of its citizens and natural resources, we must buffer the effects the elimination of this program will have on NC. This proposal seeks to expand the work done by the Wetlands Monitoring Program in NC by executing several key components documented in the EPA approved WPP. This proposal will expand and continue the monitoring of hydrology, water quality, soils, and biota at 18 long-term sites. The data from these sites will be analyzed to assess trends in wetland condition and establish baseline metrics for wetland mitigation as well as monitor other long term changes in wetland services. The efficacy of innovative technology will be tested to collect remote data. The proposal also will develop a comprehensive database for wetland monitoring data collected in NC. This will include establishing a wetlands monitoring technical workgroup to contribute to a more unified and robust monitoring effort in NC. The database will include data from a wide number of entities along with protocols for entering future data. This centralized wetland database will provide efficient access to wetland information for state and federal agencies as well as the public, including mitigation providers and conservation organizations.

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Sensor Calibration For Variable Rate Nitrogen Sidedress Application

Corn Growers Association of NC, Inc.(2/01/13 - 1/31/16)

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Sensor Calibration For Variable Rate Nitrogen Sidedress Application

Sponsor: Corn Growers Association of NC, Inc.

Start Date: 2/01/13

End Date: 1/31/16

Abstract

This project will develop a crop sensor-based calibration for sidedress N application to corn, evaluate the most appropriate corn growth stage for the calibration algorithm, design a reference calibration strip appropriate for commercial field adoption, and evaluate available commercial sensor models, mounting configurations, and usage protocols.

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