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Development Of A Mobile Robotic Phenotyping System For Growth Chamber-Based Studies Of Genotype X Environment Interactions, Dylan Shah, Lie Tang, Jingyao Gai, Rajesh Putta-Venkata 2019 Iowa State University

Development Of A Mobile Robotic Phenotyping System For Growth Chamber-Based Studies Of Genotype X Environment Interactions, Dylan Shah, Lie Tang, Jingyao Gai, Rajesh Putta-Venkata

Lie Tang

To increase understanding of the interaction between phenotype and genotype x environment to improve crop performance, large amounts of phenotypic data are needed. Studying plants of a given strain under multiple environments can greatly help to reveal their interactions. To collect the labor-intensive data required to perform experiments in this area, a Mecanum-wheeled, magnetic-tape-following indoor rover has been developed to accurately and autonomously move between and inside growth chambers. Integration of the motor controllers, a robot arm, and a Microsoft Kinect (v2) 3D sensor was achieved in a customized C++ program. Detecting and segmenting plants in a multi-plant environment is ...


Automatic Morphological Trait Characterization For Corn Plants Via 3d Holographic Reconstruction, Supawadee Chaivivatrakula, Lie Tang, Matthew N. Dailey, Akash D. Nakarmi 2019 Ubon Ratchathani University and Asian Institute of Technology

Automatic Morphological Trait Characterization For Corn Plants Via 3d Holographic Reconstruction, Supawadee Chaivivatrakula, Lie Tang, Matthew N. Dailey, Akash D. Nakarmi

Lie Tang

Plant breeding is an extremely important route to genetic improvements that can increase yield and plant adaptability. Genetic improvement requires careful measurement of plant phenotypes or plant trait characteristics, but phenotype measurement is a tedious and error-prone task for humans to perform. High-throughput phenotyping aims to eliminate the problems of manual phenotype measurement. In this paper, we propose and demonstrate the efficacy of an automatic corn plant phenotyping system based on 3D holographic reconstruction. Point cloud image data were acquired from a time-of-flight 3D camera, which was integrated with a plant rotating table to form a screening station. Our method ...


Crop Recognition Under Weedy Conditions Based On 3d Imaging For Robotic Weed Control, Ji Li, Lie Tang 2019 Iowa State University

Crop Recognition Under Weedy Conditions Based On 3d Imaging For Robotic Weed Control, Ji Li, Lie Tang

Lie Tang

A 3D time‐of‐flight camera was applied to develop a crop plant recognition system for broccoli and green bean plants under weedy conditions. The developed system overcame the previously unsolved problems caused by occluded canopy and illumination variation. An efficient noise filter was developed to remove the sparse noise points in 3D point cloud space. Both 2D and 3D features including the gradient of amplitude and depth image, surface curvature, amplitude percentile index, normal direction, and neighbor point count in 3D space were extracted and found effective for recognizing these two types of plants. Separate segmentation algorithms were developed ...


Developing A Low-Cost 3d Plant Morphological Traits Characterization System, Ji Li, Lie Tang 2019 Iowa State University

Developing A Low-Cost 3d Plant Morphological Traits Characterization System, Ji Li, Lie Tang

Lie Tang

A low-cost three-dimensional (3D) plant reconstruction and morphological traits characterization system was developed. Corn plant seedlings were used as research objects for development and validation of the 3D reconstruction and point cloud data analysis algorithms. In this application, precise alignment of multiple 3D views generated by a 3D time-of-flight (ToF) sensor is critical to the 3D reconstruction of a plant. Previous research indicated that there is strong need for high-throughput, high-accuracy, and low-cost 3D plant reconstruction and trait characterization phenotyping systems. This research produced a 3D reconstruction system for indoor plant phenotyping by innovatively integrating a low-cost 2D camera, a ...


Field-Based Robotic Phenotyping For Sorghum Biomass Yield Component Traits Characterization Using Stereo Vision, Yin Bao, Lie Tang 2019 Iowa State University

Field-Based Robotic Phenotyping For Sorghum Biomass Yield Component Traits Characterization Using Stereo Vision, Yin Bao, Lie Tang

Lie Tang

Sorghum is known as a major potential feedstock for biofuel production. Being able to efficiently discover genetic control of many traits over a large number of genotypes, genome-wide association study (GWAS) has become a powerful tool for studying sorghum biomass yield components. However, automated high-throughput field-based plant phenotyping is now the bottleneck for scaling up such experiments. This paper presents an auto-guidance enabled utility tractor which navigates itself between crop rows with a predefined path while collecting stereo images of sorghum samples from both sides of the vehicle. Three levels of stereo camera heads were instrumented to capture images of ...


Within-Row Spacing Sensing Of Maize Plants Using 3d Computer Vision, Akash D. Nakarmi, Lie Tang 2019 Iowa State University

Within-Row Spacing Sensing Of Maize Plants Using 3d Computer Vision, Akash D. Nakarmi, Lie Tang

Lie Tang

Within-row plant spacing plays an important role in uniform distribution of water and nutrients among plants which affects the final crop yield. While manual in-field measurements of within-row plant spacing is time and labour intensive, little work has been done on an alternative automated process. We have attempted to develop an automatic system making use of a state-of-the-art 3D vision sensor that accurately measures within-row maize plant spacing. Misidentification of plants caused by low hanging canopies and doubles were reduced by processing multiple consecutive images at a time and selecting the best inter-plant distance calculated. Based on several small scale ...


Application Of A Formulated Humic Product Can Increase Soybean Yield, Andrew W. Lenssen, Daniel C. Olk, Dana L. Dinnes 2019 Iowa State University

Application Of A Formulated Humic Product Can Increase Soybean Yield, Andrew W. Lenssen, Daniel C. Olk, Dana L. Dinnes

Andrew W. Lenssen

Application of humic products to crops remains controversial. We conducted a field study in Iowa over four environments from 2012 to 2014 examining productivity of soybean [Glycine max (L.) Merr.] receiving foliar application of a humic product at one of four application times based on plant development. Humic product application never influenced soybean height at harvest. Soybean yield increased following application of the humic product in two of four environments, but application timing was not completely consistent between these two environments. In one 2012 environment, humic product application at V2, V6, and R2 resulted in greater yield than the untreated ...


What Do Agricultural And Biological Science Students Use? A Bibliometric Analysis Of Undergraduate Research Projects, Jerome Idiegbeyan-ose, Ayooluwa Aregbesola, Sols Owolabi, Toluwani Eyiolorunshe, Ayotunde Owolabi 2019 Landmark University

What Do Agricultural And Biological Science Students Use? A Bibliometric Analysis Of Undergraduate Research Projects, Jerome Idiegbeyan-Ose, Ayooluwa Aregbesola, Sols Owolabi, Toluwani Eyiolorunshe, Ayotunde Owolabi

Library Philosophy and Practice (e-journal)

The study investigate the citation pattern of undergraduate projects in a private university, Nigeria. Bibliometric method was adopted for the study to analyze the information sources cited in the research projects. The coverage of the study was from 2015 to 2018 set of graduates. Findings revealed that Animal Science programme accounted for the highest citations, while Agricultural Economics had the lowest citations. It was also discovered that an average of 49 citations per project were recorded. Journal articles and books were the most cited materials. The paper concluded and made recommendations.


Drainage Water Quality Impacts Of Agricultural Management Practices: Effectof Manure Application Timing And Cover Crops, Brian Dougherty, Carl Pederson, Matt Helmers, Michelle Soupir, Dan Andersen, Antonio Mallarino, John Sawyer 2019 Iowa State University

Drainage Water Quality Impacts Of Agricultural Management Practices: Effectof Manure Application Timing And Cover Crops, Brian Dougherty, Carl Pederson, Matt Helmers, Michelle Soupir, Dan Andersen, Antonio Mallarino, John Sawyer

John E. Sawyer

A primary objective of this study is to evaluate the impact of various cropping and nutrient management systems on crop yields and drainage water quality. This progress report only includes the first-year corn grain yield results. Treatment comparisons include the impact of early fall vs. late fall vs. spring application of liquid swine manure, nitrification inhibitor with late fall swine manure application, cereal rye cover crop, and gypsum application. These comparisons will be conducted for multiple years and used to develop appropriate manure and nutrient management practices to minimize water contamination potential and enhance the use of swine manure as ...


Predicting Economic Optimal Nitrogen Rate With The Anaerobic Potentially Mineralizable Nitrogen Test, Jason D. Clark, Fabián G. Fernández, Kristen S. Veum, James J. Camberato, Paul R. Carter, Richard B. Ferguson, David W. Franzen, Daniel E. Kaiser, Newell R. Kitchen, Carrie A. M. Laboski, Emerson D. Nafziger, Carl J. Rosen, John E. Sawyer, John F. Shanahan 2019 South Dakota State University

Predicting Economic Optimal Nitrogen Rate With The Anaerobic Potentially Mineralizable Nitrogen Test, Jason D. Clark, Fabián G. Fernández, Kristen S. Veum, James J. Camberato, Paul R. Carter, Richard B. Ferguson, David W. Franzen, Daniel E. Kaiser, Newell R. Kitchen, Carrie A. M. Laboski, Emerson D. Nafziger, Carl J. Rosen, John E. Sawyer, John F. Shanahan

John E. Sawyer

Estimates of mineralizable N with the anaerobic potentially mineralizable N (PMNan) test could improve predictions of corn (Zea mays L.) economic optimal N rate (EONR). A study across eight US midwestern states was conducted to quantify the predictability of EONR for single and split N applications by PMNan. Treatment factors included different soil sample timings (pre-plant and V5 development stage), planting N rates (0 and 180 kg N ha−1), and incubation lengths (7, 14, and 28 d) with and without initial soil NH4–N included with PMNan. Soil was sampled (0–30 cm depth) before ...


United States Midwest Soil And Weather Conditions Influence Anaerobic Potentially Mineralizable Nitrogen, Jason D. Clark, Kristen S. Veum, Fabián G. Fernández, James J. Camberato, Paul R. Carter, Richard B. Ferguson, David W. Franzen, Daniel E. Kaiser, Newell R. Kitchen, Carrie A. M. Laboski, Emerson D. Nafziger, Carl J. Rosen, John E. Sawyer, John F. Shanahan 2019 South Dakota State University

United States Midwest Soil And Weather Conditions Influence Anaerobic Potentially Mineralizable Nitrogen, Jason D. Clark, Kristen S. Veum, Fabián G. Fernández, James J. Camberato, Paul R. Carter, Richard B. Ferguson, David W. Franzen, Daniel E. Kaiser, Newell R. Kitchen, Carrie A. M. Laboski, Emerson D. Nafziger, Carl J. Rosen, John E. Sawyer, John F. Shanahan

John E. Sawyer

Nitrogen provided to crops through mineralization is an important factor in N management guidelines. Understanding of the interactive effects of soil and weather conditions on N mineralization needs to be improved. Relationships between anaerobic potentially mineralizable N (PMNan) and soil and weather conditions were evaluated under the contrasting climates of eight US Midwestern states. Soil was sampled (0–30 cm) for PMNan analysis before pre-plant N application (PP0N) and at the V5 development stage from the pre-plant 0 (V50N) and 180 kg N ha−1 (V5180N) rates and incubated for 7, 14, and 28 d ...


Novel Use Of Conceptual Change Framework Improves Video On Challenging Science Topic, Matthew J. Helmers, Timothy D. Youngquist, Nancy Grudens-Schuck 2019 Iowa State University

Novel Use Of Conceptual Change Framework Improves Video On Challenging Science Topic, Matthew J. Helmers, Timothy D. Youngquist, Nancy Grudens-Schuck

Matthew J. Helmers

Educational campaigns are more complicated when members of our audiences hold scientific misconceptions related to new technologies. Our prairie strips research and education team produced a brief, focused video aimed to dispel a misconception related to the effect of prairie strip plants' roots on agricultural drain tiles in the Midwest. Our "Field Tile Investigation" video was based on the conceptual change framework from science education and featured a discrepant event. The goal was to move farmers, landowners, and their advisors to an understanding of prairie strips that was more compatible with the scientific standard.


Canopy Chamber Measurements Of Carbon Dioxide Fluxes In Corn And Soybean Fields, Zhuangji Wang, Chenyi Luo, Thomas J. Sauer, Matthew J. Helmers, Liukang Xu, Robert Horton 2019 U.S. Department of Agriculture

Canopy Chamber Measurements Of Carbon Dioxide Fluxes In Corn And Soybean Fields, Zhuangji Wang, Chenyi Luo, Thomas J. Sauer, Matthew J. Helmers, Liukang Xu, Robert Horton

Matthew J. Helmers

Crop canopy CO2 exchange rate (CER) includes crop photosynthesis and soil/plant respiration. A portable canopy chamber is effective in determining crop CER values at a relatively small spatial (m2) scale. The objectives of this study were to use a canopy chamber to measure CO2 fluxes in corn (Zea mays L.) and soybean [Glycine max (L.) Merr.]. Chamber measurements were performed for 18 and 15 d in 2013 and 2014, respectively. The canopy chamber measures instantaneous CER fluxes, and daily and daytime cumulative CO2 values were calculated from the instantaneous CER. The chamber CER results were ...


Increasing The Efficacy And Integration Of A Biocontrol Tool For Managing Canada Thistle In The Intermountain West, Steve Young 2019 Utah State University

Increasing The Efficacy And Integration Of A Biocontrol Tool For Managing Canada Thistle In The Intermountain West, Steve Young

Funded Research Records

No abstract provided.


Opioid Prevention For Rural Utah Youth Through Prosper, Stacey MacArthur 2019 Utah State University

Opioid Prevention For Rural Utah Youth Through Prosper, Stacey Macarthur

Funded Research Records

No abstract provided.


Effect Of Acetylation On The Mechanical And Thermal Properties Of Soy Flour Elastomers, Kendra A. Allen, Sarah Cady, David Grewell 2019 Iowa State University

Effect Of Acetylation On The Mechanical And Thermal Properties Of Soy Flour Elastomers, Kendra A. Allen, Sarah Cady, David Grewell

Sarah Cady

Biobased fillers were utilized as components in soy-elastomer composites. Soy flour is lightweight, low cost, and high strength, which makes it an ideal alternative to petroleum-derived fillers. However, poor interfacial adhesion and low dispersion within the polymer matrix are limiting factors for composite performance. Soy flour chemically pretreated by acetylation was compounded with synthetic rubber elastomers. In general, soy flour (as received) concentration in the composite is proportional to the ultimate strength. However, soy-elastomer composites with acetylated filler performed similar to the neat elastomer. In addition, the pretreated composite's thermal stability increased and exhibited less phase seperation compared to ...


Upper Midwest Climate Variations: Farmer Responses To Excess Water Risks, Lois Wright Morton, Jonathan Hobbs, J. Gordon Arbuckle, Adam Loy 2019 Iowa State University

Upper Midwest Climate Variations: Farmer Responses To Excess Water Risks, Lois Wright Morton, Jonathan Hobbs, J. Gordon Arbuckle, Adam Loy

J. Gordon Arbuckle

Persistent above average precipitation and runoff and associated increased sediment transfers from cultivated ecosystems to rivers and oceans are due to changes in climate and human action. The US Upper Midwest has experienced a 37% increase in precipitation (1958–2012), leading to increased crop damage from excess water and off-farm loss of soil and nutrients. Farmer adaptive management responses to changing weather patterns have potential to reduce crop losses and address degrading soil and water resources. This research used farmer survey (n = 4778) and climate data (1971–2011) to model influences of geophysical context, past weather, on-farm flood and saturated ...


Understanding Predictors Of Nutrient Management Practice Diversity In Midwestern Agriculture, Hanna Bates, J. Gordon Arbuckle Jr. 2019 Iowa State University

Understanding Predictors Of Nutrient Management Practice Diversity In Midwestern Agriculture, Hanna Bates, J. Gordon Arbuckle Jr.

J. Gordon Arbuckle

Agriculture's negative effect on water quality has become increasingly well documented. Farmers have a range of conservation practices available, yet rate of adoption is not optimal. Extension and other agricultural stakeholders play a key role in promotion of conservation practice adoption. We used survey data to examine relationships between farmers' integration in agricultural social networks and diversity of conservation practices used. Farmers who were more engaged in agricultural organizations and social networks tended to report greater diversity in nutrient best management practices. Conversely, less "connected" farmers reported less management practice diversity. Opportunities for Extension to engage with both groups ...


Farmers And Climate Change: A Cross-National Comparison Of Beliefs And Risk Perceptions In High-Income Countries, Linda S. Prokopy, J. Gordon Arbuckle, Andrew P. Barnes, V. R. Haden, Anthony Hogan, Meredith T. Niles, John Tyndall 2019 Purdue University

Farmers And Climate Change: A Cross-National Comparison Of Beliefs And Risk Perceptions In High-Income Countries, Linda S. Prokopy, J. Gordon Arbuckle, Andrew P. Barnes, V. R. Haden, Anthony Hogan, Meredith T. Niles, John Tyndall

J. Gordon Arbuckle

Climate change has serious implications for the agricultural industry—both in terms of the need to adapt to a changing climate and to modify practices to mitigate for the impacts of climate change. In high-income countries where farming tends to be very intensive and large scale, it is important to understand farmers’ beliefs and concerns about climate change in order to develop appropriate policies and communication strategies. Looking across six study sites—Scotland, Midwestern United States, California, Australia, and two locations in New Zealand—this paper finds that over half of farmers in each location believe that climate change is ...


Potential Economic Impact Of The Goshen/Gering-Ft. Laramie Tunnel Collapse, Jessica J. Groskopf 2019 University of Nebraska-Lincoln

Potential Economic Impact Of The Goshen/Gering-Ft. Laramie Tunnel Collapse, Jessica J. Groskopf

Cornhusker Economics

Goshen and Scotts Bluff Counties reside in the High Plains and receive less than 16 inches of average annual precipitation. This low precipitation makes surface-water irrigation a critical component of modern agriculture in this area. Farmers in these counties produce irrigated alfalfa hay, corn, sugar beets, and dry edible beans, as well as other hay and crops.

Surface-water refers to water derived from melted snow that is delivered through a series of dams and canals from the mountains of Colorado and Wyoming along the North Platte River. This infrastructure, often referred to as “The North Platte Project,” was built by ...


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