Open Access. Powered by Scholars. Published by Universities.®

Agriculture Commons

Open Access. Powered by Scholars. Published by Universities.®

42,385 Full-Text Articles 31,355 Authors 7,355,379 Downloads 207 Institutions

All Articles in Agriculture

Faceted Search

42,385 full-text articles. Page 2 of 783.

Technoference Strategies: Managing Family Screen Time, Brandon McDaniel, David G. Schramm 2019 Parkview Health

Technoference Strategies: Managing Family Screen Time, Brandon Mcdaniel, David G. Schramm

All Current Publications

This fact sheet provides steps and strategies to manage family screen time.


The Integration Of Blockchain Technology To The Beef Industry – A Comparative Analysis, Cole N. Hancock 2019 University of Pennsylvania

The Integration Of Blockchain Technology To The Beef Industry – A Comparative Analysis, Cole N. Hancock

Social Impact Research Experience (SIRE)

This paper seeks to explore the different plausible and implemented applications of blockchain technology in the beef industry in two representative markets: The United States and Kenya. Previous papers discuss implementation of blockchain to the beef industry, without a focus on the variations between beef industries and supply chains in various countries, a gap this paper aims to address. The main method of research has been primary, traveling to these countries and engaging in conversations with various stakeholders about their industry’s supply chain and the problems and opportunities therein. Overall this paper finds that the integration of blockchain to ...


Techno-Economic Analysis (Tea) And Life Cycle Assessment (Lca) Of A Low Temperature Closed-Cycle Grain Drying System, Mingjun Ma, Kurt A. Rosentrater 2019 Iowa State University

Techno-Economic Analysis (Tea) And Life Cycle Assessment (Lca) Of A Low Temperature Closed-Cycle Grain Drying System, Mingjun Ma, Kurt A. Rosentrater

Kurt A. Rosentrater

The aim of this study was to understand the environmental and economic impact of the low temperature closed-cycle grain drying system by using techno-economic analysis (TEA) and life cycle assessment (LCA). For TEA, three scales including small (60 bu/batch), medium (600 bu/batch) and large (6000 bu/batch) were chosen for analysis the total annual drying cost and unit drying cost. For LCA, the greenhouse gasses (GHG) emission was the only environmental impact that considered in this study, since the electricity was the only energy source for this drying system. The TEA result shows that the drying costs for ...


Assessing A Reciprocal International Student Travel Exchange: The Iowa State University And University Of Costa Rica Intercambio, Mark L. Gleason, Amy Wang Wong, Donald R. Lewis, Luis Felipe Arauz Cavallini, Barbara Clawson, Kevin R. Duerfeldt, Hayley M. Nelson, Gaile R. Nonnecke 2019 Iowa State University

Assessing A Reciprocal International Student Travel Exchange: The Iowa State University And University Of Costa Rica Intercambio, Mark L. Gleason, Amy Wang Wong, Donald R. Lewis, Luis Felipe Arauz Cavallini, Barbara Clawson, Kevin R. Duerfeldt, Hayley M. Nelson, Gaile R. Nonnecke

Donald Lewis

The creation and educational impact of a reciprocal travel exchange program for student groups in horticulture and allied sciences between Iowa State University (ISU) and the University of Costa Rica (UCR) are described. The program, called the “Intercambio,” (“exchange,” in English), has facilitated group travel for 10- to 12-day periods to farms and agricultural research centers in the host country annually since 1999. The article explores how the Intercambio began and factors that have helped to sustain it, to provide ideas for educators interested in initiating similar exchanges. Analysis of responses to a 2015 written survey of student participants indicated ...


The Biotic And Abiotic Carbon Monoxide Formation During Aerobic Co-Digestion Of Dairy Cattle Manure With Green Waste And Sawdust, Sylwia Stegenta-Dąbrowska, Grzegorz Drabczyński, Karolina Sobieraj, Jacek A. Koziel, Andrzej Białowiec 2019 Wrocław University of Environmental and Life Sciences

The Biotic And Abiotic Carbon Monoxide Formation During Aerobic Co-Digestion Of Dairy Cattle Manure With Green Waste And Sawdust, Sylwia Stegenta-Dąbrowska, Grzegorz Drabczyński, Karolina Sobieraj, Jacek A. Koziel, Andrzej Białowiec

Jacek A. Koziel

Carbon monoxide (CO), an air pollutant and a toxic gas to humans, can be generated during aerobic digestion of organic waste. CO is produced due to thermochemical processes, and also produced or consumed by cohorts of methanogenic, acetogenic, or sulfate-reducing bacteria. The exact mechanisms of biotic and abiotic formation of CO in aerobic digestion (particularly the effects of process temperature) are still not known. This study aimed to determine the temporal variation in CO concentrations during the aerobic digestion as a function of process temperature and activity of microorganisms. All experiments were conducted in controlled temperature reactors using homogeneous materials ...


Identifying Challenges Pre-Service Teachers Encountered When Teaching Curriculum For Agricultural Science Education (Case) Coursework During Student Teaching, Trent Wells, Mark S. Hainline, Scott W. Smalley 2019 Southern Arkansas University

Identifying Challenges Pre-Service Teachers Encountered When Teaching Curriculum For Agricultural Science Education (Case) Coursework During Student Teaching, Trent Wells, Mark S. Hainline, Scott W. Smalley

Scott Smalley

Student teaching is the capstone experience in an agricultural teacher preparation program (Edgar, Roberts, & Murphy, 2011). During student teaching, pre-service teachers work with cooperating teachers to learn to effectively deliver instruction (Feiman-Nemser & Buchmann, 1987) on topics such as agriscience, agricultural mechanics, horticultural science, and so forth, to secondary students. School-based agricultural education (SBAE) also includes instruction in applied academic content (Stubbs & Myers, 2015). Curriculum for Agricultural Science Education (CASE) has emerged in recent years to provide engaging, academically-reinforced coursework for SBAE teachers and students across the United States (CASE, n.d.a). Thus, it is reasonable to expect pre-service teachers may be responsible for teaching CASE coursework at their student teaching placement sites. We sought to identify challenges that pre-service teachers may encounter when teaching CASE coursework. Through two face-to-face focus group interviews conducted at both the mid-semester and end-of-semester student teacher meetings, we identified three primary themes: 1) accessibility to resources; 2) influence of cooperating teachers; and 3) applicability of coursework based on local needs. We concluded these pre-service teachers encountered both positive and negative experiences related to teaching CASE coursework and recommended that pre-service teachers be adequately prepared to engage in CASE coursework prior to student teaching.


The Biotic And Abiotic Carbon Monoxide Formation During Aerobic Co-Digestion Of Dairy Cattle Manure With Green Waste And Sawdust, Sylwia Stegenta-Dąbrowska, Grzegorz Drabczyński, Karolina Sobieraj, Jacek A. Koziel, Andrzej Białowiec 2019 Wrocław University of Environmental and Life Sciences

The Biotic And Abiotic Carbon Monoxide Formation During Aerobic Co-Digestion Of Dairy Cattle Manure With Green Waste And Sawdust, Sylwia Stegenta-Dąbrowska, Grzegorz Drabczyński, Karolina Sobieraj, Jacek A. Koziel, Andrzej Białowiec

Agricultural and Biosystems Engineering Publications

Carbon monoxide (CO), an air pollutant and a toxic gas to humans, can be generated during aerobic digestion of organic waste. CO is produced due to thermochemical processes, and also produced or consumed by cohorts of methanogenic, acetogenic, or sulfate-reducing bacteria. The exact mechanisms of biotic and abiotic formation of CO in aerobic digestion (particularly the effects of process temperature) are still not known. This study aimed to determine the temporal variation in CO concentrations during the aerobic digestion as a function of process temperature and activity of microorganisms. All experiments were conducted in controlled temperature reactors using homogeneous materials ...


Comparing Integrated Pest Management And Protectant Strategies For Control Of Apple Scab And Codling Moth In An Iowa Apple Orchard, M. L. Gleason, M. K. Ali, P. A. Domoto, D. R. Lewis, M. D. Duffy 2019 Iowa State University

Comparing Integrated Pest Management And Protectant Strategies For Control Of Apple Scab And Codling Moth In An Iowa Apple Orchard, M. L. Gleason, M. K. Ali, P. A. Domoto, D. R. Lewis, M. D. Duffy

Donald Lewis

Integrated peat management (IPM) strategies for control of apple scab and codling moth (Cydia pomonolla) were compared with a traditional protestant spray program in an Iowa apple orchard over a 3-year period. IPM tactics for scab included a postinfection spray program and an integrated, reduced-spray program based on the use of demethylation inhibitor fungicides. Codling moth spray timing was determined by pheromone-trap captures and degree-day models. The IPM tactics resulted in an average of three fewer fungicide sprays and two fewer insecticide sprays than the protestant program. Neither yield, incidence of fruit scab, nor incidence of codling moth injury on ...


Intrusive Advising And Retention Practices In A College Of Agriculture: A Case Study Of First-Year Student Experiences, Amanda Martin 2019 Louisiana State University

Intrusive Advising And Retention Practices In A College Of Agriculture: A Case Study Of First-Year Student Experiences, Amanda Martin

LSU Doctoral Dissertations

The purpose of this qualitative case study was to explore the perceptions of first-year students who experienced intrusive advising and retention initiatives in the College of Agriculture at Louisiana State University (LSU). Research participants consisted of 20 first-year students enrolled in the college in the fall of 2018. One-on-one, face-to-face interviews with first-year students were conducted to gain insight and understand student experiences with intrusive advising and retention initiatives within the College of Agriculture. College student retention and factors that contribute to understanding retention have been extensively studied (Astin, 1993; Braxton, Hirschy, & McClendon, 2004; Habley, Bloom, & Robbins, 2012; Kuh, Schuh, Whitt, & Kinzie, 2010; Tinto, 2012), but ...


Oxytree Pruned Biomass Torrefaction: Process Kinetics, Kacper Świechowski, Sylwia Stegenta-Dąbrowska, Marek Liszewski, Przemysław Bąbelewski, Jacek A. Koziel, Andrzej Białowiec 2019 Wrocław University of Environmental and Life Sciences

Oxytree Pruned Biomass Torrefaction: Process Kinetics, Kacper Świechowski, Sylwia Stegenta-Dąbrowska, Marek Liszewski, Przemysław Bąbelewski, Jacek A. Koziel, Andrzej Białowiec

Agricultural and Biosystems Engineering Publications

Oxytree is a fast-growing energy crop with C4 photosynthesis. In this research, for the first time, the torrefaction kinetic parameters of pruned Oxytree biomass (Paulownia clon in Vitro 112) were determined. The influence of the Oxytree cultivation method and soil class on the kinetic parameters of the torrefaction was also investigated. Oxytree pruned biomass from a first-year plantation was subjected to torrefaction within temperature range from 200 to 300 °C and under anaerobic conditions in the laboratory-scale batch reactor. The mass loss was measured continuously during the process. The relative mass loss increased from 1.22% to 19.56% with ...


New Methods Of Removing Debris And High-Throughput Counting Of Cyst Nematode Eggs Extracted From Field Soil, Kalwa Upender, Christopher Legner, Elizabeth Wlezien, Gregory Tylka, Santosh Pandey 2019 Iowa State University

New Methods Of Removing Debris And High-Throughput Counting Of Cyst Nematode Eggs Extracted From Field Soil, Kalwa Upender, Christopher Legner, Elizabeth Wlezien, Gregory Tylka, Santosh Pandey

Gregory Tylka

The soybean cyst nematode (SCN), Heterodera glycines, is the most damaging pathogen of soybeans in the United States. To assess the severity of nematode infestations in the field, SCN egg population densities are determined. Cysts (dead females) of the nematode must be extracted from soil samples and then ground to extract the eggs within. Sucrose centrifugation commonly is used to separate debris from suspensions of extracted nematode eggs. We present a method using OptiPrep as a density gradient medium with improved separation and recovery of extracted eggs compared to the sucrose centrifugation technique. Also, computerized methods were developed to automate ...


Oxytree Pruned Biomass Torrefaction: Process Kinetics, Kacper Świechowski, Sylwia Stegenta-Dąbrowska, Marek Liszewski, Przemysław Bąbelewski, Jacek A. Koziel, Andrzej Białowiec 2019 Wrocław University of Environmental and Life Sciences

Oxytree Pruned Biomass Torrefaction: Process Kinetics, Kacper Świechowski, Sylwia Stegenta-Dąbrowska, Marek Liszewski, Przemysław Bąbelewski, Jacek A. Koziel, Andrzej Białowiec

Jacek A. Koziel

Oxytree is a fast-growing energy crop with C4 photosynthesis. In this research, for the first time, the torrefaction kinetic parameters of pruned Oxytree biomass (Paulownia clon in Vitro 112) were determined. The influence of the Oxytree cultivation method and soil class on the kinetic parameters of the torrefaction was also investigated. Oxytree pruned biomass from a first-year plantation was subjected to torrefaction within temperature range from 200 to 300 °C and under anaerobic conditions in the laboratory-scale batch reactor. The mass loss was measured continuously during the process. The relative mass loss increased from 1.22% to 19.56% with ...


The Effect Of Rapid Chilling Of Pork Carcasses During The Early Postmortem Period On Fresh Pork Quality, Aaron Blakely, Kenneth J. Prusa, Christine A. Fedler, Grant B. Sherrard, Edward M. Steadham, Kenneth J. Stalder, Carol L. Lorenzen, Elisabeth Huff-Lonergan, Steven M. Lonergan 2019 Iowa State University

The Effect Of Rapid Chilling Of Pork Carcasses During The Early Postmortem Period On Fresh Pork Quality, Aaron Blakely, Kenneth J. Prusa, Christine A. Fedler, Grant B. Sherrard, Edward M. Steadham, Kenneth J. Stalder, Carol L. Lorenzen, Elisabeth Huff-Lonergan, Steven M. Lonergan

Animal Science Publications

The objective was to investigate the effects of blast chilling on pork quality in cuts from the Longissimus thoracic et lumborum (LM), Psoas major (PM), Semimembranosus (SM; both superficial [SMS] and deep [SMD] portions) and the Triceps brachii (TB). Forty carcasses (10 carcasses per replication) were split and sides were assigned to either blast chill (BC, –32°C for 90 min, followed by spray chill at 2°C for 22.5 h) or conventional chill (CC, spray chilled at 2°C for 24 h) regimens. The LM from BC sides had lower (P < 0.05) temperature at 2 h postmortem (CC 21.8°C, BC 9.7°C), 4 h (CC 13.3°C, 3.8°C BC), 22 h (CC 4.2°C, BC 1.4°C), and 30 h (CC 0.4°C, BC –0.2°C). The LM pH in BC sides was higher at 4 h (CC 6.09, BC 6.34), 22 h (CC 5.81, BC 5.89), and 30 h (CC 5.68, BC 5.74) postmortem. The BC resulted in higher (P < 0.05) 30 h postmortem pH in the SM compared to the CC regime (CC 5.68, BC 5.74). The BC sides had increased (P < 0.05) purge in the PM (CC 0.48%, BC 0.74%) and increased (P < 0.05) cook loss in chops from the LM (CC 22.37%, BC 24.24%). The PM from BC sides were more juicy (CC 7.50, BC 8.30), less chewy (CC 2.80, BC 2.10), and more tender (CC 7.90, BC 8.60). Chops from the LM of BC sides had greater Warner-Bratzler shear force (CC 2.00, BC 2.30). Color was affected in the SM with BC sides showing darker color score (CC 3.00, BC 3.20) and redder Hunter a value (CC 16.35, BC 16.02). Chilling treatment did not affect sarcomere length in the LM. Treatment did not affect postmortem proteolysis in any cut. The response to chilling regimen is different across different muscles which may be caused by location, rate of chilling, and fiber type.


Methods For Reproductive Tract Scoring As A Tool For Improving Sow Productivity, M. R. Romoser, B. J. Hale, J. T. Seibert, T. Gall, C. J. Rademacher, K. J. Stalder, L. H. Baumgard, A. F. Keating, J. W. Ross 2019 Iowa State University

Methods For Reproductive Tract Scoring As A Tool For Improving Sow Productivity, M. R. Romoser, B. J. Hale, J. T. Seibert, T. Gall, C. J. Rademacher, K. J. Stalder, L. H. Baumgard, A. F. Keating, J. W. Ross

Kenneth J Stalder

Improving sow lifetime productivity (SLP) is essential for maximizing farm profitability. Study objectives were to determine the accuracy for different vulva scoring methods in a commercial production system and to assess whether gilt reproductive tract scoring (evaluated by vulva width; VW) prior to puberty could serve as useful gilt selection criteria. To accomplish this objective, 958 prepubertal replacement gilts in a commercial system were evaluated at approximately 15 weeks of age. Gilt body weight was recorded in addition to four different methods to evaluate VW. Methods for VW assessment included digital caliper measurement (mm), visual evaluation and scoring by trained ...


Determining The Time Required To Detect Induced Sow Lameness Using An Embedded Microcomputer-Based Force Plate System, Brady McNeil, Julia Calderón Díaz, Caitlyn Bruns, Joe Stock, Suzanne Millman, Anna Johnson, Locke Karriker, Kenneth Stalder 2019 Iowa State University

Determining The Time Required To Detect Induced Sow Lameness Using An Embedded Microcomputer-Based Force Plate System, Brady Mcneil, Julia Calderón Díaz, Caitlyn Bruns, Joe Stock, Suzanne Millman, Anna Johnson, Locke Karriker, Kenneth Stalder

Kenneth J Stalder

Lameness in swine breeding herds is a common cause of compromised animal well-being and economic loss to pig producers. Current lameness assessment methods are subjective and require intensive training. It has been shown that embedded microcomputer-based force plate systems can detect lameness by measuring weight distributions in livestock. The objective of this study was to determine the minimum time required to record data from each individual load cell in the force plate system to obtain accurate sow weight distributions on each leg. Sound and induced lameness states were evaluated to ensure that time requirements were similar for both situations. Lameness ...


Methods For Reproductive Tract Scoring As A Tool For Improving Sow Productivity, M. R. Romoser, B. J. Hale, J. T. Seibert, T. Gall, C. J. Rademacher, K. J. Stalder, L. H. Baumgard, A. F. Keating, J. W. Ross 2019 Iowa State University

Methods For Reproductive Tract Scoring As A Tool For Improving Sow Productivity, M. R. Romoser, B. J. Hale, J. T. Seibert, T. Gall, C. J. Rademacher, K. J. Stalder, L. H. Baumgard, A. F. Keating, J. W. Ross

Aileen Keating

Improving sow lifetime productivity (SLP) is essential for maximizing farm profitability. Study objectives were to determine the accuracy for different vulva scoring methods in a commercial production system and to assess whether gilt reproductive tract scoring (evaluated by vulva width; VW) prior to puberty could serve as useful gilt selection criteria. To accomplish this objective, 958 prepubertal replacement gilts in a commercial system were evaluated at approximately 15 weeks of age. Gilt body weight was recorded in addition to four different methods to evaluate VW. Methods for VW assessment included digital caliper measurement (mm), visual evaluation and scoring by trained ...


Emissions Of Ammonia, Hydrogen Sulfide, And Odor Before, During, And After Slurry Removal From A Deep-Pit Swine Finisher, Steven Hoff, Dwaine S. Bundy, Minda A. Nelson, Brian C. Zelle, Larry D. Jacobson, Albert J. Heber, Jinqin Ni, Yuanhui Zhang, Jacek A. Koziel, David B. Beasley 2019 Iowa State University

Emissions Of Ammonia, Hydrogen Sulfide, And Odor Before, During, And After Slurry Removal From A Deep-Pit Swine Finisher, Steven Hoff, Dwaine S. Bundy, Minda A. Nelson, Brian C. Zelle, Larry D. Jacobson, Albert J. Heber, Jinqin Ni, Yuanhui Zhang, Jacek A. Koziel, David B. Beasley

Jacek A. Koziel

It is a common practice in the midwestern United States to raise swine in buildings with under-floor slurry storage systems designed to store manure for up to one year. These so-called “deep-pit” systems are a concentrated source for the emissions of ammonia (NH3), hydrogen sulfide (H2S), and odors. As part of a larger six-state research effort (U.S. Department of Agriculture-Initiative for Future Agriculture and Food Systems Project, “Aerial Pollutant Emissions from Confined Animal Buildings”), real-time NH3 and H2S with incremental odor emission data were collected for two annual slurry removal events. For this study, two 1000-head deep-pit swine finishing ...


Comparison Of Measured Total Suspended Particulate Matter Concentrations Using Tapered Element Oscillating Microbalance And A Total Suspended Particulate Sampler, Sheryll B. Jerez, Yuanhui Zhang, Joshua W. McClure, Larry Jacobson, Albert Heber, Steven Hoff, Jacek A. Koziel, David Beasley 2019 University of Illinois

Comparison Of Measured Total Suspended Particulate Matter Concentrations Using Tapered Element Oscillating Microbalance And A Total Suspended Particulate Sampler, Sheryll B. Jerez, Yuanhui Zhang, Joshua W. Mcclure, Larry Jacobson, Albert Heber, Steven Hoff, Jacek A. Koziel, David Beasley

Jacek A. Koziel

A comparison of the concentration of the total suspended particulate (TSP) matter measured by the tapered element oscillating microbalance (TEOM) monitor and the isokinetic TSP samplers developed at the University of Illinois was carried out in several types of confinement livestock buildings. In a majority of the measurements done, the dust concentration measured by the TEOM monitor was lower than the University of Illinois at Urbana-Champaign (UIUC) isokinetic TSP sampler; the TEOM monitor tended to underestimate the total dust concentration by as much as 54%. The difference in measurements can be attributed to the sampling efficiency of the TEOM monitor ...


“Cyst-Ained” Research Into Heterodera Parasitism, Parijat S. Juvale, Thomas J. Baum 2019 Iowa State University

“Cyst-Ained” Research Into Heterodera Parasitism, Parijat S. Juvale, Thomas J. Baum

Thomas Baum

Nematodes are roundworms that constitute the phylum Nematoda. Only a small fraction of nematode genera contains plant-parasitic or animal-parasitic species, while the majority of nematodes are free-living [1]. Heterodera glycines, the soybean cyst nematode, is a plant-parasitic nematode causing major damage to soybean production worldwide. Annual United States yield loss estimates due to H. glycines range up to $1.2 billion, likely making this nematode the most serious pathogen threat to sustainable soybean production [2]. While cyst nematode-resistant soybean cultivars are available, they do not control all H. glycines biotypes present in a given field and, therefore, select for virulent ...


Statawaars: A Promoter Motif Associated With Spatial Expression In The Major Effector-Producing Tissues Of The Plant-Parasitic Nematode Bursaphelenchus Xylophilus, Margarida Espada, Sebastian Eves-van den Akker, Tom Maier, Paramasivan Vijayapalani, Thomas Baum, Manuel Mota, John T. Jones 2019 Universidade de Évora

Statawaars: A Promoter Motif Associated With Spatial Expression In The Major Effector-Producing Tissues Of The Plant-Parasitic Nematode Bursaphelenchus Xylophilus, Margarida Espada, Sebastian Eves-Van Den Akker, Tom Maier, Paramasivan Vijayapalani, Thomas Baum, Manuel Mota, John T. Jones

Thomas Baum

Background: Plant-parasitic nematodes cause severe damage to a wide range of crop and forest species worldwide. The migratory endoparasitic nematode, Bursaphelenchus xylophilus, (pinewood nematode) is a quarantine pathogen that infects pine trees and has a hugely detrimental economic impact on the forestry industry. Under certain environmental conditions large areas of infected trees can be destroyed, leading to damage on an ecological scale. The interactions of B. xylophilus with plants are mediated by secreted effector proteins produced in the pharyngeal gland cells. Identification of effectors is important to understand mechanisms of parasitism and to develop new control measures for the pathogens ...


Digital Commons powered by bepress