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Assessment Of Control Of Ppo-Resistant Palmer Amaranth And Salvage Options In Herbicide-Resistant Cotton, Wyatt D. Coffman 2019 University of Arkansas, Fayetteville

Assessment Of Control Of Ppo-Resistant Palmer Amaranth And Salvage Options In Herbicide-Resistant Cotton, Wyatt D. Coffman

Theses and Dissertations

Palmer amaranth has been the most limiting weed in cotton production in the state of Arkansas for many years. Recently, resistance of Palmer amaranth to the protoporphyrinogen oxidase (PPO)-inhibiting site of action has been discovered at various locations across the cotton-producing region of the state. Cotton varieties have been developed with resistance to synthetic auxin (WSSA Group 4) herbicides. However, research to date has shown PPO-resistant Palmer amaranth to be more difficult to control with herbicides that target alternative sites of action. Herbicide efficacy is also known to vary with weed size, varying spray parameters, and environmental conditions. Preliminary ...


A Silicon Germanium Cmos Linear Voltage Regulator For Wireless Agricultural Applications, Aminta Naidili Castillo Robles 2019 University of Arkansas, Fayetteville

A Silicon Germanium Cmos Linear Voltage Regulator For Wireless Agricultural Applications, Aminta Naidili Castillo Robles

Theses and Dissertations

This thesis presents the design, simulation and test results of a silicon germanium (SiGe) complementary metal-oxide-semiconductor (CMOS) linear regulator. The objective of the circuit is to power other analog devices regardless of the load current and input voltage changes. The application of this regulator is to be part of a project developing a miniaturized semiconductor platform that can be inserted into stems of crops in order to measure data inside the plant and then send it wirelessly to the user. The linear regulator was designed on a BiCMOS SiGe 0.13µm which is a GlobalFoundries process. It has been tested ...


First Step In Recovering Flooded Pastures And Hay Ground, Beth Doran, Brian J. Lang 2019 Iowa State University

First Step In Recovering Flooded Pastures And Hay Ground, Beth Doran, Brian J. Lang

Integrated Crop Management News

Flood waters are receding, but the challenges in recovery for farmers and livestock producers are just beginning. We recommend producers get out in their fields as soon as possible to assess the damage to pastures and hay ground, then check out possible disaster assistance. Look for three things in the assessment: debris, silt on the forage, and thinned or dead forage plants. Debris includes wire, metal and trash that may be injurious to animal health and is usually found along fence lines and in the corners of fields.


Genome-Wide Association Studies In Maize And Sorghum, Preston Hurst 2019 University of Nebraska - Lincoln

Genome-Wide Association Studies In Maize And Sorghum, Preston Hurst

Theses, Dissertations, and Student Research in Agronomy and Horticulture

Genome-wide association studies are used to identify genetic variants associated with a particular phenotype. GWAS has been used in a variety of taxa, from humans, to fish to plants . The present analysis is focused on two species important to the human species: maize and sorghum. A GWAS in maize was carried out on the modification of the Ga1-s allele. The Ga1 locus has long been studied as being involved in a unilateral crossing barrier . However, it has long been suspected that the locus is modified by background genetic factors . GWAS was used to observe candidates for this modification. A series ...


Scouting And Managing For Winter Injury In Alfalfa, Brian J. Lang, Virgil L. Schmitt, Rebecca K. Vittetoe 2019 Iowa State University

Scouting And Managing For Winter Injury In Alfalfa, Brian J. Lang, Virgil L. Schmitt, Rebecca K. Vittetoe

Integrated Crop Management News

Reports of winter injury in alfalfa fields are coming in across the state. Old man winter along with other management factors can take a toll on alfalfa stands. Older stands, stands that were harvested between mid-September and late October, and stands with minimal stubble appear to have suffered the worst winter injury. Additionally, in many fields it is obvious where the snow drifted and provided insulation and protection as those parts of the field are the greenest. Below are issues observed in alfalfa fields across the state along with resources on how to manage fields with winter injury.


Extraction And Quantification Of Hydrolyzable Tannins In Acorns From Different Species Of Oak Trees (Quercus Spp.), Sarah Browning, Marshall E. Woodruff 2019 Stephen F Austin State University

Extraction And Quantification Of Hydrolyzable Tannins In Acorns From Different Species Of Oak Trees (Quercus Spp.), Sarah Browning, Marshall E. Woodruff

Undergraduate Research Conference

Do white-tailed deer (Odocoileus virginianus) prefer to eat certain types of acorns based on tannin content?

Hydrolyzable tannins consist of gallate groups connected via ester linkages to a carbohydrate (D-glucose)

The Prussian Blue method was used to determine hydrolyzable tannin content


Last Chance For Private Pesticide Applicator Recertification, Kristine J. P. Schaefer 2019 Iowa State University

Last Chance For Private Pesticide Applicator Recertification, Kristine J. P. Schaefer

Integrated Crop Management News

Private pesticide applicators whose certification expired in 2018 have until April 15, 2019, to renew their certification if they plan to renew by attending a Continuing Instruction Course (CIC) training program. In order to renew by training an applicator must attend a CIC in each of the three years of their renewal cycle.


Planter Maintenance Tips For 2019, Mark Hanna 2019 Iowa State University

Planter Maintenance Tips For 2019, Mark Hanna

Integrated Crop Management News

Planter maintenance is important for all farmers, particularly those in reduced and no-till systems. A well-maintained planter gives seed its best chance, and with field operations happening in a shortened timeframe this spring, planer maintenance will be as important as ever. Most of the physical responsibility for manipulating soil, placing seed, and getting the seed off to a good start rests on the planter.


Chemical Free Edible Flowers, Elise Abbott 2019 Murray State University

Chemical Free Edible Flowers, Elise Abbott

Scholars Week

Nature is equipped with all the right systems and services in order to be self sustaining. But in the global flower industry, growers are battling insect infestations like never before because of stricter import laws by the United States Department of Agriculture. In order to ensure the processing of their flowers, growers douse them in pesticides making them inedible and harmful to those who work with them. As edible flowers are making their way into the market on cakes and desserts, fresh salads, specialty spreads and much more it's imperative that they are grown in a sustainable and safe ...


Soil Responses To Various Farming Systems In Western Kentucky, Samantha Peterson 2019 Murray State University

Soil Responses To Various Farming Systems In Western Kentucky, Samantha Peterson

Scholars Week

The interactions among the farming systems and the soil, water, biota, and atmosphere control the effects of cultivation on soil properties. Land conversion from forest or pasture ecosystems into crop fields altered soil properties due to the loss of soil organic matter (SOM) and the increase of soil compaction. However in Kentucky, the magnitude of the changes varied among the soil properties. Therefore, the objective of this research was to investigate the changes of selected soil properties include SOM, soil pH, and compaction under different crop fields such as corn-soybean-tobacco rotation (Field #1), continuous corn field (Field #2), hemp field ...


Evaluating Soil Surface Properties In Two Contrasting Tillage Systems, Riley Mabe, Kaeden Mollett, Marcus Robertson 2019 Murray State University

Evaluating Soil Surface Properties In Two Contrasting Tillage Systems, Riley Mabe, Kaeden Mollett, Marcus Robertson

Scholars Week

Soil properties are affected by tillage practices. Tillage practices that provides an adequate growing environment for crops and maintains good soil structure is crucial. The objective of this study was to compare selected soil properties collected from no-till (NT) and conventional tillage (CT) systems in Kentucky, Indiana, and Illinois. Three undisturbed and three disturbed soil samples were taken from the topsoil at the depth of 0 to 7.5 cm. The samples were analyzed for bulk density (BD), water holding capacity (WHC), field capacity (FC), soil pH, soil organic matter (SOM), and compaction. Bulk density, WHC, and FC of the ...


Flood Adulterated Grain - Nutrient Supply To Crops When Land Applied, John E. Sawyer, Antonio Mallarino 2019 Iowa State University

Flood Adulterated Grain - Nutrient Supply To Crops When Land Applied, John E. Sawyer, Antonio Mallarino

Integrated Crop Management News

Flooding has been extensive in several areas of Iowa this spring. In some cases, stored grain has been affected by flood waters. Land application of flood adulterated grain as a nutrient source for a future crop may be an option for some. See the Iowa Dept. of Natural Resources (IDNR) and Iowa Dept. of Agriculture and Land Stewardship (IDALS) publication for Proper Management of Flooded Grain and Hay. That publication states “Farms disposing of spoiled grain and feed on their own property can land apply damaged grain at the following application rates: 146 bu corn/acre and 50 bu soybean ...


Defining, Measuring, And Applying Soil Quality: An Unresolved Debate, Salvador Ramirez II 2019 University of Nebraska - Lincoln

Defining, Measuring, And Applying Soil Quality: An Unresolved Debate, Salvador Ramirez Ii

Doctoral Documents from Doctor of Plant Health Program

Paradigm shifts occur periodically in the sciences. Proposed paradigm shifts offer opportunities to reexamine extant paradigms and evaluate new ones. Soil science experienced a controversy resembling a proposed paradigm shift in the late 1990s and early 2000s when it grappled with the idea of soil quality (SQ). The most contentious points in the SQ debates were (1) the word “quality” itself and designing a functional definition, (2) identifying appropriate soil quality indicators, (3) the integration of soil quality indicators, and (4) the interpretation of soil quality indicators. The latter three disagreements were rooted in the established, fundamental, soil science paradigm ...


Growth And Production Of Hops (Humulus Lupulus) Varieties In The Helena Valley (Mt), Reegan DeBruycker 2019 Carroll College

Growth And Production Of Hops (Humulus Lupulus) Varieties In The Helena Valley (Mt), Reegan Debruycker

Life and Environmental Sciences Undergraduate Theses

Hops (Humulus lupulus) production has been rapidly increasing in the United States due to the rise in popularity of craft beer. The majority of the hops produced in the United States currently originates from Washington due to the ideal climate conditions and historical infrastructure development. In Spring 2017, we planted commercial varieties of hops and measured their growth over the course of the summer before harvesting in early autumn. Additional varieties were planted in Spring 2018. Average aboveground dry biomass and height measurements were gathered for each plant bi-weekly. No significant difference was found for any of the plants in ...


Planting With Seedling Diseases And Low Germination Rates, Daren S. Mueller, Alison E. Robertson, Ethan Stoetzer 2019 Iowa State University

Planting With Seedling Diseases And Low Germination Rates, Daren S. Mueller, Alison E. Robertson, Ethan Stoetzer

Integrated Crop Management News

You know what they say: March comes in like a lion and out like a lamb.

Well, it certainly feels like this past winter was just one extended lion. While there were signs that maybe Iowa would be seeing greener pastures, that has not been the case, especially for farmers who have experienced flooding this past month. With the recent incidents and resulting disaster proclamations, as well as lost grain storage, the idea of farming greener pastures has a long way until fruition.


New Epa-Required Paraquat Training And Additional Use Restrictions, Kristine J. P. Schaefer 2019 Iowa State University

New Epa-Required Paraquat Training And Additional Use Restrictions, Kristine J. P. Schaefer

Integrated Crop Management News

The United States Environmental Protection Agency (EPA) recently announced the requirement and availability of a new certified applicator training module for paraquat dichloride (also known as paraquat). Paraquat is a restricted use pesticide for use only by certified applicators. The restriction applies to mixing, loading, and applying paraquat, as well as other pesticide handling activities. Products that contain paraquat dichloride as an active ingredient may be sold under many different brand names, such as Gramoxone, Cyclone, Helmquat, and Parazone, to name a few. The active ingredient is also used in premix formulations with many other herbicides.


Strategies To Overcome Antagonism Of Quizalofop-P-Ethyl When Applied In Mixture With Other Herbicides, Lucas C. Webster 2019 Louisiana State University

Strategies To Overcome Antagonism Of Quizalofop-P-Ethyl When Applied In Mixture With Other Herbicides, Lucas C. Webster

LSU Master's Theses

A field study was conducted in 2017 and 2018 at the LSU Agricultural Center H. Rouse Caffey Rice Research Station (RRS) near Crowley, LA. to evaluate the influence of different adjuvants in overcoming the antagonism of quizalofop when mixed with bispyribac in Louisiana rice production. The antagonism of quizalofop mixed with bispyribac plus HCOC at 14 DAIT was overcome with a neutral interaction observed at 28 DAIT for barnyardgrass control with an observed control of 91%, compared with an expected control of 97%. The addition of COC, SNS or HCOC into a mixture of quizalofop plus bispyribac provided synergistic or ...


Check Fieldwatch® Before Pesticide Applications, Kristine J. P. Schaefer 2019 Iowa State University

Check Fieldwatch® Before Pesticide Applications, Kristine J. P. Schaefer

Integrated Crop Management News

Prepare for a safe pesticide application season by checking the FieldWatch® registry before making pesticide applications. The FieldWatch® registry is intended to provide easy-to-use, accurate, and secure online tools to enhance communications and awareness between crop producers, beekeepers, and pesticide applicators. FieldWatch® features a voluntary mapping tool through Google Maps™ that shows pesticide applicators the locations of registered sensitive crops and beehives so they can make informed decisions regarding potential pesticide applications. Taking the time to review what is near a field prior to applications helps prevent off-target application problems and helps commercial applicators comply with the Iowa Bee Rule.


Management Considerations For Post Flooding Soils, Mahdi Al-Kaisi 2019 Iowa State University

Management Considerations For Post Flooding Soils, Mahdi Al-Kaisi

Integrated Crop Management News

Farmland in Iowa, western Illinois, and eastern Nebraska is experiencing flooding issues. Planting in these areas may be delayed or may not be planted to any crop in 2019. This can have significant economic and environmental consequences if flooded fields are left barren. Long-term damage to soil needs to be considered when planning for this year’s or next season's crop.


Spring Cover Crop Termination, Meaghan J. B. Anderson, Robert G. Hartzler 2019 Iowa State University

Spring Cover Crop Termination, Meaghan J. B. Anderson, Robert G. Hartzler

Integrated Crop Management News

Spring weather has finally arrived and fieldwork will begin soon. Iowa State University research suggests cereal rye should be terminated at least 10-14 days prior to planting corn, so the favorable weather forecast may allow some farmers to begin terminating overwintered cover crops in the next few weeks.


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