The Manuscript Works Of S. Fred Prince (1857-1951), 2018 University of Dayton
The Manuscript Works Of S. Fred Prince (1857-1951), Sarah Burke Cahalan, Jason W. Dean
Marian Library/IMRI Faculty Publications
S. Fred Prince, a botanical illustrator and amateur scientist, is a largely unknown artist whose work on the American landscape demonstrates his eligibility to be considered in the lineage of self-taught illustrator-naturalists such as Mark Catesby and Genevieve Jones. In this article, we present a survey of extant Prince materials identified at time of writing, describing their contents and physical characteristics. Beyond this survey and description, we also provide a biographical sketch and timeline of Prince's life.
The Effect Of Preflood Nitrogen And Flood Establishment Timing On Rice Development, Nitrogen Uptake And Grain Yield, 2017 University of Arkansas, Fayetteville
The Effect Of Preflood Nitrogen And Flood Establishment Timing On Rice Development, Nitrogen Uptake And Grain Yield, Tyler Richmond
Theses and Dissertations
Urea-N fertilizer is typically applied at the 5-leaf stage to rice (Oryza sativa L.) grown in a dry-seeded, delayed-flood production system. How long the preflood-N can be delayed without adverse effects on yield potential is poorly understood. The research objective was to determine the effects of preflood-N application and flood establishment timing on aboveground-N content, 50% heading, yield components, and grain yield. Trials were established on silt loam soils at the Pine Tree Research Station (PTRS) and Rice Research and Extension Center (RREC) during 2015 and 2016. Urea-N was applied at 0, 45, 90, 135, and 180 kg N ha-1 ...
Shallow Aggregate Ebb-And-Flow System For Greenhouse Lettuce Production, 2017 University of Arkansas, Fayetteville
Shallow Aggregate Ebb-And-Flow System For Greenhouse Lettuce Production, Joseph Chidiac
Theses and Dissertations
A novel soilless technique for the production of lettuce was developed and evaluated for its viability for ornamental greenhouse growers adapting their ebb-and-flood irrigation benching systems to diversify into growing lettuce, without having to purchase the conventional nutrient film technique (NFT) or deep flow technique (DFT) hydroponic systems. The experimental design was a three by four factorial, with three treatments for aggregate depth (19, 38, and 57 mm) and four treatments for irrigation frequency (once every 1, 2, 4, or 8 hours), for a total of twelve treatment combinations. Each treatment was replicated three times in a randomized complete block ...
Productivity And Resistance To Weed Invasion In Four Prairie Biomass Feedstocks With Different Diversity, 2017 University of Northern Iowa
Productivity And Resistance To Weed Invasion In Four Prairie Biomass Feedstocks With Different Diversity, Jessica E. Abernathy, Dustin R. J. Graham, Mark E. Sherrard, Daryl D. Smith
High-diversity mixtures of native tallgrass prairie vegetation should be effective biomass feedstocks because of their high productivity and low input requirements. These diverse mixtures should also enhance several of the ecosystem services provided by the traditional monoculture feedstocks used for bioenergy. In this study, we compared biomass production, year-to-year variation in biomass production, and resistance to weed invasion in four prairie biomass feedstocks with different diversity: one species – a switchgrass monoculture; five species – a mix of C4 grasses; 16 species – a mix of grasses, forbs, and legumes; and 32 species – a mix of grasses, forbs, legumes, and sedges. Each diversity ...
Living Mulch For Sustainable Maize Stover Biomass Harvest, 2017 Iowa State University
Living Mulch For Sustainable Maize Stover Biomass Harvest, Cynthia A. Bartel, Chumki Banik, Andrew W. Lenssen, Kenneth J. Moore, David A. Laird, Sotirios V. Archontoulis, Kendall R. Lamkey
Kendall R Lamkey
The Renewable Fuels Standard mandate provides enhanced opportunity for maize (Zea mays L.) stover use as a bioenergy feedstock. Living mulch (LM) offers a possible solution for the natural resources constraints associated with maize stover biomass harvest. A two site-year study was conducted near Boone and Kanawha, IA, in both maize following maize (MM) and maize following soybean [Glycine max (L.) Merr.] (SM) sequences to evaluate the impact of established and chemically suppressed Kentucky bluegrass (Poa pratensis L.) (KB) ‘Ridgeline’, ‘Wild Horse’, ‘Oasis’, and ‘Mallard’ blend and creeping red fescue (Festuca rubra L.) (CF) ‘Boreal’ as LM on three maize ...
Book Review Of Serendipity: An Ecologist’S Quest To Understand Nature, 2017 Iowa State University
Book Review Of Serendipity: An Ecologist’S Quest To Understand Nature, E. E. Ball, D. M. Adams, J. N. Dupuie Jr., M. M. Jones, P. G. Mcgovern, R. M. Ruden, S. R. Schmidt, G. J. Vaziri, J. S. Eeling, B. D. Kirk, A. L. Mccombs, A. B. Rabinowitz, K. M. Thompson, Z. J. Hudson, Robert W. Klaver
A common thought among graduate students is: “how do established scientists get where they are today?” In Serendipity: An Ecologist’s Quest to Understand Nature, James Estes offers a personal reflection on research experiences spanning his 50-year career, beginning as a Ph.D. student in 1970 and concluding with recognition as a member of the National Academy of Sciences in 2014. Estes chronologically outlines the foundational trophic cascade ecology research that he and colleagues conducted in the Aleutian Islands, examining key relationships among kelp forests, sea otters, sea urchins, and killer whales through anecdotal stories of achievement and challenge. Estes ...
Validation Of A Hairy Roots System To Study Soybean-Soybean Aphid Interactions, 2017 Iowa State University
Validation Of A Hairy Roots System To Study Soybean-Soybean Aphid Interactions, Stephanie C. Morriss, Matthew E. Studham, Gregory L. Tylka, Gustavo C. Macintosh
The soybean aphid (Aphis glycines) is one of the main insect pests of soybean (Glycine max) worldwide. Genomics approaches have provided important data on transcriptome changes, both in the insect and in the plant, in response to the plant-aphid interaction. However, the difficulties to transform soybean and to rear soybean aphid on artificial media have hindered our ability to systematically test the function of genes identified by those analyses as mediators of plant resistance to the insect. An efficient approach to produce transgenic soybean material is the production of transformed hairy roots using Agrobacterium rhizogenes; however, soybean aphids colonize leaves ...
Evaluating The Impact Of Two Contrasting Tillage Practices On Soil Properties In Central Kentucky, 2017 Murray State University
Evaluating The Impact Of Two Contrasting Tillage Practices On Soil Properties In Central Kentucky, Emily Cook
Farming practices such as no tillage and plowing can institute change on soil physical and chemical characteristics. In this research, the effects of long-term conventional and no-tillage systems on the selected soil properties were determined in a continuous corn system on a farm with Maury silt loam soil. These samples were taken from University of Kentucky's Research Farm (Spindletop Farm). The field used was tilled in 1969 from bluegrass sod and the first time research was conduced was in 1970. Each plot is 20 ft. by 40 ft. and for many years each plot was split with winter cover ...
Now’S The Time To Scout For Scn, 2017 Iowa State University
Now’S The Time To Scout For Scn, Greg Tylka
Soybean cyst nematode (SCN) is an important, widespread soybean pest in Iowa that often goes undetected. To date, the nematode has been discovered in all but Adams, Allamakee, Ida, and Lyon counties in Iowa. The only consistent and reliable sign of an SCN infestation in the field during the growing season is the presence of adult SCN females and cysts (dead females) on the roots of infected soybean plants. Adult SCN females and cysts are small, round, and white to yellow, each approximately the size of a period at the end of a sentence.
Fusarium Root Rot Of Soybean—Occurrence, Impact, And Relationship With Soybean Cyst Nematode, 2017 Iowa State University
Fusarium Root Rot Of Soybean—Occurrence, Impact, And Relationship With Soybean Cyst Nematode, Mercedes Diaz Arias, Gregory L. Tylka, Alison Robertson, Leonor Leandro
Fusarium species are ubiquitous soilborne pathogens that can cause devastating and difficult-to-manage damping-off, root rot, wilt, or sudden death syndrome (SDS) in soybeans (Armstrong, 1950; French and Kennedy, 1963; Rupe, 1989). At least 12 different species of Fusarium have been reported to be associated with soybean roots (McGee, 1992); among these species and the diseases they cause, the economic impact is widely recognized only for SDS; economic impacts of Fusarium wilt and root rot are much less well documented. Fusarium root rot is widespread in US (Yang and Feng, 2001). F. oxysporum complex and F. solani complex are generally believed ...
Asian Soybean Rust And Common Soybean Leaf Diseases, 2017 Iowa State University
Asian Soybean Rust And Common Soybean Leaf Diseases, Alison Robertson, Greg Tylka
Asian soybean rust was found in several southern states in November 2004. The fungus is expected to overwinter on weed hosts in southern Florida and the southern tip of Texas. Rust outbreaks in Iowa will depend on the northward seasonal dispersal of rust spores from these overwintering areas.
Corn Nematodes And Soybean Cyst Nematode: Basic Facts And Prospects For 2010, 2017 Iowa State University
Corn Nematodes And Soybean Cyst Nematode: Basic Facts And Prospects For 2010, Gregory L. Tylka
Nematodes are microscopic worms. Many nematode species live in the soil, and some soil-dwelling nematodes feed on plant roots. These plant-parasitic nematodes can cause considerable damage and yield loss when population densities (numbers) become high.
Fall Is Prime Time To Sample Fields For Scn, 2017 Iowa State University
Fall Is Prime Time To Sample Fields For Scn, Greg Tylka
The soybean cyst nematode (SCN) is an extremely damaging and widespread pest of soybean in Iowa. The nematode infests more than 70 percent of the fields statewide. However, SCN usually causes no obvious aboveground symptoms for many years after being introduced into a field. Consequently, many SCN-infested fields in Iowa have not been diagnosed. The lack of symptoms and subsequent missed diagnosis are unfortunate because the key to effective management of SCN is early detection, before large nematode population densities develop. Large nematode population densities can cause severe damage to soybean crops, especially in very dry years, a situation that ...
Soybean Cyst Nematode Will Cause Early Senescence Of Soybeans, 2017 Iowa State University
Soybean Cyst Nematode Will Cause Early Senescence Of Soybeans, Greg Tylka
Soybean cyst nematode is a widespread and serious pest of soybeans in Iowa. But many fields that are infested with the pest go undiagnosed because the nematode often does not cause obvious aboveground symptoms, at least not until population densities become extremely high.
Fall Nematode Sampling Considerations, 2017 Iowa State University
Fall Nematode Sampling Considerations, Greg Tylka
As we near the last part of the growing season, there are a few important pieces of information to remember concerning sampling Iowa fields for plant-parasitic nematodes.
Introduction, 2017 Iowa State University
Introduction, Greg Tylka, David Wright
On behalf of the Iowa Soybean Rust Team, we would like to welcome you to this special Asian soybean rust issue of the Integrated Crop Management Newsletter.
Nematodes That Feed On Corn—What To Make Of It All, 2017 Iowa State University
Nematodes That Feed On Corn—What To Make Of It All, Gregory L. Tylka
Nematodes are microscopic worms that live in soil and water. Many nematode species feed on decaying organic matter, bacteria, fungi, and even other nematodes. But some nematodes, including many that live in the soil, feed on plants and are called plant-parasitic nematodes.
Choosing An Scn-Resistant Soybean Variety: It’S Not Just About Yield, 2017 Iowa State University
Choosing An Scn-Resistant Soybean Variety: It’S Not Just About Yield, Greg Tylka
Resistant soybean varieties are a very effective strategy for managing the soybean cyst nematode (SCN), producing acceptable yields and suppressing reproduction of the nematode. The number of soybean varieties with genetic resistance to SCN in maturity groups I, II, and III has increased dramatically, from a few dozen in the early 1990s to more than 600 currently. Today, most soybean seed companies have SCN-resistant soybean varieties available for Iowa growers, and yield results of soybean variety trials conducted by private testing programs and universities have begun to be released in the past few weeks.
The Increase In Scn Reproduction On Resistant Soybean Varieties—What Does It Mean?, 2017 Iowa State University
The Increase In Scn Reproduction On Resistant Soybean Varieties—What Does It Mean?, Gregory L. Tylka
The soybean cyst nematode (SCN), Heterodera glycines, is a consistent threat to profitable soybean production in the Midwest each year. In years of adequate to excess rainfall, like 2010 in Iowa, the short-term effect of SCN on soybean yields may be reduction of only a few bushels per acre. But in hot, dry years, yield loss can approach 50 percent or more. And no matter the extent of yield loss, SCN population densities (numbers) can increase dramatically during a growing season if susceptible soybean varieties are grown. And high SCN population densities increase the chances of soybean yields being greatly ...
Reverse-Genetic Analysis Of The Two Biotin-Containing Subunit Genes Of The Heteromeric Acetyl-Coenzyme A Carboxylase In Arabidopsis Indicates A Unidirectional Functional Redundancy, 2017 Iowa State University
Reverse-Genetic Analysis Of The Two Biotin-Containing Subunit Genes Of The Heteromeric Acetyl-Coenzyme A Carboxylase In Arabidopsis Indicates A Unidirectional Functional Redundancy, Xu Li, Hilal Ilarslan, Libuse Brachova, Hui-Rong Qian, Ling Li, Ping Che, Eve Syrkin Wurtele, Basil J. Nikolau
The heteromeric acetyl-coenzyme A carboxylase catalyzes the first and committed reaction of de novo fatty acid biosynthesis in plastids. This enzyme is composed of four subunits: biotin carboxyl-carrier protein (BCCP), biotin carboxylase, α-carboxyltransferase, and β-carboxyltransferase. With the exception of BCCP, single-copy genes encode these subunits in Arabidopsis (Arabidopsis thaliana). Reverse-genetic approaches were used to individually investigate the physiological significance of the two paralogous BCCP-coding genes, CAC1A (At5g16390, codes for BCCP1) and CAC1B (At5g15530, codes for BCCP2). Transfer DNA insertional alleles that completely eliminate the accumulation of BCCP2 have no perceptible effect on plant growth, development, and fatty acid accumulation. In ...