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Full-Text Articles in Weed Science

The Prairie Naturalist, Volume 51, No. 1 Jun 2019

The Prairie Naturalist, Volume 51, No. 1

The Prairie Naturalist

1 EDITOR’S NOTE

RESEARCH ARTICLES

3 Factors Affecting White Bass Abundance in Two Missouri River Reservoirs, William J. Radigan and Mark J. Fincel

17 Suitability of single-pass backpack electrofishing to estimate fish abundance and describe assemblage structure in prairie streams, Morgan J. Kauth, David A. Schumann, Katie N. B. Graeb, and W. Wyatt Hoback

NOTES

25 Channel Catfish Reproductive Traits in the Lower Platte River, Nebraska, USA - Mackenzie Zwiener, Jonathan Spurgeon, & Mark Pegg

30 Quantifying Signpost Usage By Captive Male White-Tailed Deer - Cassie L. Auxt, Eric S. Michel, and Jonathan A. Jenks.

33 Incidental Captures of Plains …


Channel Catfish Reproductive Traits In The Lower Platte River, Nebraska, Usa, Mackenzie Zwiener, Jonathan J. Spurgeon, Mark Pegg Jun 2019

Channel Catfish Reproductive Traits In The Lower Platte River, Nebraska, Usa, Mackenzie Zwiener, Jonathan J. Spurgeon, Mark Pegg

The Prairie Naturalist

Reproductive traits including fecundity, egg diameter, and condition of freshwater fishes influence offspring survival and abundance and may provide insight regarding timing of reproduction (Winemiller and Rose 1992, Johnston and Leggett 2002). Fish size (i.e., length or weight) may influence the number of eggs produced by an individual female (i.e., fecundity; Michaletz 1998). Larger individuals may, thus, disproportionately contribute to year-classes through increased fecundity if egg and larval survival is similar or greater than those from smaller reproductive females (Gwinn et al. 2015). Likewise, maternal fish size may influence egg diameter and offspring survival, whereby larger egg diameters are associated …


Considerations For Nisc’S Future Without Isac, Invasive Species Advisory Committee May 2019

Considerations For Nisc’S Future Without Isac, Invasive Species Advisory Committee

National Invasive Species Council

The Invasive Species Advisory Committee (ISAC) was established in 1999 by Executive Order 131121 and furthered by Executive Order 137512 to provide consultation, feedback, information on particular issues, and expert advice generally for consideration by the National Invasive Species Council (NISC). ISAC is composed of distinguished, experienced volunteers from various organizations that are appointed to serve on the Committee by the Secretary of the Interior. Their task is to develop assessments on many aspects of the invasive species issue in the United States and to provide recommendations for the management, control, and response to key invasive species as articulated in …


Review Of Birds Of Prey Of The West: A Field Guide, By Brian K. Wheeler, Daniel Casey May 2019

Review Of Birds Of Prey Of The West: A Field Guide, By Brian K. Wheeler, Daniel Casey

The Prairie Naturalist

Birds of prey epitomize much of what attracts us to birding. Many are large and easy to observe, particularly in open landscapes. Their predatory nature and behavior give them an added aura of wildness; their migrations can be spectacular. And even veteran birders should enjoy the challenge of identifying the myriad of plumage variations shown by different ages, sexes, subspecies, and color morphs. With his newest effort, Birds of Prey of the West, Brian Wheeler has compiled a comprehensive and enhanced field guide with illustrations that stunningly capture that variation, combined with enough additional context to make it a valuable …


Science Communication In Agriculture: The Role Of The Trusted Adviser, Lee Galen Briese May 2019

Science Communication In Agriculture: The Role Of The Trusted Adviser, Lee Galen Briese

Doctor of Plant Health Program: Dissertations and Student Research

Agronomy is not simply the selling of agricultural products to farmers, nor is it the process of solving singular production problems. Agronomy is defined as the integrated, holistic perspective of agriculture (ASA, 2019) and “agronomists are specialists in crop and soil sciences, as well as ecology” (ASA, 2019). While scientific investigation and discovery are essential to understanding systems function, the tangible benefits from our knowledge stems from the application to solve problems. Clear communication is vital to successfully help stakeholders understand the importance of the science and help scientists understand the challenges stakeholders face. However, to successfully put science into …


Integrated Management Of Phytophthora Stem And Root Rot Of Soybean And The Effect Of Soil-Applied Herbicides On Seedling Disease Incidence, Vinicius Castelli Garnica May 2019

Integrated Management Of Phytophthora Stem And Root Rot Of Soybean And The Effect Of Soil-Applied Herbicides On Seedling Disease Incidence, Vinicius Castelli Garnica

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Soybean seedling diseases and Phytophthora stem and root rot (PSRR; caused by Phytophthora sojae) are two of the most economically important diseases in North Central U.S. Remarkable differences in disease incidence occur each year, which demonstrate that abiotic and biotic factors must interact for disease onset and development. During 2017 and 2018, field studies were conducted to (i) address the efficacy of seed treatment and genetic resistance for PSRR management on soybean population, canopy coverage (CC), and yield, and (ii) investigate potential interactions between pre-emergence (PRE) herbicides and the incidence of seedling diseases in alluvial soils in Nebraska.

Despite …


Review Of Carnivores Of The World, Second Edition, By Luke Hunter, Shannon M. Barber-Meyer May 2019

Review Of Carnivores Of The World, Second Edition, By Luke Hunter, Shannon M. Barber-Meyer

The Prairie Naturalist

Cracking open this fully revised field guide invites a new appreciation for the diversity of carnivores (members of the order Carnivora) in the world. Dig a little deeper and you’ll uncover just how little we know about so many of them. This second edition of the Carnivores of the World features 250 mammalian species—from a species so tiny it can squeeze through a wedding ring to one weighing thousands of times more, the polar bear (Ursus maritimus). Each detailed species account includes an illustration of the species (and sometimes varying forms or subspecies), information on morphological and identifying features, distribution …


Effect Of Soil-Applied Protoporphyrinogen Oxidase Inhibitor Herbicides On Soybean Seedling Disease, Nicholas J. Arneson May 2019

Effect Of Soil-Applied Protoporphyrinogen Oxidase Inhibitor Herbicides On Soybean Seedling Disease, Nicholas J. Arneson

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Seedling disease is one the most economically important diseases of soybean in the United States. It is commonly caused by Fusarium spp., Rhizoctonia solani, Pythium spp., and Phytophthora sojae, alone, or together as a disease complex. Fungicide seed treatments continue to provide the most consistent management of seedling diseases. Soil-applied protoporphyrinogen oxidase (PPO) inhibitor herbicides are used preemergence in soybean production to manage several broadleaf weeds. Applications of PPO-inhibitors can result in phytotoxic injury to soybean when environmental conditions are not favorable for soybean growth. These environmental conditions can favor seedling disease development as well. In this thesis, two …


Quantifying Signpost Usage By Captive Male White-Tailed Deer, Cassie L. Auxt, Eric S. Michel, Jonathan A. Jenks Jan 2019

Quantifying Signpost Usage By Captive Male White-Tailed Deer, Cassie L. Auxt, Eric S. Michel, Jonathan A. Jenks

The Prairie Naturalist

White-tailed deer (Odocoileus virginianus) use rubbing of signpost structures to communicate during the breeding season. Rubbing of signpost structures allows deer to communicate via visual and chemical cues, which allows them to establish dominance hierarchies and maintain hierarchal status throughout the breeding season (Moore and Marchinton 1974, Miller et al. 1981, Hewitt 2011). Once a living tree is rubbed, the exposed light-colored sapwood creates a stark contrast in wooded areas, increasing visibility and further enticing deer to investigate the structure (Oehler et al. 1995). Anatomically, the tubular apocrine sudoriferous glands of white-tailed deer are located at the antler …


Past Invasive Species Advisory Committee (Isac) Members, National Invasive Species Committee Jan 2019

Past Invasive Species Advisory Committee (Isac) Members, National Invasive Species Committee

National Invasive Species Council

United States Department of the Interior

National Invasive Species Council

Invasive Species Advisory Committee (ISAC)

Past ISAC Members:

Class 9 (2016-2019)

Class 8 (2011-2016/2017)

Class 7 (2011-2012/2014)

Class 6 (2009-2011/2012)

Class 5 (2008/2009-2010)

Class 4 (2006-2008)

Class 3 (2004-2006)

Class 2 (2002-2004)

Class 1 (1999-2001)


Review: Canids Of The World: Wolves, Wild Dogs, Foxes, Jackals, Coyotes, And Their Relatives. José R. Castelló., Jonathan (Jon) Way Dec 2018

Review: Canids Of The World: Wolves, Wild Dogs, Foxes, Jackals, Coyotes, And Their Relatives. José R. Castelló., Jonathan (Jon) Way

The Prairie Naturalist

Canids of the World is one of those reads where just when you think that something cannot be beat, this book comes out. What I mean by that is that I have read many works on wolves and other canids, most recently Nate Blakeslee’s American Wolf (Way 2017), and I have enjoyed and been enthralled with many of them. But Canids of the World may take the cake for being the most impressive book available on canids. For a modest price of just under $30.00, you can own a book that has over 600 amazing high-resolution glossy photographs of every …


New Breeding Record And Location For Wilson’S Phalarope (Phalaropus Tricolor) In The Nebraska Great Plains, Usa, Madison O. Sutton, Nico Arcilla Dec 2018

New Breeding Record And Location For Wilson’S Phalarope (Phalaropus Tricolor) In The Nebraska Great Plains, Usa, Madison O. Sutton, Nico Arcilla

The Prairie Naturalist

Wilson’s phalarope (Phalaropus tricolor; Scolopacidae) is a migratory shorebird that relies on interior wetlands for foraging and breeding (Colwell and Jehl 1994, van Gils et al. 2018). Its global population status is unclear (Colwell and Jehl 1994, Lesterhuis and Clay 2010), and is variously listed as declining (Morrison et al. 2006, van Gils et al. 2018), increasing (Andres 2009, BirdLife International 2018), and exhibiting a long-term decline but recent stability (Sauer et al. 2011, Andres et al. 2012). Its global population estimate of 1.5 million birds has not been updated for 30 years, since 1988 (Colwell and Jehl 1994, Lesterhuis …


Review: Behavior Of The Golden Eagle: An Illustrated Ethogram. David H. Ellis (Illustrated By N. John Schmitt)., Jeremy E. Guinn Dec 2018

Review: Behavior Of The Golden Eagle: An Illustrated Ethogram. David H. Ellis (Illustrated By N. John Schmitt)., Jeremy E. Guinn

The Prairie Naturalist

Author David H. Ellis and illustrator N. John Schmitt deliver precisely what is promised in Behavior of the Golden Eagle: An Illustrated Ethogram. This “little volume,” as the author coins it, represents a single source for defining, identifying, and describing behaviors of the Golden Eagle (Aquila chrysaetos). With the inclusion of Schmitt’s exceptional drawings, the book is a piece of art, as well as the most useful manual describing Golden Eagle behaviors. Nearly four decades earlier, Ellis (1979) authored the very first Golden Eagle ethogram—the set of repeated standard behaviors for a species called action patterns—and in his new book, …


Review: Edges And Rushes Of Minnesota: The Complete Guide To Species Identification, Welby R. Smith; Photography By Richard Haug, Edward S. Dekeyser Dec 2018

Review: Edges And Rushes Of Minnesota: The Complete Guide To Species Identification, Welby R. Smith; Photography By Richard Haug, Edward S. Dekeyser

The Prairie Naturalist

Even the most seasoned individual with a plant identification background can relate to the difficulty of identifying sedges and rushes to the species level. Historically, one has had to rely on dichotomous keys to identify a sedge or rush species in the field. After hours of frustration, a person ends up collecting the plant and, if lucky, bringing the collection back to a herbarium where it can be compared to known specimens. I have been collecting and identifying sedge and rush species for over 25 years, and author Welby Smith along with photographer Richard Haug have published what I believe …


Red-Bellied Snake (Storeria Occipitomaculata) Copulation In South Dakota, Drew R. Davis Dec 2018

Red-Bellied Snake (Storeria Occipitomaculata) Copulation In South Dakota, Drew R. Davis

The Prairie Naturalist

Storeria occipitomaculata is a small, terrestrial species of snake that occurs across much of eastern North America (Ernst and Barbour 1989, Ernst 2002, Ernst and Ernst 2003). Due to this widespread distribution, S. occipitomaculata faces varied climates that likely result in regional differences in reproductive phenology. Much of what is known about the reproductive ecology of S. occipitomaculata has been documented from the southeastern portion of its range in North America (South Carolina: Semlitsch and Moran 1984, North Carolina: Willson and Dorcas 2004), though Blanchard (1937) studied a population from northern Michigan. The exact reproductive timing in this …


Review: North American Ducks, Geese & Swans: Identification Guide. Frank S. Todd., Kevin M. Ringelman Dec 2018

Review: North American Ducks, Geese & Swans: Identification Guide. Frank S. Todd., Kevin M. Ringelman

The Prairie Naturalist

The North American Duck, Geese & Swans: Identification Guide, released in 2018, is the culmination of a lifetime of waterfowl photography by the late Frank Todd. Indeed, this book stands apart from other identification guides as being entirely photo-driven, with minimal introductory material, notations of field marks, or descriptions of the various waterfowl species. It is small enough to be carried in the field (6.5” × 9” × 0.5”), but most readers will find it less useful than a standard bird identification book (Sibley 2014), even for waterfowl. As the title suggests, the Todd guide focuses on North American species, …


Preparing An Effective Poster Presentation, Christopher N. Jacques Dec 2018

Preparing An Effective Poster Presentation, Christopher N. Jacques

The Prairie Naturalist

Greetings GPNSS members! By the time you read this editorial, many of have been experiencing the fury unleashed by ‘Old Man Winter’ and may find yourself counting the days until warmer spring temperatures return once again to the Great Plains. Until then, just a couple more months of bitter cold temperatures, strong winds, and blowing and drifting snow. But not to worry, winter also provides the cold weather enthusiasts among us a chance to enjoy a range of outdoor recreational opportunities, a chance to reflect on the previous year in review, exciting professional and personal opportunities ushered in by the …


Notes: Two-Headed White-Tailed Deer Fetus, William F. Jensen, Daniel M. Grove, Ryan J. Herigstad, William J. Haase Dec 2018

Notes: Two-Headed White-Tailed Deer Fetus, William F. Jensen, Daniel M. Grove, Ryan J. Herigstad, William J. Haase

The Prairie Naturalist

On 6 April 2018 a female white-tailed deer (Odocoileus virginianus dakotensis) was hit and killed by a vehicle along HWY 1806 in rural Morton County, North Dakota, USA (N46o 38.617; W100o 42.901). Based upon dental eruption and wear (Severinghaus 1949), the female was estimated to be a >4.5 years-of-age. A male fetus with parapagus diprosopus (i.e., shared face) apparently was expelled from the adult female, and a domestic canine (Canis lupus familiaris) carried the fetus to a private residence. The resident contacted the North Dakota Game and Fish Department (NDGFD) to turn in the fetus. On 10 April 2018, NDGFD …


Metabolic Gas Emissions From Prairie Soil Containing Foraging Termites, Charles E. Konemann, B.M. Kard, Tom A. Royer, Mark E. Payton Dec 2018

Metabolic Gas Emissions From Prairie Soil Containing Foraging Termites, Charles E. Konemann, B.M. Kard, Tom A. Royer, Mark E. Payton

The Prairie Naturalist

Differences in subterranean termite metabolic gas emissions are readily observed in laboratory experiments. However, in natural field ecosystems a primary difficulty in measuring subterranean termite gases is non-homogeneous distribution of foraging termites in soil. Our field experiment was designed to aggregate foragers of the 'eastern subterranean termite', Reticulitermes flavipes Kollar (EST), in one of four flux chamber configurations placed on a tallgrass prairie throughout 2014 and 2015. We used differently configured flux chambers to measure metabolic gas emissions from soil with or without foraging termites on The Joseph H. Williams Tallgrass Prairie Preserve (TGPP) in north-central Oklahoma. Foraging termitesaggregated in …


The Prairie Naturalist: The Journal Of The Great Plains Natural Science Society Volume 50 No. 2 Dec 2018

The Prairie Naturalist: The Journal Of The Great Plains Natural Science Society Volume 50 No. 2

The Prairie Naturalist

TABLE OF CONTENTS

43 EDITOR’S NOTE

RESEARCH ARTICLES

46 Metabolic Gas Emissions from Prairie Soil Containing Foraging Termites Charles E. Konemann, B. M. Kard, Tom A. Royer, and Mark. E. Payton

59 Comparison of northern flying and red squirrel phylogenies with focus on the insular United States Alyssa M. Kiesow, and Hugh B. Britten

NOTES

70 Two-Headed White-Tailed Deer Fetus

72 Red-Bellied Snake (Storeria occipitomacilata) Copulation in South Dakota

74 New Breeding Record and Location for Wilson's Phalarope (Phalaropus tricolor) in the Nebraska Great Plains, USA

BOOK REVIEWS

76 Sedges and Rushes of Minnesota: The Complete Guide to Species Identification. …


Comparison Of Northern Flying And Red Squirrel Phylogenies With Focus On The Insular United States, Alyssa M. Kiesow, Hugh B. Britten Dec 2018

Comparison Of Northern Flying And Red Squirrel Phylogenies With Focus On The Insular United States, Alyssa M. Kiesow, Hugh B. Britten

The Prairie Naturalist

Northern flying squirrel (Glaucomys sabrinus) and red squirrel (Tamiasciurus hudsonicus) populations are endemic to northern North America, including the Black Hills. The Black Hills populations are considered disjunct from other populations within their range. We examined insular populations to determine whether arboreal squirrels in the Black Hills each represent a unique population. We trapped and collected ear samples from northern flying and red squirrels in the Black Hills and in areas of Montana, Wyoming, Idaho, Utah, Minnesota, and Wisconsin to infer population phylogenies with special consideration of the Black Hills population. Microsatellite loci and two mtDNA sequences were used for …


Lekking Behavior Of A Sharp-Tailed Grouse In South-Central Nebraska, Kelsey C. King, Andrew J. Caven, Keith Geluso Jun 2018

Lekking Behavior Of A Sharp-Tailed Grouse In South-Central Nebraska, Kelsey C. King, Andrew J. Caven, Keith Geluso

The Prairie Naturalist

Sharp-tailed grouse (Tympanuchus phasianellus; STGR) occur throughout much of the northern Great Plains, and historically were suspected to have ranged as far south as Kansas (Connelly et al. 1998). Sharp-tailed grouse were the dominant grouse in Nebraska 200 years ago, but early settlers and their associated agricultural practices extirpated STGR from much of their former range, including Kansas and southern Nebraska (Sisson 1976, Johnsgard 2016). During the period of initial land conversion, the greater prairie-chicken (T. cupido; GRPC) filled the void, benefiting from small plots of cropland providing winter forage, and outcompeting the STGR (Johnsgard and Wood 1968, Svedarsky et …


The Prairie Naturalist: The Journal Of The Great Plains Natural Science Society Volume 50 No. 1 Jun 2018

The Prairie Naturalist: The Journal Of The Great Plains Natural Science Society Volume 50 No. 1

The Prairie Naturalist

TABLE OF CONTENTS

1 EDITOR’S NOTE

RESEARCH ARTICLES

3 Spatiotemporal Distribution of Waterfowl Disease Outbreaks in Kansas, USA Thomas A. Becker, Adam A. Ahlers, Shane Hesting, and David A. Haukos

14 Wild Turkey Occupancy in a Prairie Landscape Joshua C. Courlas and R. Scott Lutz

24 Age and Growth of Cottonwood Trees along the Missouri River, North Dakota Jonathan M. Friedman, Fisher R. Ankeny, and Marshall Wolf

NOTES

34 Hoary Bat Impaled on Barbed Wire Fence

37 Lekking Behavior of a Sharp-Tailed Grouse in South-Central Nebraska

BOOK REVIEWS

40 Force of Nature: George Fell, Founder of The Natural Areas Movement. …


Age And Growth Of Cottonwood Trees Along The Missouri River, North Dakota, Jonathan M. Friedman, Fisher R. Ankney, J. Marshall Wolf Jun 2018

Age And Growth Of Cottonwood Trees Along The Missouri River, North Dakota, Jonathan M. Friedman, Fisher R. Ankney, J. Marshall Wolf

The Prairie Naturalist

The relict plains cottonwood (Populus deltoides subsp. monilifera) forest along the Missouri River between Lakes Sakakawea and Oahe includes trees as large as two meters in diameter. We cored 24 of these trees to determine their age and suitability for flow reconstruction. Because most of the trees were rotten in the center, we developed a method to estimate the date of the center ring that accounts for the increase in ring width toward the center. Estimated center ring dates were as early as 1806. Cottonwood growth at a dry site was correlated with April–August flow prior to construction of Lake …


Wild Turkey Occupancy In A Prairie Landscape, Joshua C. Courlas, R. Scott Lutz Jun 2018

Wild Turkey Occupancy In A Prairie Landscape, Joshua C. Courlas, R. Scott Lutz

The Prairie Naturalist

We investigated wild turkey (Meleagris gallopavo) distribution in prairie landscapes in North Dakota using occupancy modeling in two stages. In 2012, we extensively surveyed ecoregions across the state and in 2013, intensively surveyed the ecoregion with the highest probability of occupancy. Occupancy models from the statewide survey indicated wild turkeys were sparse in ecoregions with primarily agricultural landscapes, were found associated with wooded riparian cover, and found most frequently in the Missouri River Plateau ecoregion. In the Missouri River Plateau, our occupancy models identified that an additive model including mean patch area of cropland fields and spatial aggregation of forest …


Spatiotemporal Distribution Of Waterfowl Disease Outbreaks In Kansas, Usa, Thomas A. Becker, Adam A. Ahlers, Shane Hesting, David A. Haukos Jun 2018

Spatiotemporal Distribution Of Waterfowl Disease Outbreaks In Kansas, Usa, Thomas A. Becker, Adam A. Ahlers, Shane Hesting, David A. Haukos

The Prairie Naturalist

Causes and impacts of disease outbreaks in wild bird populations are rarely studied beyond documentation of large epizootic events. In Kansas, USA, a central disease surveillance and reporting protocol currently does not exist within the Kansas Department of Wildlife, Parks and Tourism, which has led to a lack of available knowledge of disease occurrences that could be used to predict and manage future outbreaks. We compiled historic records of documented waterbird disease outbreaks in Kansas from 1967–2014 and related the frequency of outbreaks with light geese (Ross’s goose [Anser rossii]; Snow goose [A. caerulescens]) populations from 1970–2014. We found 32 …


Book Reviews: Force Of Nature: George Fell, Founder Of The Natural Areas Movement. Arthur Melville Pearson., James R. Herkert Jun 2018

Book Reviews: Force Of Nature: George Fell, Founder Of The Natural Areas Movement. Arthur Melville Pearson., James R. Herkert

The Prairie Naturalist

Arthur Melville Pearson’s Force of Nature is a book that tells two very interesting and intertwined stories. One is a story of how perseverance and determination can drive an individual to accomplish great things. And the other is a story of how the modern day natural areas movement came to be. Fortunately for those interested in conservation and natural areas protection, those two stories were combined in the life of George Fell (1916-1994). In Fell’s home state of Illinois, where his impact is widely known, his name is synonymous with conservation. In other places where his impact is less well …


A Short Narrative For Writing For The Prairie Naturalist, Christopher N. Jacques Jun 2018

A Short Narrative For Writing For The Prairie Naturalist, Christopher N. Jacques

The Prairie Naturalist

The abstract should be written upon completion of the paper. A well-written abstract is a single short (≤1 line/page of text), concise, and includes 1) an introductory sentence justifying why the study was conducted, 2) a statement of the principal objectives or hypotheses tested during the study, 3) a brief description of pertinent methods, 4) a summary of significant results, 5) a punchy conclusion, and 6) management implications (i.e., utility of results explaining how, when, where, and by whom data or interpretations can be applied; Krausman and Cox 2017). Keep in mind that abstracts are read more than authors than …


Nitrogen And Weed Management In Transplanted Tomato In The Nigerian Forest-Savanna Transition Zone, J. A. Adigun, O. S. Daramola, O. R. Adeyemi, P. M. Olorunmaiye, O. A. Osipitan May 2018

Nitrogen And Weed Management In Transplanted Tomato In The Nigerian Forest-Savanna Transition Zone, J. A. Adigun, O. S. Daramola, O. R. Adeyemi, P. M. Olorunmaiye, O. A. Osipitan

Haskell Agricultural Laboratory (Northeast Research and Extension Center)

Weed infestation and inherent low soil fertility are among primary reasons for low yields of tomato in Nigeria. Field trials were carried out during the wet season of 2015 and 2016 to evaluate yield response of tomato to nitrogen (N) application and weed control methods in the forest-savanna transition zone of Abeokuta, Nigeria. Positive relationship exists between growth of weed species and increase in N application. Across the years of study, increase in N up to 90 kg/ha increased weed density by 11–25%, however, the increased N gave the transplanted tomato competitive advantage and thus enhanced weed smothering. Pre-transplant application …


Influence Of Multispecies Interference Of Common Ragweed (Ambrosia Artemisiifolia L.) And Common Waterhemp (Amaranthus Rudis Sauer) On Soybean [Glycine Max (L.) Merr.] Growth And Yield Under Variable Water Supply In Nebraska, Koffi Badou Jeremie Kouame May 2018

Influence Of Multispecies Interference Of Common Ragweed (Ambrosia Artemisiifolia L.) And Common Waterhemp (Amaranthus Rudis Sauer) On Soybean [Glycine Max (L.) Merr.] Growth And Yield Under Variable Water Supply In Nebraska, Koffi Badou Jeremie Kouame

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Common ragweed (Ambrosia artemisiifolia L.) and common waterhemp (Amaranthus rudis Sauer) are two problematic weeds for soybean producers in the United States. Both weeds have evolved resistance to many herbicides, including glyphosate. It is therefore essential to understand how these weeds in mixture impact soybean growth and yield and also how they deplete soil moisture in rainfed and irrigated cropping systems. The objectives of this research were to: (i) understand the influence of variable water supply on soybean yield loss in mixture with ragweed and waterhemp, (ii) quantify the influence of variable water supply on soybean growth in …