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- Arkansas (2)
- Herbicides (2)
- Rice (2)
- ANOVA – analysis of variance; LSD – least significant difference (1)
- Attenuated Total Reflectance-Fourier Transform Infrared (1)
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- Blastoderm (1)
- Carbonate Adsorption (1)
- Chloroplast DNA (1)
- Corn; Growing degree-days; Timing of biological processes; Crop simulation model (1)
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- Historical increase in yield (1)
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- Infrared (1)
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- Population genetics (1)
- RAPDs (1)
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- United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications (11)
- Arkansas Agricultural Experiment Station Research Series (3)
- Department of Agronomy and Horticulture: Faculty Publications (3)
- INTSORMIL Impacts and Bulletins (1)
- Southern Soybean Disease Workers: Conference Proceedings (1)
Articles 1 - 19 of 19
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Field Evaluation Of Herbicides On Small Fruit, Vegetable, And Ornamental Crops, 1996, Ron Talbert, Lance A. Schmidt, Nilda R. Burgos, Jennifer A. Johnson, Joe K. Curless, Jason K. Norsworthy
Field Evaluation Of Herbicides On Small Fruit, Vegetable, And Ornamental Crops, 1996, Ron Talbert, Lance A. Schmidt, Nilda R. Burgos, Jennifer A. Johnson, Joe K. Curless, Jason K. Norsworthy
Arkansas Agricultural Experiment Station Research Series
No abstract provided.
Growing Degree-Days: One Equation, Two Interpretations, Gregory S. Mcmaster, Wallace Wilhelm
Growing Degree-Days: One Equation, Two Interpretations, Gregory S. Mcmaster, Wallace Wilhelm
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Heat units, expressed in growing degree-days (GDD), are frequently used to describe the timing of biological processes. The basic equation used is GDD = [(TMAX + TMIN)/2] - TBASE where TMAX and TMIN are daily maximum and minimum air temperature, respectively, and TBASE is the base temperature. Two methods of interpreting this equation for calculating GDD are: (1) if the daily mean temperature is less than the base, it is set equal to the base temperature, or (2) if TMAX or TMIN < TBASE they are reset equal to T …
Herbicide Evaluation In Arkansas Rice, 1996, Eric Webster, Ron Talbert, Ford Baldwin, David Gealy, Tomilea Dillon, Jason Norsworthy, Lance Schmidt, Dwayne Beaty
Herbicide Evaluation In Arkansas Rice, 1996, Eric Webster, Ron Talbert, Ford Baldwin, David Gealy, Tomilea Dillon, Jason Norsworthy, Lance Schmidt, Dwayne Beaty
Arkansas Agricultural Experiment Station Research Series
No abstract provided.
Conservation Compliance Credit For Winter Wheat Fall Biomass Production And Implications For Grain Yield, Gregory S. Mcmaster, Wallace Wilhelm
Conservation Compliance Credit For Winter Wheat Fall Biomass Production And Implications For Grain Yield, Gregory S. Mcmaster, Wallace Wilhelm
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Producers participating in federal farm and conservation programs must reduce potential erodibility below certain thresholds on lands classified as highly erodible. The Natural Resource Conservation Service (NRCS) will credit producer s in Colorado for the quantity of green winter wheat (Triticum aestivum L.) biomass at the beginning of the winter period towards compliance in reducing erosion. Unfortunately, few data exist on fall winter wheat biomass production and fall production varies widely based on many site-specific factors at planting and during the fall, and can be expensive to document. To address these problems, a crop simulation model called SHOOTGRO …
B.R. Wells Rice Research Studies 1996, R. J. Norman, T. H. Johnston
B.R. Wells Rice Research Studies 1996, R. J. Norman, T. H. Johnston
Arkansas Agricultural Experiment Station Research Series
No abstract provided.
Proceedings Of The Global Conference On Ergot Of Sorghum, Carlos R. Casela, Jeffery A. Dahlberg
Proceedings Of The Global Conference On Ergot Of Sorghum, Carlos R. Casela, Jeffery A. Dahlberg
INTSORMIL Impacts and Bulletins
In June 1996, several of us had the opportunity to see sorghum ergot in Brazil and the damage that the disease can do. We saw severe damage in seed production plots and witnessed the pain that seed producers had to go through to deal with this new problem. There was a wide spread scare in the sorghum community in the Americas because of the infamous reputation of the disease in causing damage in seed production fields. As a silver lining, we also observed first hand, the excellent research program that the Brazilians had in place. It became apparent that all …
Pathogenicity Of Escherichia Coli O157:H7 In The Intestines Of Neonatal Calves, Evelyn A. Dean-Nystrom, Brad T. Bosworth, William C. Cray Jr., Harley W. Moon
Pathogenicity Of Escherichia Coli O157:H7 In The Intestines Of Neonatal Calves, Evelyn A. Dean-Nystrom, Brad T. Bosworth, William C. Cray Jr., Harley W. Moon
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Cattle are an important reservoir of Shiga toxin-producing enterohemorrhagic Escherichia coli (EHEC) O157:H7 strains, foodborne pathogens that cause hemorrhagic colitis and hemolytic uremic syndrome in humans. EHEC O157:H7 strains are not pathogenic in calves >3 weeks old. Our objective was to determine if EHEC O157:H7 strains are pathogenic in neonatal calves. Calves(A/E) lesions in both the large and small intestines by 18 h postinoculation. The severity of diarrhea and inflammation, and also the frequency and extent of A/E lesions, increased by 3 days postinoculation. We conclude that EHEC O157:H7 strains are pathogenic in neonatal calves. The neonatal calf model is …
Proceedings Of The 24th Annual Meeting, Southern Soybean Disease Workers (March 15-16, 1997, Fort Walton Beach, Florida), Robert P. Mulrooney, Gabe Sciumbato, Steve Koenning, John Russin, Glenn G. Hammes
Proceedings Of The 24th Annual Meeting, Southern Soybean Disease Workers (March 15-16, 1997, Fort Walton Beach, Florida), Robert P. Mulrooney, Gabe Sciumbato, Steve Koenning, John Russin, Glenn G. Hammes
Southern Soybean Disease Workers: Conference Proceedings
Contents
Business session
Soybean Disease Loss Estimate for the Southern United States during 1996. Compiled by PW Pratt
Treasurer report. GG Hammes
SSDW Committee chairmen for 1996-1997
Graduate student papers
Characterization of Races of Phytophthora sojae in Arkansas and Their Effects on Commonly Grown Cultivars. TA Jackson, TL Kirkpatrick, and JC Rupe
Induction of Defense Related Proteins During Compatible and Incompatible Soybean-Cercospora sojina Interactions. WA Baker, J Qiu, CB Lawrence, S Tuzun, and DB Weaver
Contributed papers
Performance and Cyst Nematode Resistance of Selected Soybean Cultivars in North Carolina Production Fields. SR Koenning and KR Barker
Distribution and Diversity …
Selenium Speciation Of Soil/ Sediment Determined With Sequential Extractions And Hydride Generation Atomic Absorption Spectrophotometry, Dean A. Martens, Donald L. Suarez
Selenium Speciation Of Soil/ Sediment Determined With Sequential Extractions And Hydride Generation Atomic Absorption Spectrophotometry, Dean A. Martens, Donald L. Suarez
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Understanding the speciation of the multioxidation states of selenium is vital to predicting the mineralization, mobilization, and toxicity of the trace element in natural systems. Asequential extraction scheme (SES) was developed for identification of Se oxidation states that first employed 0.1 M (pH 7.0) K2HPO4-KH2PO4 (P-buffer) to release soluble selenate (Se+VI) and selenide (Se-II) and ligand-exchangeable selenite (Se+IV). The second step involved oxidation of organic materials with 0.1 M K2S2O8 (90 °C) to release Se-II and Se+IV associated or occluded …
Comparative Development Of The Turkey And Chicken Embryo From Cleavage Through Hypoblast Formation, M. R. Bakst, S. K. Gupta, V. Akuffo
Comparative Development Of The Turkey And Chicken Embryo From Cleavage Through Hypoblast Formation, M. R. Bakst, S. K. Gupta, V. Akuffo
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
The development of the turkey and chicken embryo from the first cleavage division through hypoblast formation is described. The early development of the chicken embryo has been categorized into 14 stages. A similar staging sequence for the turkey was not proposed until 1993, when we described the early development of the turkey embryo, which was divided into 11 stages. Comparatively, differences in the temporal and spatial development of the turkey and chicken blastoderm were evident. Of significance is the observation that at oviposition the turkey is in Stage VII and characterized by the first signs of area pellucida formation. In …
Evaluation Of 41 Elite And Exotic Inbred Sorghum Genotypes For High Quality Callus Production, Heidi F. Kaeppler, Jeffrey F. Pedersen
Evaluation Of 41 Elite And Exotic Inbred Sorghum Genotypes For High Quality Callus Production, Heidi F. Kaeppler, Jeffrey F. Pedersen
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Interest is high in the genetic study and improvement of sorghum(Sorghum bicolor L. Moench), a crop of worldwide agronomic importance. The ability to initiate and maintain high quality (pigmentless, mucilage-free, fast growing, type II) callus cultures from a variety of sorghum genotypes is important for certain tissue culture-based genetic studies. The objective of this study was to identify high-quality callus-producing genotypes from a group of 41 diverse inbred sorghum lines. Callus cultures of 20 elite inbred sorghum genotypes and 21 inbred genotypes of exotic background were initiated from immature inflorescences. The cultures were subjected to several cycles of subculturing …
Expression Of Follistatin And Inhibin/Activin Subunit Genes In Porcine Follicles, M.D. Li, L.V. Depaolo, J.J. Ford
Expression Of Follistatin And Inhibin/Activin Subunit Genes In Porcine Follicles, M.D. Li, L.V. Depaolo, J.J. Ford
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Expression of the follistatin (FS) and inhibin/activin (I/A) α, βA, and βB subunit genes in porcine ovarian follicles was evaluated by reverse transcriptase polymerase chain reaction and/or RNase protection procedures to establish changes during the final stages of follicular development. For the I/A α and βA subunits, expression increased (p < 0.05) as follicles progressed to the mid-stage of the follicular phase. The βB, subunit was expressed in lower concentrations, and all three I/A subunits showed a marked reduction (p < 0.01) in expression by the late stage of follicular development. In contrast to this pattern, FS gene expression decreased (p < 0.05) as follicles developed from the early (low estradiol) to the mid stage (high estradiol) and continued to decline in advanced follicles (after estrus). The predominant mRNA encoded for FS-315, and the ratio of mRNA for FS-315 to mRNA for FS-288 did not differ significantly during the three stages. Within an animal, concentration of FS mRNAs was related more to stage of the follicular phase than to follicular size. Follicular fluid concentration of FS changed in a manner similar to that observed for expression of its gene. We conclude that expression of the FS gene and translation of its mRNA decrease as follicles approach ovulatory status.
Effects On White Leghorn Hens Of Constant Exposure To Ultraviolet Light From Insect Traps, Jerome Hogsette, Henry Wilson, Susan Semple-Rowland
Effects On White Leghorn Hens Of Constant Exposure To Ultraviolet Light From Insect Traps, Jerome Hogsette, Henry Wilson, Susan Semple-Rowland
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Constant exposure of Hy-Line® W-36 White Leghorn hens to ultraviolet light from insect traps resulted in no significant differences in egg production, fertility, hatchability of fertile eggs, or total hatchability. Also, there were no apparent effects on the eyes of the birds. Results were the same when either blacklight or blacklight blue tubes were used. The need for additional testing of light traps for nuisance fly control in commercial caged layer houses is discussed.
Genetic Variation In North American Leafy Spurge (Euphorbia Esula) Determined By Dna Markers, Martha L. Rowe, Donald J. Lee, Scott Nissen, Brunella M. Bowditch, Robert A. Masters
Genetic Variation In North American Leafy Spurge (Euphorbia Esula) Determined By Dna Markers, Martha L. Rowe, Donald J. Lee, Scott Nissen, Brunella M. Bowditch, Robert A. Masters
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Levels of inter- and intrapopulation genetic variation were determined in five North American populations of leafy spurge using chloroplast DNA (cpDNA) RFLPs and RAPD markers. Thirteen plastome types were identified among 123 individuals collected from five geographically separated populations. Number of pastimes within a population ranged from one to seven, with four of the populations having a predominate type plus one or more rarer types. Some plastome types were shared by populations, but plastome distribution among populations was nonrandom. RAPD markers indicated greatest relatedness among individuals within a population. Relatedness among populations as established through RAPDs was greater for geographically …
Yield Of Wheat Across A Subambient Carbon Dioxide Gradient, Herman S. Mayeux, Hyrum B. Johnson, H. Wayne Polley, Stephen R. Malone
Yield Of Wheat Across A Subambient Carbon Dioxide Gradient, Herman S. Mayeux, Hyrum B. Johnson, H. Wayne Polley, Stephen R. Malone
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Yields and yield components of two cultivars of day-neutral spring wheat (Triticum aestivum L.) were assessed along a gradient of daytime carbon dioxide (CO2) concentrations from about 200 to near 350 µmol CO2 (mol air)–1 in a 38 m-long controlled environment chamber. The range in CO2 concentration studied approximates that of Earth’s atmosphere since the last ice age. This 75% rise in CO2 concentration increased grain yields more than 200% under well-watered conditions and by 80–150% when wheat was grown without additions of water during the last half of the 100-day growing season. …
In Situ Infrared Speciation Of Adsorbed Carbonate On Aluminum And Iron Oxides, Chunming Su, Donald L. Suarez
In Situ Infrared Speciation Of Adsorbed Carbonate On Aluminum And Iron Oxides, Chunming Su, Donald L. Suarez
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Surface adsorption mechanisms of dissolved inorganic carbon species on soil minerals are not well understood. Traditional infrared (IR) study of adsorbed species of inorganic carbon using air-dried samples may not reveal true species in the solid/water interface in suspension. The purpose of this study was to obtain information on interracial carbonate speciation between solid and aqueous phases. The interaction of bicarbonate and carbonate ions with X-ray amorphous (am) A1 and Fe oxides, gibbsite (y-Al(OH)3 ) and goethite ( α-FeOOH) was examined by electrophoresis and in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. The presence of …
Notes: Forage Yield, Quality, And Fertility Of Sorghum X Sudan Grass Hybrids In A1 And A3 Cytoplasm, Jeffrey F. Pedersen, J. J. Toy
Notes: Forage Yield, Quality, And Fertility Of Sorghum X Sudan Grass Hybrids In A1 And A3 Cytoplasm, Jeffrey F. Pedersen, J. J. Toy
Department of Agronomy and Horticulture: Faculty Publications
Currently, no information is available comparing the agronomic performance of A1 and A3 cytoplasms in sorghum x sudangrass [Sorghumbi color (L.) Moench] hybrids. The objectives of this study were to compare the effects of A1 and A3 cytoplasm on the maturity, fertility, height, forage yield, and forage quality of sorghum × sudangrass hybrids. In 1989, pollen from a bulk of eight sudangrass populations was used to pollinate four sorghum lines that had been male-sterilized in both A1 and A3 cytoplasm. Hybrids were grown at the Univ. of Nebraska Field Laboratory Ithaca, NE, in 1990 and 1991, in a split-plot …
Molecular And Functional Characterization Of A Novel Low-Affinity Cation Transporter (Lct1) In Higher Plants, Daniel P. Schachtman, Raman Kumar, Julian I. Schroeder, Ellen L. Marsh
Molecular And Functional Characterization Of A Novel Low-Affinity Cation Transporter (Lct1) In Higher Plants, Daniel P. Schachtman, Raman Kumar, Julian I. Schroeder, Ellen L. Marsh
Department of Agronomy and Horticulture: Faculty Publications
The transport of cations across membranes in higher plants plays an essential role in many physiological processes including mineral nutrition, cell expansion, and the transduction of environmental signals. In higher plants the coordinated expression of transport mechanisms is essential for specialized cellular processes and for adaptation to variable environmental conditions. To understand the molecular basis of cation transport in plant roots, a Triticum aestivum cDNA library was used to complement a yeast mutant deficient in potassium (K+) uptake. Two genes were cloned that complemented the mutant: HKT1 and a novel cDNA described in this report encoding a cation …
Soil Temperature And Fumigation Effects On Plant Phosphorus Uptake And Related Microbial Properties, Dennis L. Mccallister, L. A. Jawson, M. D. Jawson
Soil Temperature And Fumigation Effects On Plant Phosphorus Uptake And Related Microbial Properties, Dennis L. Mccallister, L. A. Jawson, M. D. Jawson
Department of Agronomy and Horticulture: Faculty Publications
Early season problems with growth of corn (Zea mays L.) under cool, wet conditions prompted a study of the effects of soil and environmental conditions on mineralization and plant uptake of phosphorus (P). Our objective was to determine the effect of soil test P, temperature, and soil fumigation on soil P availability and uptake during early corn growth. Corn was grown in growth chambers at temperatures of 14°C or 25°C. Soils were a high-P Hastings silty clay loam (fine, montmorillonitic, mesic Udic Argiustoll) and a low-P Sharpsburg clay loam (fine, montmorillonitic, mesic Typic Argiudoll). Plants grew for up to …