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Effect Of Various Crop And Pasture Species On The Growth Of A Subsequent Wheat Crop, N Delroy, J W. Bowden, I Rowland, M Ralph, R Lunt, M Baker

Experimental Summaries - Plant Research

83WH29: The effect of various crop and pasture species on the growth of a subsequent wheat crop. Aim: To characterise the effect of various crop and pasture species on the growth and yield components of a subsequent wheat crop with special emphasis on the nitrogen nutrition of that crop. To provide validation data for modelling wheat growth and nitrogen uptake. Measurements: Factors to be monitored through time were; Soil moisture profiles; Mineral nitrogen profiles; Root growth profiles; Top growth and nitrogen uptake; Development score; Incidence of disease and pests.

Seasonal notes, trial design, weed diseases and pests. Results: The results …

Some Studies On Introducing Castilleja Coccinea, Indian Paintbrush, Into Prairie Vegetation, Robert D. Wright

Journal of the Arkansas Academy of Science

Indian paintbrush, absent from many prairie remnants in Arkansas, behaves as a biennial in certain central Arkansas prairies, growing as a small rosette one season and flowering the next. It is known to be an indiscriminate root parasite. Field sowings were made in October, March and June. Annual change in population size was monitored for one of these sowings. Laboratory studies of germination were conducted to investigate the effects of light, temperature, water potential, and host species. Haustorial connections to host roots were examined. Based on these studies, a strategy for establishing the species in prairie was developed.

Woody Vegetation Of Baber Woods: Composition And Changes Since 1964, James Alvin Newman Jr.

Masters Theses

A comparative study of the woody vegetation changes at Baber Woods, Edgar County, Illinois, since 1964 was completed in 1983. This 51 acre woodlot is a remnant of a much larger forest which once occuppied the Shelbyville Moraine.

An inventory of the woody vegetation shows that the present stand consists of 109 stems per acre with a basal area of 113 sq. ft. per acre. In this survey, 33 woody species were found. Sugar maple had the highest Importance Value (IV) of all woody species present, having the highest density in both the 4-6 and 7-12 inch diameter classes, as …

Vegetative Key To Grasses Of The Sand Hills Region Of Nebraska, David M. Sutherland

Biology Faculty Publications

All illustrated key is provided that will facilitate identification of grasses in the vegetative condition in the Sand Hills region of Nebraska. The key separates 97 species, varieties, and species groups and discusses or partially separates 14 additional taxa. It emphasizes characteristics that may be observed in the field with a hand lens and is illustrated with 109 camera lucida drawings.

Wood Anatomy Of Hydrophyllaceae. Ii. Genera Other Than Eriodictyon, With Comments On Parenchyma Bands Containing Vessels With Large Pits, Sherwin Carlquist, Vincent M. Eckhart

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

Floral Pigments And Nectar Constituents In The Genus Puya (Bromeliaceae), Ron Scogin, C. Edward Freeman

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

Flora And Early Secondary Succession In Wetlands Of The Lower Kanawha River Floodplain, West Virginia, Brenda Kay West

Theses, Dissertations and Capstones

Vegetational and floristic analyses were performed on eight wetlands undergoing early secondary succession on the Kanawha River floodplain of' West Virginia. All sites have been cleared previously and have been revegetated for 30 years or less. Vegetation was classified into ten cover types according to species composition and physiognomy. Aquatic, graminoid dominated wet meadow, shrub-wet meadow, Spiraea tomentosa dominated, Comus amomum dominated, and various early forested wetlands were among the cover types classified and surveyed. Frequency, density, dominance, and importance values were established with random plot sampling for both herbaceous and woody species. A total of 262 species distributed among …

Growth Analysis Based On Degree Days, M. P. Russelle, Wallace Wilhelm, R. A. Olson, James F. Power

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Comparisons of growth analysis functions within and among experiments are often confounded by sources of variation other than those imposed by treatment. we suggest use of a temperature index, such as modified growing degree days, as the divisor in growth functions to facilitate treatment comparisons within certain experiments and to reduce the effects of differing temperature regimes among experiments on these comparisons. Three experiments were identified to provide data to analyze this new approach. Mean absolute growth rate (GR) and mean relative growth rate (RGR) were compared in two experiments with maize (Zea mays L.) conducted in eastern Nebraska. …

Endocrine Mechanisms Of Puberty In Heifers: Estradiol Negative Feedback Regulation Of Luteinizing Hormone Secretion, M. L. Day, K. Imakawa, M. Garcia-Winder, D. D. Zalesky, B. D. Schanbacher, Roger J. Kittok, J. E. Kinder

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The hypothesis that luteinizing hormone (LH) secretion in prepubertal females is responsive to estradiol negative feedback and that decreased feedback occurs as puberty approaches was tested in heifers. In the first experiment, seven heifers were maintained prepubertal by dietary energy restriction until 508 days of age (Day 0). All heifers were placed on a high-energy diet on Day 0 at which time they received no additional treatment (CONT), were ovariectomized (OVX) or were ovariectomized and subcutaneously implanted with estradiol-17β (OVX-E₂). This feeding regimen was used to synchronize reproductive state in all heifers. A second experiment was performed with …

Two Purified Rnas Of Soil-Borne Wheat Mosaic Virus Are Needed For Infection, Yukio Shirako, Myron K. Brakke

Department of Plant Pathology: Faculty Publications

RNAs of soil-borne wheat mosaic virus (SBWMV) from virions 281 nm, 138 nm and 92 nm long (designated here by relative lengths as 1∙0L, 0∙SL and 0∙35L, respectively), were isolated and purified by three cycles of sucrose density gradient centrifugation. Infectivity assays with these RNAs proved the bipartite nature of SBWMV, the combination of 1∙0L and either 0∙5L or 0∙35L RNAs being required for infection and for multiplication of progeny viruses. The 0∙5L RNA underwent deletion mutation, producing smaller variants with various sizes, of which 0∙4L and 0∙35L RNAs were confirmed to be functional in combination with 1∙0L RNA. The …

Lentinus Edodes Colonization Of Oak Is Enhanced By Log Treatment With Methyl Bromide, Elmer L. Schmidt

Journal of the Minnesota Academy of Science

Two or more years of outdoor incubation of inoculated oak logs are required before shiitake (Lentinus edodes [Berk.] Sing.) mushrooms appear; methods to accelerate the rate of oak sapwood colonization should reduce this incubation period. Observed increased mold growth of oak sapwood fumigated with methyl bromide (MB) prompted an experiment to determine whether such treatment would enhance oak colonization by L. edodes. Red and bur oak bolts ( 1 m long) were inoculated three weeks after felling. Half of the bolts were fumigated with MB ( 100 g per m3 of space beneath a plastic tarp) for three days, then …

A Floristic Study Of Ramsey's Draft Wilderness Area, Augusta County, Virginia, W. Wilton Fansler Iii

Theses, Dissertations and Capstones

A total of 255 species of vascular plants, representing 70 families, was recorded from nine physiographic community types at Rarnsey's Draft Wilderness Area, Augusta County, Virginia. No single species occurred in more than seven communities. One hundred and sixty-eight species (65.9%) were restricted to a single community; 14 species encountered were previously unknown to Augusta County. Floristic similarity coefficients of nine communities ranged from .500 to 0.000, with the Picnic Area and Lower Natural Area communities having no taxa in coornon. Geographically, the flora of Ramsey's Draft Wilderness Area is representative of the flora of the five physiographic regions of …

Effects Of Castration And Electrical Stimulation On Beef Carcass Quality And Palatability Characteristics, S. Kalstrup, H. R. Cross, B. D. Schanbacher, R. W. Mandigo

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Thirty bull and 30 heifer Hereford x Simmental calves were weaned at approximately 5 mo of age and assigned randomly to one of the following treatments: intact, conventionally castrated or luteinizing hormone-releasing hormone-immunized (LHRH). All animals were slaughtered at 16 mo of age and the right side of each carcass was electrically stimulated (ES) or restimulated (RES). Yield and quality grades were determined on both right and left sides after 24 h chilling. Longissimus muscles (LD) were obtained at 7 d postmortem for objective color measurements, chemical analysis, shear force and trained sensory panel evaluation. Semitendinosus muscles (ST) were also …

Seasonal Shifts Of Photosynthesis In Portulacaria Afra (L.) Jacq., Lonnie J. Guralnick, Patricia A. Rorabaugh, Zac Hanscom

Arts & Sciences Faculty Publications

Portulacaria afra (L.) Jacq., a perennial facultative Crassulacean acid metabolism (CAM) species, was studied under natural photoperiods and temperatures in San Diego, California. The plants were irrigated every fourth day throughout the study period. Measurements of ¹⁴CO₂ uptake, stomatal resistance, and titratable acidity were made periodically from July 1981 through May 1982. P. afra maintained C₃ photosynthesis during the winter and the spring. Diurnal acid fluctuations were low and maximal ¹⁴CO₂ uptake occurred during the day. The day/night ratio of carbon uptake varied from 5 to 10 and indicated little nocturnal CO₂ uptake. CAM …

Guralnick Lj, Pa Rorabaugh, Z Hanscom (1984) Influence Of Photoperiod And Leaf Age On Crassulacean Acid Metabolism In Portulacaria Afra (L.) Jacq., Lonnie J. Guralnick, Patricia A. Rorabaugh, Zac Hanscom

Arts & Sciences Faculty Publications

No abstract provided.

A 'Natural Herbicide' Against Calotrope?, A H. Cheam

Journal of the Department of Agriculture, Western Australia, Series 4

Buffel grass produces a chemical compound which is toxic to the growth of calotrope seedlings, a declared weed in Western Austrsalia north of the 26th parallel. This new discovery id highly significant in view of the increasing emphasis now placed on weed management as opposed to weed control and the desire to use fewer pesticides.

Research On Declared Plants And Other Weeds, G. A. Pearce

Journal of the Department of Agriculture, Western Australia, Series 4

Knowledge about weeds is necessary to assess their significance, devise control measures and to select those which are to be declared for the purposes of the Agricultural and Related Resources Protection Act.

Once a plant has been declared in Western Australia, all landowners must control and prevent its spread to new areas and work towards eradicating known infestations. The Act also declares plants which are prohibited from entering the State.

It is becoming more and more important to provide specific reasons for the declaration of a weed and its placement in a certain category. Such decisions require appropriate action to …

Nitrogen Flows From Several Species And Varieties Of Legume, John Hamblin Dr

Experimental Summaries - Plant Research

Trial 83C24: N flows from several species and varieties of legume.

Trial 83C27: The effect of seeding rate, planting and variety on the residual value of lupins.

Trial 84C25: Small rotation trial for 1985.

Trial 84C34: Nitrogen response on large rotation plots at ECRS.

These trials were carried out in collaboration with: Mr R. Delane, and with assistance from: Mr. T. White, Ms. A. Bishop.

Investigation Of Root And Foliar Diseases Associated With Decline In Wheat Yields On Sandplain, Jill Wilson

Experimental Summaries - Plant Research

A Wheat Industry Research Council Project. In 1984 research was conducted in collaboration with Dr John Hamblin, Dr Allan Brown, Mr Rob Delane and Dr Mark Sweetingham. 1. Field Trial (GE84Cl5): Interactions between disease and agronomic factors, particularly rotation with lupins, and deep tillage. ( i) Yields, (ii) Incidence of root diseases, (iii) Root length and diseased root length, (iv) Leaf disease. 2. Farm Survey (sites from trial 84GE57 of Dr Allan Brown) Incidence of Common Root Rot

Mutations, The Abberant Ratio Phenomenon, And Virus Infection Of Maize, Myron K. Brakke

Department of Plant Pathology: Faculty Publications

Viruses interact genetically in various ways with bacterial and animal hosts, e.g. by lysogeny in bacteriophage and by incorporating a DNA copy of retrovirus RNA into the host genome. These phenomena lead to mutations, to the transfer of host genes by viruses, and to latent viruses being transmitted from generation to generation essentially as host genes. In contrast, there are no known examples of the incorporation of viral genomes into plant DNA.

Spontaneous Deletion Mutation Of Soil-Borne Wheat Mosaic Virus Rna Ii, Yukio Shirako, Myron K. Brakke

Department of Plant Pathology: Faculty Publications

The wild-type (WT) isolate of soil-borne wheat mosaic virus has two species of rodshaped virions 281 nm and 138 nm in length, which are designated as virions 1∙0L and 0∙5L, respectively. We reported previously that virions shorter than 0∙5L arose in assay plants inoculated with separated and recombined 1∙0L RNA and 0∙5L RNA and suggested that these short virions were caused by deletion mutation of 0∙5L RNA. We now report that these short virions arose after a period of several months in wheat plants that had been inoculated manually with unpurified WT isolate, and also when plants infected naturally in …

Notes: Differences Among Nematode Populations In Tall Fescue Pastures In North, Central, And South Alabama, Jeffrey F. Pedersen, R. Rodriguez-Kabana

Department of Agronomy and Horticulture: Faculty Publications

Surveys of nematode populations in tall fescue (Festuca arundinacea Schreb.) pastures in north, central, and south Alabama in 1982 and 1983 showed significant differences in frequency of occurrence of many nematode species by geographical region. Although nematode damage has been implicated in the poor adaptation of tall fescue to the sandy soils of the extreme Southeast, many plant parasitic nematode species occurred in low frequency in south Alabama pastures. There were significant differences in the frequency of occurrence of Paratrichodorus christiei (Allen) Siddiqi by region. This nematode occurred with relatively high frequency in south Alabama in both years. There were …

Inflorescence Architecture And Evolution In The Fagaceae, Robert B. Kaul, Ernst C. Abbe

School of Biological Sciences: Faculty Publications

First paragraph:

Inflorescence architecture is receiving increasing attention with respect to its role in the life of plants, but much remains to be learned of its effects on pollination and dispersal biology (see Wyatt, 1982). Little is known of the biology of fagaceous inflorescences or of their relationships with the growth or the reproductive patterns of the trees. Most studies (Abbe, 1974; Macdonald, 1979; Fey & Endress, 1983) have concentrated on the nature of the flower clusters (often called dichasia or partial inflorescences) and cupules. Hjelmqvist (1948) and Soepadmo (1972) briefly reviewed the variety of inflorescences in the Fagaceae. Čelakovský …

Manipulation Of Endogenous And Exogenous Hormones For Red Meat Production, Bruce D. Schanbacher

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Growth and development of domestic livestock for red meat production are often discussed in the context of environmental factors, nutritional requirements, genetic potential and the anabolic agents affecting production efficiency. In this minireview, the effects of endogenous and exogenous hormones on animal growth are reviewed. The pituitary, pancreatic and gonadal hormones known to affect growth and(or) carcass composition are cited to illustrate and place into perspective the important contributions that the endocrine system makes to animal production. Manipulation of endogenous hormones through 1) administration of synthetic releasing and inhibiting peptides and 2) immunoneutralization techniques, will likely provide the livestock producer …

Pituitary-Testicular Responses Of Estradiol-17Β-Implanted Bull Calves To Continuous Versus Pulsatile Infusion Of Luteinizing Hormone Releasing Hormone, Bruce D. Schanbacher

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The luteinizing hormone (LH), folliclestimulating hormone (FSH) and testosterone response of bull calves implanted with estradiol-17β to continuous and pulsatile infusion of luteinizing hormone releasing hormone (LHRH) has been examined. Estradiol-17β reduced serum LH and FSH concentrations and suppressed testosterone secretion and testicular growth when compared with sham-implanted bulls. Putsatile iv infusion of LHRH [500 ng every 2 h (6 μg/d)] for a 4-wk period to estradiol-17β- implanted bulls resulted in elevated mean serum LH and testosterone concentrations that were characterized by discrete secretory episodes. Mean serum FSH was also increased by LHRH pulse infusion, but LHRH-coup!ed secretory episodes were …

Curatorial News From The University Of Richmond Herbarium, W. John Hayden

Biology Faculty Publications

The Department of Biology at the University of Richmond maintains a herbarium of approximately 15,000 specimens. In an effort to make this collection better known to Virginia botanists, this note describes some recent curatorial improvements upon the UR Herbarium and outlines its contents.

Systematics And Palynology Of Picrodendron Further Evidence For Relationship With The Oldfieldioideae (Euphorbiaceae), W. John Hayden, W. T. Gillis, D. E. Stone, C. R. Broome, G. L. Webster

Biology Faculty Publications

Although known to botanical science for 285 years, the genus Picrodendron Planchon has been poorly understood for most of this time. The most pervasive problem has been that of discerning familial relationships, and there have been additional difficulties in typifying the generic name (Hayden & Reveal, 1980) and in distinguishing its three nominate species. This paper provides a systematic treatment for Picrodendron and demonstrates its relationships with Euphorbiaceae subfam. Oldfieldioideae Kohler & Webster as evidenced by data on gross morphology, palynology, anatomy, and cytology.

Juglans Cinerea: The American White Walnut, Dennis Robert Hattermann

Masters Theses

The American white walnut Juglans cinerea L. is a native North American tree in the Juglandaceae, or walnut family. It prefers rich, moist, rather neutral to slightly basic lowland soils. This is an in depth study of its taxonomy, morphology, anatomy, age, size, growth habit, distribution, ecology, propagation, economic importance, medicinal uses, toxicity, folklore, diseases and pests, and chemical constituents.

J. cinerea L. is monoecious and confined in its distribution to the eastern and central parts of North America. It can be easily identified by its large, pinnately compound leaves and ashy-gray bark with broad, flat plates and deep furrows. …

Radiological Monitoring Of Select Faunal Species Indigenous To Environs Of The Maxey Flats Shallow Land Burial Facility, Robert Bruce Burns

Morehead State Theses and Dissertations

A Thesis presented to the faculty of the School of Sciences and Mathematics at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science in Biology by Robert Bruce Burns on December 14, 1983.

The Plant Information Network (Pin) Data Base: Colorado, Montana, North Dakota, Utah, And Wyoming, United States Department Of The Interior, Fish And Wildlife Service

Plants

This publication provides introductory information on the Plant Information Network (PIN) and a print-out of PIN data. The PIN was a computerized data base containing information on native and naturalized vascular plants of five Western States. Information was included on over 5,000 species found in Colordo, Montana, North Dakota, Utah, and Wyoming. Because of funding restrictions PIN is no longer operated as a computerized data base. This publication makes the PIN data available to resource managers, planners, and others who have a continuing need for this information.

Approximately 500 descriptors were included in the data base for each species. These …