Digital Commons Network^™

Front Matter, Vol. 19 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Variation In Ligule Spotting In Coreopsis Basalis, Edwin B. Smith

Journal of the Arkansas Academy of Science

The ligules of Coreopsis basalis bear an attractive reddish-brown spot at the base. The spot has been used as a taxonomic character of the species. But there is variation within populations at any one time, and within individuals at sequential times, for the size of the spot. A few individuals lack the ligule spot entirely. Variation in average ligule spot size in greenhouse-grown populations of C. basalis and an artificial hybrid is described. Average spot size declines as the blooming season progresses. Some individuals with spotted ligules early in the season bore spotless ligules late in the season. No correlation …

Multi-Use Of The Campus Environment In The Teaching Of Botany, Jewel E. Moore

Journal of the Arkansas Academy of Science

Use of the campus environment in the teaching program is described with special reference to the campus of University of Central Arkansas. Permanent labels identify the campus trees, many of which are representative of native Arkansas trees. A Daylily Display Bed and an Iris Display Bed, both composed of hybrid varieties, are included in the campus design. This organization of the flora of the campus provides a community service as well as an outdoor supplement to the classroom studies in plant science.

Comparative Wood Anatomy Of Malosma And Related Genera (Anacardiaceae), David A. Young

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

Wildlife Habitats In Managed Rangelands-- The Great Basin Of Southeastern Oregon, Wayne Bowers, Bill Hosford, Art Oakley, Carl Bond

United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications

All land management activities on managed rangelands will have some impact(s) on fish habitat; those in the riparian zone will have the greatest impact(s). Native trout populations in the Great Basin of southeastern Oregon exhibit predictable responses to alterations in their habitats; optimum production of native trout is therefore achievable through careful habitat management.

Ua66/1/2 Scrapbook, Wku Ogden College Of Science & Engineering

WKU Administration Documents

Scrapbook of clippings, press releases, photographs and other items related to the history of Ogden College of Science & Technology from 1961 to 1974.

Department Breeds New Oat Variety, Department Of Agriculture, Western Australia

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

XBVT 189, the new oat variety which will be released to selected growers for the 1975 planting, is the product of cross-breed ng, selection and testing work conducted by the plant breeding and crop testing groups of the Department of Agriculture's Wheat and Sheep Division.

Forty Years Of Weeds And Seeds, G R W Meadly

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

The Chief of the Department of Agriculture's Biological Services Division, Mr G. R. W. Meadly, retired on November 12, after more than 40 years with the Department.

Mr Meadly who has an international reputation for his work in weed control and seed certification, was Officer-in-Charge of the Department's Seed Certification and Weed Control Branch from 1950 to early 1972, when he was appointed Chief of the Biological Services Division.

Annual ('Wimmera') Ryegrass Toxicity, Geoffrey A. Pearce, O. M. Goss, P. H. Berry, J. L. Wise

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

Because annual ryegrass is one of the most widespread pasture plants in Western Australia, annual ryegrass toxicity is a threat to livestock in many agricultural areas—even though the area now affected is small.

The problem is being intensively studied by the Department of Agriculture and a working group has been set up to investigate potential control measures.

In this article the group reviews the problem and reports progress in its investigations to the end of 1973.

Skeleton Weed : The 1974 Narembeen Campaign, C R. Chambers

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

Skeleton weed took an alarming, historic turn in Western Australia at the 1974 New Year.

After a decade of an almost complacent pattern—control of one or two small outbreaks annually by the Agriculture Protection Board— general alarm erupted with the discovery of big areas at Pithara and mainly Narembeen.

What followed was a massive movement and engagement of not only Department staff but also the farming community in an attempt to beat this outbreak.

Pasture Seeds : Production Techniques And The Future Market Situation, B J. Quinlivan

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

Like other farming and grazing industries, pasture seed production has its share of booms and slumps —perhaps more than its share. In Western Australia, the industry reached a high point during the mid-1960's when land development along the south and west coastal districts was at its height.

The drought year of 1969 and the subsequent rural depression saw pasture seed production fall to its lowest level for ten years and it is only in the last 12 months that there has been a revival.

With the sudden upsurge of interest last summer there will be many potential seed producers now …

Vascular Plant Family Lauraceae In Arkansas, Gary E. Tucker

Journal of the Arkansas Academy of Science

The family Lauraceae is represented in Arkansas by a total of four species, members of the genera Lindera. Persea and Sassafras. Keys and distribution maps are provided. Lindera melissaefolium is reported from Arkansas for the first time.

New Species Of American Bark Beetles (Scolytidae, Coleoptera), Stephen L. Wood

Brigham Young University Science Bulletin, Biological Series

The following 156 species of American Scolytidae are described as new to science: Cnesinus reticulus (Venezuela), C. beaveri (Brazil), C. teretis (Venezuela), C. alienus (Venezuela), C. deperditus (Colombia), C. fulgens (Venezuela), C. fulgidus (Colombia), C. lucaris (Venezuela), C. triangularis (Colombia), C. brighti (Mexico), C. coracinus (Mexico), Bothrosternus lucidus (Brazil), Hylastes niger (Mexico), Xylechinus mexicanus (Mexico), Phloeotribus nanus (Brazil), Chramesus corniger (Mexico), Ch. disparilis (Mexico), Ch. variabilis (Mexico), Ch. microporosus (Mexico), Ch. aquilus (Mexico), Ch. wisteriae (Mississippi), Ch. marginatus (Mexico), Carphoborus piceae (Oregon), Carphobius cupressi (Guatemala), Cladoctonus atrocis (Brazil), Scolytodes canalis (Mexico), S. costabilis (Mexico), Pseudothysanoes contrarius (Mexico), P. recavus (Mexico), …

Megasporogenesis And Early Embryogeny Of Sanguinaria Canadensis L. (Bloodroot), Stephen R. Foor

Masters Theses

No abstract provided.

The Morphology And Cytology Of Preussia Vulgare (Corda) Cain, Marcial Antonio Pastor-Corrales

Masters Theses

No abstract provided.

Abronia: Ii. Anthocarp Polymorphism And Anatomy For Nine Species Of Abronia Found In California, Ruth C. Wilson

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

Location-Allocation Models For Establishing Facilities, David F. Gibson, John Rodenberg

Aspen Bibliography

Two models and accompanying computer programs are presented which were developed to locate facilities for the timber harvesting industry. Addressed is a case of the facility location-allocation problem. The optimum location and number of landings, facilities to which timber is transshipped, are determined so as to minimize a cost function. This function is composed of the following components: (1) cost of transporting material from its original location to a landing, (2) cost of establishing a landing (facility cost), and (3) cost of transporting material from the landings to some designated point termed the origin. Output of the computer programs is …

Seed Germination In Ginkgo Biloba L. I. Influences Of Cold Treatment, Gibberellic Acid And Red Light, Michael I. Johnson, James L. Wickliff

Journal of the Arkansas Academy of Science

The influences of cold treatment, gibberellic acid and red light treatment on rate of germination of seeds of Ginkgo biloba L. were followed for a 12-wk period. Dispersal units were collected, and the outer fleshy layer was removed soon after harvest. Of water-imbibed, non-cold-treated seeds, 50% of those which germinated did so within 11 wk after planting. A single application of red light accelerated the 50% germination time by 3 wk. Imbibition in GA3 solution did not appear to accelerate germination. With 4-wk cold treatment the 50% germination time was accelerated 6 wk in water-imbibed seeds. Both red light and …

Zinc Nutrition Of Rice Plants As Influenced By Seed Germinated In Zinc Solutions, Narsimaha R. Kasireddy, Lyell F. Thompson

Journal of the Arkansas Academy of Science

In recent years a physiological disorder of rice (Oryza sativa L.) seedlings growing in soils high in exchangeable calcium has been diagnosed as zinc deficiency. Calculations show that less than 30 g of zinc is needed to satisfy the nutrition of a hectare of 6-8-wk-old rice plants. Rice seed was soaked and germinated in dilute solutions of zinc ethylenediamine tetraacetate, zinc sulfate and zinc lignosulfonate prior to planting in greenhouse pots containing a zinc-deficient soil. The rice plants grown from the zinc-treated seed produced more growth and sorbed more zinc than rice plants grown from untreated seed.

The Effect Of Applied Nitrogen And Subterranean Clover On The Growth Of Doublegee, D J. Gilbey

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

Until 20 years ago doublegees in Western Australia were mainly confined to the red-brown earth soils of the wheatbelt.

Since then, they have spread to light loamy sand soils in the wheatbelt, many of which have carried subterranean clover from the mid-1940s onwards.

It has been widely presumed that the spread of doublegees on to the lighter sandy soils of W.A. can be associated with the establishment of subterranean clover on these soils.

This report summarises the results of a glasshouse experiment on the effect of clover and nitrogen on the growth of doublegee.

Tree Ring-Widths In Pinus Ponderosa And Pseudotsuga Menziesii As Indicators Of Past Annual Precipitation, Gerald L. Bliss

All Master's Theses

This paper presents a study designed to determine how well tree ring-widths in Pinus ponderosa and Pseudotsuga menziesii indicate the past annual precipitation in the area of the Rimrock-Tieton Dam, Yakima County, Washington. The study was based on ten trees sampled from a small homogeneous site selected for apparent dryness. A Swedish increment bore was used to extract four cores from each tree. The cores were mounted, dated, measured, and standardized. Linear regression and correlations were used to analyze the data. The results revealed that Pseudotsuga menziesii ring widths are slightly better indicators of the annual precipitation than the ring-widths …

Douglas-Fir Seed Volatile Oils In Seed Detection By Deer Mice, Millard S. Deusen

All Master's Theses

This study investigated the role of the volatile oils of Douglas-fir seeds in olfactory seed detection by deer mice. The removal of these volatile oils from the seed reduces the ability of the deer mice to detect the seeds.

A method is outlined for the removal of the volatile oils from the seeds as well as a method to purify the oils for possible identification and quantification of individual components.

A Comparison Of Two Artificial Substrates In The Determination Of Net Primary Production, Leland C. Faulconer

All Master's Theses

This study was to determine if a significant difference exists between two types of artificial substrates used to measure the growth rate of periphyton in a warm spring. Chlorophyll was used as an indirect measure of biomass in comparing the substrates and estimating net primary production. A semi-quantitative algal survey was done for each of the sites sampled.

The study was carried out for one year and it was demonstrated that there was a statistically significant difference between the two substrates.

A Taxonomic And Distributional Survey Of The Benthic Blue-Green Algal Flora Of The Skokomish River Estuary, Louis J. Boitano

All Master's Theses

This paper presents a taxonomic and distributional survey of the benthic blue-green algal flora within an estuary system. Physical parameters were considered in the seasonal growth and distribution of algal species. A majority of the observed species occur in all habitats of the estuary and are present throughout the year. Seasonal growth rates and distribution are primarily dependent upon light intensity, temperature, salinity, and substrate condition. The largest extent of growth and distribution occurs in the late spring and summer months at which time the abiotic factors are most favorable for the development of benthic algal communities.

Linseed : A Forgotten Crop, M L. Poole, R. J. Guyton, H. M. Fisher

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

Linseed has become a forgotten crop in Western Australia. From a peak production of 6 200 tonnes from 12 500 hectares in 1969, and an apparently bright future, it dwindled to a bare 80 tonnes from 250 hectares in 1973.

This article looks at some of the reasons for this decline and, with linseed fetching all-time record prices on world markets, gives reasons why the crop should be grown.

1974 The Ecology And Control Of Doublegee (Emex Australis) And Emex Spinosa, D J. Gilbey

Experimental Summaries - Plant Research

The objectives of the field experimental programme for 1974 were to - 1) Evaluate a technique to measure pasture loss as a result of doublegee infestation at Merredin, Wongan.Hills and Chapman. 2) Evaluate the effect of cultural and herbicide treatment combinations on the magnitude and distribution of viable doublegee seeds in the soil at Avondale, Merredin, Wongan Hills and Chapman. 3) Measure the magnitude and distribution of viable doublegee seeds in the soil from paddocks representing each year of a two crop, plus three year pastureley rotation at Avondale, Merredin, Wongan Hills and Chapman. 4) Screen herbicides for selective control …

Survival Mechanisms Of Phytopathogenic Bacteria, M. L. Schuster, D. P. Coyne

Department of Plant Pathology: Faculty Publications

Natural habitats usually do not provide bacteria the continuity of agricultural crops. With continuous culture. perpetuation of pathogen is no problem. Although agricul­ tural practices provide some discontinuity between crops. it is less than that in nature. Uniformity of crop germ plasm also favors inoculum buildup and perhaps perpetuation of the pathogens.

End Matter, Vol. 19 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Mississippi Flora. I. Monocotyledon Families With Aquatic Or Wetland Species, Samuel B. Jones Jr.

Gulf and Caribbean Research

Keys, distribution maps, habitats, references, nomenclature, and notes are given for some 16 families of monocotyledons occurring naturally or naturalized in Mississippi. These families all contain one or more species which are found in aquatic or wetland habitats. They are: Alismataceae, Araceae, Cannaceae, Haemodoraceae, Hydrocharitaceae, Juncaginaceae, Lemnaceae, Marantaceae, Mayacaceae, Najadaceae, Pontederiaceae, Potamogetonaceae, Rug piaceae, Sparganiaceae, Typhaceae, Zannichelliaceae.

Short-Term Growth Response To Fertilization In Young Quaking Aspen, Keith Van Cleve

Aspen Bibliography

No abstract provided.