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Jefferson County, Fairbury Area, Conservation And Survey Division

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Nebraska's Water Supply Map Including Groundwater In Storage, Total Water Withdrawals, Precipitation, And Outflow As Of 1969

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

New Members Of The Gering Formation (Miocene) In Western Nebraska, Including A Geological Map Of Wildcat Ridge And Related Outliers, Carl F. Vondra, C. Bertrand Schultz, Thompson M. Stout

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Late Middle Ordovician Graptolites From The Subsurface Of Eastern Nebraska, M. P. Carlson, W. B.N. Berry

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Subject Index For Physiological Aspects Of Crop Yield

Department of Agronomy and Horticulture: Faculty Publications

Subject Index
8 pages
Anatomy [to] Yield, requirement

Life Cycle Studies With Musk Thistle, M. K. Mccarty, C. J. Scifres

Nebraska Agricultural Experiment Station: Historical Research Bulletins

Musk thistle (Carduus nutans L.) was added to the Nebraska noxious weed list in 1959. The objectives of this study were: (a) to determine the normal life cycle of musk thistle in Nebraska; (b) to determine the variations from the normal life cycle of musk thistle; and (c) to furnish a summary of the phenology for musk thistle in southeastern Nebraska. Observations are used freely throughout the text to describe morphological variations occurring within musk thistle that are not easily quantified.

Metabolic Sinks, Harry Beevers

Department of Agronomy and Horticulture: Faculty Publications

The continued growth of higher green plants well supplied with water and inorganic nutrients depends primarily on (i) the accomplishment of photosynthesis in the leaves and (ii) the transport of organic compounds from the leaves to heterotrophic cells which constitute metabolic sinks.

Productivity And The Morphology Of Crop Stands: Patterns With Leaves, R. S. Loomis, W. A. Williams

Department of Agronomy and Horticulture: Faculty Publications

The primary productivity of communities made up of autotrophic green plants I initially dependent upon photosynthesis. The patterns of chlorophyll display at each level of community organization revel features which can be related to light interception and photosynthetic activity, and hence, to production. Studies on the comparative morphology of such displays should reveal principles useful for designing more efficient crops. It is important that we identify these principles since existing patterns are not necessarily the most efficient for intensive agriculture – a consequence of natural selection, even under a strong influence of man, having occurred principally in poverty environments and …

Nebraska Soil Association Map, 1969, Conservation And Survey Division

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

The Publication Of Apuleius' Apology, Thomas Nelson Winter

Department of Classics and Religious Studies: Faculty Publications

How did the text of Apuleius' Apology originate? The question has seldom drawn the attention of scholars. Those who have dealt with it simply assume that Apuleius worked out and elaborated upon whatever he had actually said in court and then had the finished version published. Paul Vallette thus assumes Apuleius must have reworked the speech. Adam Abt is so confident that the Apology was improved and augmented that he attempts to determine which sections would have been added for publication. Georg Misch writes: "He brilliantly defended himself ... and he then published a long and lively version of his …

Nebraska Groundwater Level (Decline & Rise), 1969

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Total Number Of Irrigation Wells Located In Nebraska Counties As Of 1969

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Ground Water Atlas Of Nebraska (June 1969), V. H. Dreeszen, J. A. Elder, E. C. Weakly, E. C. Reed, G. R. Svoboda

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Managerial Analysis Of Doctoral Candidates And Professors: Research Attitudes And Interpersonal Relations, Fred Luthans, Richard M. Hodgetts

Department of Management: Faculty Publications

The authors feel that managerial analysis can contribute to the better understanding of many problems facing the modern university. This study, in analyzing the staffing problems of colleges of business administration, utilizes the research attitudes and interpersonal relations between doctoral candidates and their professors. The body of management knowledge is usually associated with business organizations. However, many other types of organizations in modern society have utilized management knowledge to solve their problems. Government organizations, hospitals, and the military draw from and add to the general body of management knowledge.

Gaseous Exchange In Crop Stands, Edgar Lemon

Department of Agronomy and Horticulture: Faculty Publications

Man through the ages has evolved a strategy, albeit empirical, of manipulating the environment and the plant to his advantage. Practices such as fertilizing the soil, irrigation, weed control, and plant breeding and selection are common. Nonetheless, concentrated and coordinated efforts to understand the mechanisms controlling the whole soil-plant- atmosphere continuum is a new approach to finding new ways to favorably manipulate the whole system as well as predict response.
Conceptually and experimentally it has proven advantageous to view the total system in terms of energy, momentum, and mass exchange. This makes sense because in the first instance the foundations …

Light Interception And Radiative Exchange In Crop Stands, John Monteith

Department of Agronomy and Horticulture: Faculty Publications

Crops grow and use water because they intercept radiation from the sun, the .sky, and the atmosphere. Diurnal changes of solar radiation dictate the diurnal course of photosynthesis and transpiration, and the vertical gradient of radiant flux in a canopy is a measure of the absorption of energy by foliage at different heights. Without exaggeration, the distribution of radiation within a plant community is the most important single element of microclimate.
Early ecological studies of radiation climate were mainly descriptive and were limited in scope by rather primitive instrumentation. A new quantitative approach to the subject was initiated by Monsi …

Physiological Significance Of Internal Water Relations To Crop Yield, R. O. Slatyer

Department of Agronomy and Horticulture: Faculty Publications

The overall effects of water deficits on crop yield are known to everybody. Moderate water deficiencies can result in stunting, distorted development, and much reduced crop yields, and prolonged drought can cause complete crop failure.
Despite these visible symptoms of deficiency, a clear and unambiguous statement as to the effect of deficits on crop yield is difficult to make, for a variety of reasons. Firstly, despite the importance of the phenomenon to agriculture in most of the food producing countries of the world, relatively little attention has been devoted to its water deficits. Secondly, and in part this is a …

Physiological Aspects Of Crop Yield (Frontmatter), Jerry D. Easton, Francis A. Haskins, C. Y. Sullivan, C. H. M. Van Bavel

Department of Agronomy and Horticulture: Faculty Publications

Foreword
Preface
Contributors
Contents

This volume is the outgrowth of an international symposium held at Lincoln, Nebraska, January 20-24, 1969. It was sponsored by the University of Nebraska in cooperation with the American Society of Agronomy and the Crop Science Society of America with partial financing by the Rockefeller Foundation and the International Biological Program.
The symposium planning committee was broadly based and was able to bring specialists from many parts of the world to the conference. Thus, the technical presentations were drawn from outstanding authorities backed up by a clear perspective of social needs. This was a happy combination …

Germ Plasm Manipulations Of The Future, George Sprague

Department of Agronomy and Horticulture: Faculty Publications

The topic, Germ Plasm Manipulations of the Future, could cover the entire field of genetics. This would be a very difficult assignment and, were I willing to attempt it, one that might not best serve the specific purpose of this symposium. I shall take a much more restrictive view and consider only certain phases of genetics which, in my opinion, will become of increasing importance in crop improvement.
In the period since 1900 genetics has achieved close and reciprocally productive relations with several fields of science. A partial listing of these would include genetics and cytology to yield cytogenetics; genetics …

Environmental Manipulation For Higher Yields, Paul Waggoner

Department of Agronomy and Horticulture: Faculty Publications

My role in this chapter on environmental manipulations is making a prediction that can be used until experiments render the final verdict.
In chapters preceding mine, an array of physical and physiological phenomena for affecting yield has been laid before the grower of plants. Predicting whether environmental manipulation will increase yield requires that all of these phenomena be considered for foreign lands are littered with the bleaching bones of immigrant varieties and practices that were ambushed by an unsuspected environmental difference.
Interaction is the Scylla of biologic prediction. Formerly we predicted by drawing a curve or writing a formula relating …

Cultural Manipulation For Higher Yields, William Duncan

Department of Agronomy and Horticulture: Faculty Publications

By cultural manipulation we will mean, in a broad sense, everything a farmer might do to increase crop yields per hectare, after he decides what to plant and buys the seed. With this restriction we leave out the agricultural economist and the plant breeder. When we limit our interest to yields per hectare we introduce an element of area. This will include the crop canopy above the surface and the root system below it. Cultural manipulation also includes what the farmer might do to make best use of water, carbon dioxide, nitrogen, and essential mineral nutrients whether they occur naturally …

Development, Differentiation, And Yield, John Heslop-Harrison

Department of Agronomy and Horticulture: Faculty Publications

The task of reviewing some of the ways development and differentiation may act as determinants of economic yield would be much simpler had knowledge advanced to a point where the basic principles concerned in the control of these processes in eukaryotic organisms were clear. Unfortunately, this stage has not yet been reached. There is no shortage of schemes and hypotheses to set beside a mountain of observational and experimental data, but the unifying thread which might allow us to pick out the significant and reject the irrelevant in any particular context is still lacking. What is incontestable is that development …

Plant Morphology And Stand Geometry In Relation To Nitrogen, Robert F. Chandler Jr.

Department of Agronomy and Horticulture: Faculty Publications

During the past decade, the importance of plant morphology and spacing in relation to nitrogen responsiveness in terms of crop yield has been increasingly recognized, particularly in the case of the cereal grains.
It is the purpose of this paper to present examples of experimental results obtained by rice research workers which support certain significant principles. Although this treatise will be confined to the rice plant (Oryza sativa L.),as Wittwer (1968) points out, the principles elucidated are applicable to many other crops, and particularly to the small grains, such as wheat (Triticum aestivum L.), oats (Avena sativa …

Physiological Responses To Nitrogen In Plants, Yoshio Murata

Department of Agronomy and Horticulture: Faculty Publications

Recent advances in crop physiology have given us some clues for analysis of the complex relationships of environmental factors, cultural conditions and genetic factors to crop yield. However, in order to accomplish this analysis, it is quite necessary to have concrete knowledge about the causal relationships and the time sequence of the processes of yield-formation.
In grain crops, the process of yield-formation may be divided into the following three phases:
1) Formation of organs for nutrient absorption and photosynthesis,
2) Formation of flower organs and "yield-container," and
3) Production, accumulation and translocation of "yield-contents."
The effect of nitrogen, which has …

Mechanisms Of Carbon Fixation And Associated Physiological Responses, Israel Zelitch

Department of Agronomy and Horticulture: Faculty Publications

Recent work in this laboratory has been directed towards increasing net photosynthesis or decreasing the transpiration rate in higher plants by exercising biochemical control over these processes. In these experiments, the fact that both photosynthesis and transpiration involve diffusion processes that might be regulated by varying appropriate diffusive resistances has been exploited (Gaastra, 1959; Zelitch and Waggoner, 1962a). Since in most instances the pathway of diffusion of water vapor in transpiration is shorter than that of CO2 uptake in photosynthesis, and both gases must pass through the stomata, it was predicted that closing the stomata in a specific manner would …

Interrelationships Among Photosynthesis, Respiration, And Movement Of Carbon In Developing Crops, Volkmar Stoy

Department of Agronomy and Horticulture: Faculty Publications

From the preceding lectures we have learned a great deal about how external conditions may influence various internal physiological processes within plants, and it therefore appears appropriate to consider briefly how these processes influence one another and also the manner in which they relate to yield. The main processes of interest in this connection are photosynthesis, respiration, and carbon assimilate translocation; but aspects of growth, development, mineral nutrition, etc., will also be considered when relevant.

Rollins Adams Emerson (1873-1947) Horticulturist Pioneer Plant Geneticist Administrator Inspiring Student Adviser, Rosalind Morris

Department of Agronomy and Horticulture: Faculty Publications

The vigorous and highly productive life of Professor R. A. Emerson spanned 74 years and 7 months. His birth and death took place In New York State, but Nebraska nurtured his early development and schooling. He spent 15 years of his professional career at the University of Nebraska, followed by 33 years at Cornell University.

Rollins Adams Emerson, son of Charles David and Mary C. Adams Emerson (a direct descendant of Henry Adams), was born May 5, 1873 at Pillar Point, New York State on the eastern shore of Lake Ontario. In 1880 his family moved to Nebraska and settled …

The Identification Of Cis-Ii, I2-Methylene-2-Hydroxyoctadecanoic Acid From Thiobacillus Thiooxidans, H. W. Knoche, J. M. Shively

Department of Biochemistry: Faculty Publications

A polar fatty acid has been observed as a component of an

ornithine-containing lipid of Thiobacillus thiooxidans. A

comparison of thin layer chromatographic mobilities of reference

compounds to those of the natural acid and its derivatives

suggested that the acid was a 2-hydroxy fatty acid.

The presence of a cyclopropane function in the acid was

indicated by l4e-Iabeling experiments and infrared spectroscopy.

Mass spectrometry of the methyl ester and the acetylated

methyl ester of the natural acid provided a molecular

weight for the acid. Equivalent chain lengths were determined

for the natural acid, the acid obtained by oxidative

decarboxylation of …

Some Parameters Of The Second-Order Conditioning Of Fear In Rats, Alan Kamil

Papers in Behavior in Biological Sciences

The effects of CS1 duration, partial reinforcement, and trace conditioning on second-order conditioned suppression were investigated, employing 64 rats as Ss. In Experiment 1, the clearest second-order conditioning was obtained when CS1 duration was the same during both the first- and the second-order conditioning phases of the experiment. In Experiment 2, somewhat better second-order conditioning was obtained when first-order conditioning had been under conditions of partial reinforcement, delay CS-US pairing. In neither experiment were CS1 suppression and CS2 suppression during second-order testing well correlated. This aspect of the results raised the question of the influence of nonclassical conditioning factors on …

Studies On The Helminth Fauna Of Alaska, Xlvi. Davainea Lagopodis Sp. Nov. (Cestoda: Davaineidae) From Grouse (Tetraonidae), Robert L. Rausch

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Cestodes of the genus Davainea Blanchard 1891, from grouse in various Eurasian and North American regions have been identified as D. tetraoensis Fuhrmann 1919, or less frequently as D. proglottina (Davaine 1860). Those from ptarmigan (Lagopus spp.) in Alaska, resembling D. tetraoensis in some details but having only a single row of rostellar hooks and fewer testes, were earlier reported as D. proglottina by Babero (1953). The study of additional material from grouse from Alaska indicates that this cestode is specifically distinct from the two species mentioned. It is described here as new.

German abstract: Beschrieben wird eine …