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Function Of Mentzelia Nuda (Loasaceae) Postfloral Nectaries In Seed Defense, Kathleen H. Keeler

School of Biological Sciences: Faculty Publications

Mentzelia nuda is a coarse, short-lived perennial of the High Plains of North America. The flowers secrete nectar which serves as an attractant for pollinating bees. Postfloral nectar secretion attracts ants whose presence significantly enhances seed set. This is the first demonstration of advantage to postflowering activity of a floral nectary.

Front Matter, Vol. 5

Great Basin Naturalist Memoirs

No abstract provided.

End Matter, Vol. 5, Index

Great Basin Naturalist Memoirs

No abstract provided.

End Matter, Vol. 5

Great Basin Naturalist Memoirs

No abstract provided.

Full Issue, Vol. 5

Great Basin Naturalist Memoirs

No abstract provided.

Investigations Of Ryegrass Toxicity., Brian A. Stynes

Experimental Summaries - Plant Research

81KA47, 81NA47, 81M047, 81KA48, 81NA45, 81M045, 81KA50, 81NA46, 81M046, To monitor the amount of toxin present in galls from the time of first head emergence until maturation of the ryegrass pastures. To relate the onset and development of toxicity to plant growth stages and climatic conditions in the different regions affected by annual ryegrass toxicity. To relate the level of toxicity to pasture density and to the number of galls present in the pasture. As part of the series of experiments done to monitor the amount of toxin present in pasture at a number of sites throughout the seasons, an …

The Bell Natural History Museum, An Aid To Teaching Botany, Harold W. Hansen

Journal of the Minnesota Academy of Science

Much of the regular academic year does not lend itself to observation of plants in their natural habitat outdoors. The museum exhibits can serve as study aids in the off season, although they should not be utilized as substitutes for field work. This study systematized some materials available for class use. Museum files, display legends, and original observations were used. From the Bell Museum of Natural History, 112 exhibits were listed and coded for location; 384 specimens, of 247 species were listed from individual displays; a massed alphabetized species index was prepared. The exhibit "Maple-Basswood Forest" was studied in detail; …

Report No 41 - A Survey Method For Identifying Roadside Flora Suitable For Conservation In Western Australia, John K. Scott

Fisheries Research Reports

A survey method for identifying flora suitable for conservation alongside roads in south-western Australia was derived from an examination of characteristics of road verges. Two roads, from Midland to Toodyay and from Armadale to Bunbury, were examined. Width of verge, weed cover, soil disturbance, vegetation structure, presence of public utilities, evidence of fire and the type of adjoining land were measured at one mile (1.6 km) intervals on both sides of the road. Also recorded were aesthetic qualities such as stands of beautiful trees and sites of special interest, e.g. the presence of rare plants.

Three variables, percentage weed cover, …

Plant Science : Agronomy, Plant Pathology, Entomology At South Dakota State University : A Centennial Report, Lyle A. Derscheid

State, University and Departmental Histories

Subject Headings:
South Dakota State University. Plant Science Department -- History South Dakota State University -- History Agricultural education -- South Dakota -- Brookings -- History Agriculture -- Research -- South Dakota -- History Agronomy -- Research -- South Dakota -- History Plant diseases -- Research -- South Dakota -- History Entomology -- Research -- South Dakota -- History Agriculturists -- South Dakota -- Biography Botanists -- South Dakota -- Biography

Report No 42 - A Guide To The Gazetted Rare Flora Of Western Australia, Barbara L. Rye, Stephen D. Hopper

Fisheries Research Reports

Descriptions and illustrations are provided for the first 100 taxa which have been gazetted as rare, likely to become extinct or in need of special protection under the Wildlife Conservation Act 1950-1979. Most of these rare taxa are restricted to the South-West Botanical Province and more than one-third occur in the Albany Wildlife District.

An outline is given of the means adopted to determine which taxa are gazetted as rare, the legal provisions for their protection and the biological data being sought for their management.

Sulphur Nutrition Of Pastures And Crops, Phosphorus And Potassium Nutrition Of High Rainfall Pastures On Deep Sands, Soil Acidity - High Rainfall Pastures, J S. Yeates, M F. Clarke

Experimental Summaries - Plant Research

A. SULPHUR - HIGH RAINFALL 1. Rates and time of application of superphosphate to pastures. 79AK2, 79AL23, 79AL25, 79AL41, 81BY1, 81KE1. 2. Sulphur soil test calibration on pastures. 79AL18, 80BY2, 80KE2. 3. Sulphur soil test calibration on pastures: Co-operative PKS soil test project on pastures on duplex soils of the east Albany area (PRD/ARO). Sulphur results. 80 AL44, 46, 47, 48, 72, 73 81AL51, 53, 55 4. Sulphur on adsorbing soils receiving no current S input. 80BY1., 80AL16. 5. Sources, rates, time of application of sulphur on pastures. 80AL1, 80AL4, 81AL3, 81AL4, 80KE1, 80MA1 B. SULPHUR - LOW RAINFALL 1. …

Phosphorus Sources Trials. Miscellaneous Trials., J. W. Bowden, R J. Lunt, M J. Baker

Experimental Summaries - Plant Research

I Sources of PhosphorusTrials - 1981 results. Pasture Trials. 76MT10 - New land pasture at Mt Barker - gravel. 77MT1 - New land pasture at Mt Barker - gravel Methods and particle size effects. 76BU1 - New land pasture at Yallingup - sand over gravel. Cropped to oats 1981. Cropping Trials. 76WH10 - Young land at Wongan Hills - ley year: W.L.S. 76WH9 - New land at Wongan Hills - W.L.S. 76N4 - New land at Newdegate - shallow gravel. 76LG6 - Young land at Newdegate - sandy gravel. 80BA6 - Young land at Badgingarra - pale, deep sand. Trials …

Bibliographie Pflanzensoziologischer Arbeiten Über Die Mongolische Volksrepublik, Werner Hilbig

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

Zusammenfassung

Die Bibliographie enthält pflanzensoziologische und vegetationsökologische Veröffentlichungen aus dem Gebiet der Mongolischen Volksrepublik (MVR) von den zwanziger Jahren bis zum Jahre 1979. Es werden 217 Arbeiten zitiert. Der Großteil dieser Publikationen stammt aus der Feder sowjetischer Geobotaniker,

A Flora Of The Higher Ranges And The Kelso Dunes Of The Eastern Mojave Desert In California, Robert P. Thorne, Barry A. Prigge, James Henrickson

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

Sperm Recovery From Oviducts Of Turkeys At Known Intervals After Insemination And Oviposition, M. R. Bakst

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

To determine whether there is a relationship between oviposition time and the release of spermatozoa from the uterovaginal junction-sperm-host glands (UVJ-SHG),oviducal segments from turkey hens were isolated and washed immediately or 8-12 and 18-22h after oviposition on Days 1, 2, 3 and 10-13 after artificial insemination. Spermatozoa were found in nearly all segments at all times examined, indicating that sperm release from the UVJ-SHG of the turkey is probably continuous or episodic and not exclusively associated with oviposition and ovulation. Alternatively, spermatozoa may be released at specific times of the daily ovulatory cycle and ascend variable distances between the UVJ …

Field Techniques Manual, Department Of Agriculture, Western Australia

All other publications

Contents : Vol. 1. Crop and pasture research--Vol. 2. Animal production--Vol. 3. Horticulture--Vol. 4. Management of natural resources.

Proceedings Of The 8th Annual Meeting, Southern Soybean Disease Workers (March 11-12, 1981, Memphis, Tennessee): Soybeans, The Crop Of The Future

Southern Soybean Disease Workers: Conference Proceedings

General Session

Presidential Address - Glen Whitney

The Influence of Plant Diseases on American Agriculture - Wiley Garrett

Integrated Pest Management: A National Prospective - B. Blair

Development in Brazil, the Future World Supplier of Food: Industry Overview - Ray Smith

Soybean Disease Loss Estimate - R. V. Sturgeon

Soybeans, Seed, Seedling, and Soil-Borne Disease, James Kantzes presiding

Standardized Seed Treatment Research Report - M. C. McDaniel

Soybean Seedling Disease Control and Plant Populations - Norman Horn

Metalaxyl: A New Seed Dressing and Soil Treatment Fungicide - H. V. Morton and D. Houseworth

Soybean Seed Treatment: U. S. Status …

Classification And Protection Status Of Remnant Natural Plant Communities In Arkansas, William F. Pell

Journal of the Arkansas Academy of Science

A classification and inventory of Arkansas's remaining tracts of relatively undisturbed vegetation was initiated in 1979. Based on extensive literature surveys and field work, the classification includes five physiognomic classes, 17 cover classes, and 46 cover types, arranged hierarchically. High quality examples of ten of the cover types have been located in designated wilderness or state natural areas, where they are protected by law, while an additional three occur in research natural areas or Forest Service special interest areas. The remaining 33 cover types have no known long-term protection. Lands having wilderness, state natural area, research natural area, or special …

Lichens Of Arkansas Ii. Additional State Records Through Computer Search, Jewel E. Moore

Journal of the Arkansas Academy of Science

No abstract provided.

Divergent Selection For In Vitro Dry Matter Digestibility In Switchgrass, K. P. Vogel, Francis A. Haskins, Herman J. Gorz

Department of Agronomy and Horticulture: Faculty Publications

The purposes of this study were to determine if phenotypic selection for in vitro dry matter digestibility (IVDMD) could be used to improve the IVDMD for switchgrass (Panicum virgatum L.) and to obtain heritability estimates of IVDMD in switchgrass. In 1973 a selection nursery of over 2,200 plants was established with transplanted seedlings of two similar Nebraska experimental strains. In 1974 about 800 plants that appeared to be agronomically superior were sampled for IVDMD. Single-plant selections for high and low IVDMD were made in each of the nursery rows. In 1976, ramets from 25 of the high-IVDMD selections and …

Insecticides And Pheromones Used In The Midwest. A Short Review, Evelyn Osbourne, Paul Schwartz

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

The Midwest produces most of the food and feed grains and oilseeds grown in the US. as well as a substantial proportion of a variety of other crops, but corn accounts for at least 75% of insecticide use in the region. The total amount of insecticides used on crops could be greatly reduced if economic losses from insects could be predicted accurately. We will examine the current status of chemical controls for insects of economic importance to this region, indicating some areas where new developments are needed or are likely to occur.

Determination Of Selenium In Biological Materials By Stable Isotope Dilution Gas Chromatography-Mass Spectrometry, Donald C. Reamer, Claude Veillon

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

Selenium can be determined quantitatively in biological samples after digestion using nitric acid, orthophosphoric acid, and hydrogen peroxide and the formation of 5-nitropiazselenol. Samples are spiked with enriched ⁸²Se and lsotoplc ratio of ⁸⁰Se to ⁸²Se is measured by combined gas chromatographymass spectrometry using dual ion monitoring. Precise determination at the parts-per-billion level is possible. The accuracy of the method Is verlfied by using standard reference materials.

Housing And Management To Reduce Climactic Impacts On Livestock, G. Leroy Hahn

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

Weather is a constraint on efficient livestock production systems. Evaluation of the degree of constraint is a difficult, but necessary task before selection of appropriate modifications in management or environments can be made. The basis for rational selection from available alternatives for the limitation of climatic stress in livestock has continued to improve, particularly with the development of rudimentary functional relationships between animal performance and weather parameters. Such relationships, when combined with probabilistic knowledge of the weather parameters, permit prediction of the reduction in animal performance under natural conditions, or of the benefits to be derived from proposed housing or …

Grass Control In Pastures., C W. Thorn

Experimental Summaries - Plant Research

Crop Yields after Pasture Manipulation in 1980. Effect of Grass Control on Pasture Production. Effect of Grass Control on Animal Production. Pasture Density Effects and Composition on Soil Nitrogen. The Effect of Kerb (R) on Rapeseed, Linseed and Barley Grass. 80M041, 80M040, 80AB2, 81A23, 81 A188, 81Ba2, 81 N3, 81 N2, 81 A11 81N21, 81Ka1, 81Ka2, 81 Na3, 81NO5, 81MO1

Cover Of Plants With Extrafloral Nectaries At Four Northern California Sites, Kathleen H. Keeler

School of Biological Sciences: Faculty Publications

Percent cover of plants with extrafloral nectaries was investigated in three California habitats with the same physiognomy as habitats previously studied in Nebraska (perennial native grassland, riparian forest, deciduous forest). In contrast to Nebraska where cover of plants with extrafloral nectaries reached 14 percent, no plants with extrafloral nectaries were found in any California transect. Chaparral was also studied; no plants with extrafloral nectaries were found.

Blood Flow To The Corpus Luteum-Bearing Ovary And Ipsilateral Uterine Horn Of Cows During The Oestrous Cycle And Early Pregnancy, S. P. Ford, J. R. Chenault

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

Total ovarian blood flow of cows (sum of flows through the ovarian artery and uterine branch of the ovarian artery), measured by electromagnetic flow probes, followed a consistent cyclic pattern, being highest from Day 10 of the oestrous cycle (oestrus = Day 0) until 4 days before the subsequent oestrus. During this period of high ovarian blood flow, blood of uterine origin flowed to the ovary through the uterine branch of the ovarian artery and was found to comprise 20-40% of the ovarian blood flow. Between Days -4 and -3, ovarian blood flow dropped (P < 0·01)from 3·2 ± 0·5 to 1·0 ± 0·4 ml/min, coincident with a reversal of flow through this anastomosis. Uterine arterial blood flow was highest (P < 0·05)from 1 day before oestrus to the day of oestrus when compared to the remaining days of the oestrous cycle. Throughout the oestrous cycle, ovarian blood flow was positively correlated with systemic concentrations of progesterone (r = 0·55, P < 0·01)and negatively correlated with systemic concentrations of oestradiol-17β (r = -0·42, P < 0·01). In contrast, uterine arterial blood flow was negatively correlated with systemic progesterone (r =-0·25, P < 0·05) and positively correlated with systemic oestradiol (r = 0·45, P < 0·05). These data provide direct evidence in the cow that a portion of the blood flowing to the ovary containing a fully functional corpus luteum is contributed by the ipsilateral uterine artery.

A Survey Of Selected Economic Plants, Virgil S. Priebe

Masters Theses

A library research project was done to gain information on the ethnic uses of plants cited in C. B. Arzeni and B. N. McKnight's "Ethnobotany", a workbook used in conjunction with Botany classes 2320 and 5452 offered at Eastern Illinois University at Charleston. The workbook represents a series of exercises on plants and their impact and importance to man. At present, there is no single book that offers explanations and comments on the diversity of plants that appear in this workbook. The purpose of this paper, therefore, is to bring together such information in one work, with the hope that …

Bulletin 3929 - Irrigation In Western Australia, K S. Cole

Bulletins - 3000 - 3999

Irrigation is essential in many parts of the world to produce essential food and profitable cash crops. Generally, those areas of land with less than 360 mm of rain spread over a distinct wet season of several months cannot grow crops for food or cash on rainfall alone. Then irrigation becomes necessary unless some peculiarity such as an oasis exists.

Ratoon Stunting Disease Of Sugarcane: Isolation Of The Causal Bacterium, Michael J. Davis, A. Graves Gillaspie, Russell W. Harris, Roger H. Lawson

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

A small coryneform bacterium was consistently isolated from sugarcane with ratoon stunting disease and shown to be the causal agent. A similar bacterium was isolated from Bermuda grass. Both strains multiplied in sugarcane and Bermuda grass, but the Bermuda grass strain did not incite the symptoms of ratoon stunting disease in sugarcane. Shoot growth in Bermuda grass was retarded by both strains.

Southeast South Dakota Experiment Farm Annual Progress Report, 1980, Agricultural Experiment Station

Agricultural Experiment Station and Research Farm Annual Reports

This twentieth annual report of the research program at the Southeast South Dakota Experiment Farm has special significance for those engaged in agriculture and the agriculturally related businesses in the nine county area of southeast South Dakota. Reports in this document include information on: temperatures and precipitation data, corn breeding and performance, soybean research and planting, crop rotation, and pest control and other topics.