Open Access. Powered by Scholars. Published by Universities.®

Life Sciences Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 14 of 14

Full-Text Articles in Life Sciences

Nutritive Evaluation Of Warm-Season Grasses In Connecticut, R.W. Taylor, D.W. Allinson Oct 1981

Nutritive Evaluation Of Warm-Season Grasses In Connecticut, R.W. Taylor, D.W. Allinson

Storrs Agricultural Experiment Station

No abstract provided.


Preliminary Nutrient Uptake Studies Of Experimental Vegetative Covers At The Maxey Flat Low-Level Nuclear Waste Disposal Site, Donna Lynn Cassity Jul 1981

Preliminary Nutrient Uptake Studies Of Experimental Vegetative Covers At The Maxey Flat Low-Level Nuclear Waste Disposal Site, Donna Lynn Cassity

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 Donna Lynn Cassity on July 27, 1981.


Succession In Wetlands: A Gleasonian Appraoch, Arnold G. Van Der Valk Jun 1981

Succession In Wetlands: A Gleasonian Appraoch, Arnold G. Van Der Valk

Botany Publication and Papers

A qualitative model of succession in freshwater wetlands is proposed, based on the life history features of the species involved. Three key life history traits can be used to characterize wetland species: life—span, propagule longevity, and propagule establishment requirements. By combining these three life history traits, 12 basic wetland life history types are recognized. For each life history type, the future state (presence only in the form of propagules in the seed bank, presence as adult plants, or complete absence) of each species type in a wetland can be predicted if environmental conditions change. Most of the information needed ...


Rare Vascular Plants Of Maine : A Critical Areas Program Report, Susan C. Gawler, L. M. Eastman Jun 1981

Rare Vascular Plants Of Maine : A Critical Areas Program Report, Susan C. Gawler, L. M. Eastman

Maine Collection

Rare Vascular Plants of Maine : A Critical Areas Program Report

Based on Rare Vascular Maine Plants (1978) with Additional Herbarium Data and Rare Plants Information by L.M. Eastman.

Introduction, Criteria, Annotated Rare Plant List, Species Accounts, Additional Herbarium Data, County & Town Index Editing by Susan C. Gawler.

Executive Department, State Planning Office, 189 State Street, Augusta, Maine, 04333 (June 1981).

Contents: Acknowledgements / List of Tables / List of Figures / Part One: Introduction / Part Two: List of the Rare Vascular Plants of Maine / Part Three: Species Accounts / Part Four: Subspecific Taxa / Appendices / Bibliography / Index by County and Town / Index to Families ...


Function Of Mentzelia Nuda (Loasaceae) Postfloral Nectaries In Seed Defense, Kathleen H. Keeler Feb 1981

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

Faculty Publications in the Biological Sciences

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.


Fall 1981, Patricia J. Vittum, Dan Paulson Jr., Bob Early, Elmer R. Fleck Jan 1981

Fall 1981, Patricia J. Vittum, Dan Paulson Jr., Bob Early, Elmer R. Fleck

Turf Bulletin

  1. Turf Clippings (page 3)
  2. Registration of Oftanol^R (Isofenphos) (4)
  3. Effect of pH Organic Matter and Solid Texture on Herbicides (6)
  4. Lawn Care: Big Potential for Fluids


Summer 1981, Ellery L. Knake, T. L. Larry, J. F. Wilkinson, R. H. Miller, Carol A. Lembi, Ted Horton, Horace Ames Jan 1981

Summer 1981, Ellery L. Knake, T. L. Larry, J. F. Wilkinson, R. H. Miller, Carol A. Lembi, Ted Horton, Horace Ames

Turf Bulletin

  1. Editorial (page 3)
  2. Results of Field Test to Study Human Exposure to 2,4,5,-T Application (4)
  3. Investigation and Treatment of Localized Dry Spots on Sand Golf Greens (6)
  4. Aquatic Weed Control- In Review (11)
  5. Golf Course Superintendent - A Perspective (14)
  6. Four Seasons Ground Maintenance (16)


Spring 1981 Conference Issue, Ruth S. Zak, Daniel Hillel, Joseph Troll Jan 1981

Spring 1981 Conference Issue, Ruth S. Zak, Daniel Hillel, Joseph Troll

Turf Bulletin

  1. Fifty Years of Turf Management Education at the University of Massachusetts (page 3)
  2. Commentary: A Case for Conditional Optimism (7)
  3. Fiftieth Annual Turf Conference and Fifth Industrial Show (10)
  4. Dollar Spot Fungicide Trials --1980 (12)
  5. Tree News (14)
  6. Insurance Requirements (16)
  7. UMass Turfgrass Research Fund (18)
  8. Exams (19)


Seed Dormancy In Pennsylvania Smartweed And Barnyardgrass , James Lowell Jordan Jan 1981

Seed Dormancy In Pennsylvania Smartweed And Barnyardgrass , James Lowell Jordan

Retrospective Theses and Dissertations

The competitive effects of maize plants on weed growth, seed production, and seed dormancy were investigated. Weed seed dormancy was studied using ultrafreezing and electron microscope techniques. The importance of weed seed dormancy in weed control was discussed;Plants of four weed species, Setaria luteschens (Weigel) Hubb., Setaria viridis (L.) Beauv., Polygonum pensylvanicum L., and Abutilon theophrasti Medic., were grown free from competition with maize. Height of Pennsylvania smartweed and velvetleaf plants increased for plants in competition with maize plants; other plant growth parameters decreased. Plant growth and seed production for green and yellow foxtail decreased for plants that were ...


Comparative Water Relations And Photosynthesis Of Mycorrhizal And Non-Mycorrhizal Bouteloua Gracilis H.B.K. Lag Ex Steud., Michael F. Allen, William K. Smith, Thomas S. Moore Jr., Martha Christensen Jan 1981

Comparative Water Relations And Photosynthesis Of Mycorrhizal And Non-Mycorrhizal Bouteloua Gracilis H.B.K. Lag Ex Steud., Michael F. Allen, William K. Smith, Thomas S. Moore Jr., Martha Christensen

Papers in Plant Pathology

The rangeland grass, Bouteloua gracilis was inoculated with its mycorrhizal symbiont, Glomus fasciculatus, to determine the influence of vesicular-arhuscular mycorrhizae on water status, stomatal behaviour and photosynthesis as well as gross plant morphology, biomass and phosphorus content. Mycorrhizal infection increased transpiration rates by over 100% with 50 to 70% lower leaf resistances to water vapour diffusion. Leaf xylem pressure was not different between mycorrhizal and non-mycorrhizal plants indicating that whole-plant resistance to water transport was reduced by more than 50%. Photosynthetic rates under saturating light conditions increased 68% with infection as a consequence of a 33% reduction in stomatal resistance ...


Effects Of Reduced Tillage And Multiple Cropping On Plant Diseases, Donald R. Sumner, Ben Doupnik Jr., M. G. Boosalis Jan 1981

Effects Of Reduced Tillage And Multiple Cropping On Plant Diseases, Donald R. Sumner, Ben Doupnik Jr., M. G. Boosalis

Papers in Plant Pathology

In the past, tillage research on plant diseases was concerned primarily with practices that buried plant residues in single-crop production systems. The burial of plant debris to destroy pathogens is an ancient agricultural prac­ tice (34). Each crop was tested as a single entity, and most crop rotations were based on one crop per year. Interest in notill and conservation tillage systems and mUltiple cropping has increased in the past two decades be­ cause of the scarcity and increased cost of fossil fuels, periodic world food shortages, and the concern over soil erosion (73,110). These concerns are of such ...


Influence Of Phosphate Source On Vesicular-Arbuscular Mycorrhizae Of Bouteloua Gracilis, Michael F. Allen, James C. Sexton, Thomas S. Moore Jr., Martha Christensen Jan 1981

Influence Of Phosphate Source On Vesicular-Arbuscular Mycorrhizae Of Bouteloua Gracilis, Michael F. Allen, James C. Sexton, Thomas S. Moore Jr., Martha Christensen

Papers in Plant Pathology

Non-mycorrhizal and vesicular-arbuscular mycorrhizal Bouteloua gracilis infected with Glomus fasciculatus were grown in defined media containing different phosphate sources and compared with respect to phosphate content and form, biomass, chlorophyll concentration, and root phosphatase activity. The phosphate sources were sodium monobasic phosphate, a mixture of sodium monobasic phosphate and calcium phytate, and calcium phytate. Inositol and inositol plus calcium were added to the sodium phosphate medium as additional treatments. Mycorrhizal infection was highest in roots of plants grown in the presence of phytate (75%). Lower root infection levels were noted in plants from the sodium phosphate (19%) and mixed phosphate ...


Cover Of Plants With Extrafloral Nectaries At Four Northern California Sites, Kathleen H. Keeler Jan 1981

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

Faculty Publications in the Biological Sciences

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.


Variation In Branch Growth Characteristics Of Pinus Contorta Infected With Arceuthobium Americanum, Lynn Anne Larsen Jan 1981

Variation In Branch Growth Characteristics Of Pinus Contorta Infected With Arceuthobium Americanum, Lynn Anne Larsen

Dissertations and Theses

Arceuthobium americanum is a flowering plant which parasitizes Pinus contorta (Lodgepole pine). This study examined branch performance of P. contorta infected to varying degrees with A. americanum.