Download or read book Interference Growth and Physiological Response of Downy Brome Bromus Tectorum and Medusahead Taeniatherum Asperum written by Abdullah Juma Al-Dakheel and published by . This book was released on 1986 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interference Growth and Physiological Respon s e of Downy Brome Bromus Tectorum and Medusahead Taeniatherum Asperum written by Abdullah Juma Al-Dakheel and published by . This book was released on 1986 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interference Growth and Physiological Respone of Downy Brome Bromus Tectorum and Medusahead Taeniatherum Asperum written by Abdullah Juma Al-Dakheel and published by . This book was released on 1986 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Growth, competitive performance, and physiological response of the introduced annuals downy brome (Bromus tectorum L. ) and medusahead (Taeniatherum asperum (Sim.) Nevski) were compared under various environmental conditions in growth chambers and greenhouses. Seeds of both species were collected near Verdi, Nevada. Effects of soil moisture on growth, resource partitioning, photosynthesis, stomatal conductance, and transpiration rates were characterized for both species. Competitive interactions between the species were assessed in replacement series experiments. Under unlimited moisture, mean dry matter production and leaf area were greater in downy brome than medusahead. Height and root/shoot ratios were higher in medusahead or similar to those of downy brome. Mean values of relative growth rate (RGR) and net assimilation rate (NAR) over the entire growing period were similar between the species. RGR was significantly higher in downy brome o f 40 d age, and higher in medusahead of 40 d age. Rate of biomass allocation to leaf area (LAR) correlated best with dry matter production in both species. LAR was higher in downy brome than medusahead on most sample dates. Moisture stress reduced height, leaf development, and consequently biomass production in both species. Downy brome maintained higher dry matter production than medusahead when moisture was limited, due to higher LAR in downy brome. Stomatal conductance and transpiration rates were higher in medusahead than downy brome throughout the growing period. Under moisture stress, both species were similar in conductance and transpiration rates. Carbon fixation response (measured by IRGA in laboratory cuvettes) to light throughout the growing period were similar for the two species, regardless of moisture conditions. Moisture stress reduced photosynthesis in each species by > 50%. Competitive performance in mixtures was related to the maximum relative growth rate (Rmax) attained during early plant development. With unlimited moisture, downy brome had higher Rmax and LAR than medusahead. These differences gave competitive superiority to downy brome in interspecific mixture. Under moisture stress, both species were similar in Rmax and in general competitive performance. Effects of three temperature regimes and two moisture levels on growth, interference, and photosynthesis response in downy brome and medusahead were investigated in growth chamber study. Plants were grown separately and in intra- and interspecific pairs. Optimum temperature for growth of both species was the moderate temperature regime (24/11 C ). At this moderate regime, medusahead yield was higher than that of downy brome. Downy brome yield was less affected by temperature extremes and was significantly higher than that of medusahead at these extremes. Moisture limitation reduced yield in both species at all temperature regimes. Variation in performance between species at each temperature regime was closely related to photosynthetic response and pattern of resource allocation. In mixtures, downy brome had higher yield than medusahead at all temperature regimes. At low temperature (16/5C), both species were competitively similar. The competitive advantage of downy brome over medusahead increased with increasing temperature and was most profound at high temperature (32/16C). In limited moisture, downy brome maintained higher yield than medusahead in pure stands and mixtures. Species competitive performance in mixture also correlated with photosynthesis and resource allocation. Effects of nitrogen and phosphorus supply on growth and interference between downy brome and medusahead were studied in sand culture using a modified replacement series experiment in the greenhouse. Three levels of nitrogen and phosphorus were applied in all possible combinations. Height, number of leaves, and biomass production were reduced in both species in response to nutrient reduction. Downy brome had higher dry matter production than medusahead at high concentrations of nitrogen or phosphorus or when both nutrient elements were present. When either nutrient was lacking, yields of both species were similar. Nitrogen deficiency was more influential on yield reduction than phosphorus in both species. In mixtures, downy brome was highly competitive at high concentrations of N and P. At lower levels of N and P, the species performed as competitive equals. Thus, early patterns of resource allocation and high growth rates in downy brome enable that species to outperform medusahead at high nutrient concentrations. Findings of these studies were discussed in relation to the distribution of the two species in the field.

Download or read book Dissertation Abstracts International written by and published by . This book was released on 1986 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book American Doctoral Dissertations written by and published by . This book was released on 1985 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Budgeting and Financial Management for Nonprofit Organizations written by Lynne A. Weikart and published by Waveland Press. This book was released on 2021-08-30 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: A nonprofit’s mission cannot be achieved unless there are resources available to fund it—without a sound financial strategy, a nonprofit cannot thrive. By creating stable financial foundations for their nonprofits, managers take advantage of the nonprofit sector’s size and scope, realize all of the sources and distribution of revenues, and effectively develop fiscal risk assessment methods and apply strategies to mitigate risk. Nonprofit managers must comprehend and efficiently use the financial tools available to them to develop financial policies that will help them to succeed in many types of economies. The Second Edition presents financial concepts in a straightforward format grounded in real examples that are readily accessible to students from any background. The authors provide the groundwork for solid accounting principles and ethical guidelines, define and set standards for internal controls and audits, and explain the ingredients used to measure program performance. Today’s nonprofits must also be aware of the growing scope of the fourth sector of social enterprise, which can inspire nonprofits to be flexible, creative, and innovative in achieving their missions.

Download or read book SID Sheep Production Handbook written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nutrient Requirements of Goats written by and published by National Academies Press. This book was released on 1981 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Each of these popular handbooks contains comprehensive information on the nutritional needs of domestic animals and includes extensive tabular data. All are paperback and 8 1/2 x 11. Some books come with diskettes or Cds that allow users to predict nutrient requirements of specific animals under various conditions and at various life stages.

Download or read book EPA SAB written by and published by . This book was released on 1974 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pesticides in Soil and Water written by W. D. Guenzi and published by . This book was released on 1974 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pesticide-clay-water interactions; Pesticide organic matter interactions; Movement of pesticides in soil; Movement of pesticides in surface water; Volatilization of pesticides; nonbiological degradation of pesticides; Degradation of pesticides by soil microorganisms; Persistence of pesticides in soil; Effects of soil on the biological activity of pesticides; Plant uptake of insecticides, fungicides, and fumigants from soils; Effects of pesticides on microorganisms in soil and water; Effects of pesticides on nontarget invertebrates in freshwater and soil; Prevention and detoxification of pesticide residues in soil; Removal of organic pesticides from water to improve quality; Extraction and analytical techniques for pesticides in soil, sediment, and water.

Download or read book Forestland Grazing written by Nathan A. Byrd and published by . This book was released on 1980 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Timber Trends in the United States written by and published by . This book was released on 1965 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Pesticide Review written by United States. Agricultural Stabilization and Conservation Service and published by . This book was released on 1967 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book World War I written by Ian Westwell and published by . This book was released on 2012 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Timber Resources for America s Future written by United States. Forest Service and published by . This book was released on 1958 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Guide to Plant Poisoning of Animals in North America written by Anthony Knight and published by Teton NewMedia. This book was released on 2001-10-15 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: A definitive guide to the clinical assessment, management and prevention of plant poisoning in domestic animals. Accurate Identification of plant materials through the use of 253 high quality color illustrations placed as needed throughout the text. Organized into sections according to the animal symptoms with specific descriptions of the toxins involved and their modes of action. Geographic location maps are provided which highlight the distribution of specific plant material within North America. The title is extensively referenced and includes a functional glossary of botanical terms for the convenience of the user. This durable physical presentation makes it an optimal field reference guide. Published by Teton New Media in the USA and distributed by Manson Publishing outside of North America.