Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"annual grasses"”.
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The relationship between invasive annual grasses and biological soil crust across Eastern Washington
<p>Invasive annual grasses cause ecological and economic damage across the western US and are a focal point in restoration and management plans. Managing invasion resistance of natural areas is critical to maintaining their biodiversity and function. Climate change is expected to shift species …
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Evaluation of Novel Techniques to Control Annual Grasses in Intensively Managed Turfgrass Systems
Annual grassy weeds are problematic in intensively managed turfgrass systems due to a lack of selective and affordable control options. Four projects were conducted from 2020-2023 to evaluate novel techniques for Annual bluegrass (Poa annua L.), goosegrass (Eleusine indica L. Gaertn.), and smooth …
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A Comparative Analysis of the Nutrient Composition and Digestibility of California Perennial and Annual Grasses at Four Stages of Growth
… in Angus beef cattle, of common California annual and perennial grasses: wild oats (<em>Avena barbata </em>and <em>Avena fatua</em>)<em>, </em>soft chess (<em>Bromus hordeaceous</em>)<em>,</em> filaree<em> </em>(<em>Erodium botrys</em>)<em>,</em> Italian ryegrass<em> </em>(<em>Lolium …
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The effect of resource dynamics on invasive annual and native perennial grasses in grasslands of the mid-north of South Australia / Tanja Lenz.
… on the growth and interactions between invasive annual grasses and native perennial grasses in the mid-north of South Australia. At most sites annual grass abundance was positively correlated with rainfall, soil moisture after rainfall and higher soil productivity. Perennial grass abundance was …
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Studies on Postemergence Grass Herbicides for Soybeans and Uptake, Translocation and Metabolism of Fluazifop-Butyl in Several Plants
… potential of these herbicides for controlling annual grasses in soybeans. Low rates and delayed application time to allow most grasses to germinate, resulted in nearly 100% grass control for all herbicides studied. Soil based residual grass control is possible if application is made at full …
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THE FEASIBILITY OF CHAPARRAL RESTORATION ON TYPE-CONVERTED SLOPES
… of native chaparral to non-native annual grasslands. Competition with non-native annual grasses hinders shrub establishment, presenting challenges in restoration. This study examined the feasibility of chaparral restoration in a Mediterranean-type climate, on a type-converted …
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The effects of herbivory, competition, and disturbance on island meadows
… forbs have declined relative to non-native grasses and I tested the facilitatory role of herbivory in that degradation. My investigations, novel to the field, were conducted on islands spanning the Canada-US border. Islands served as natural experimental units in a mensurative study of …
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Towards ecological restoration strategies for Peninsula Shale Renosterveld: testing the effects of disturbance-intervention treatments on seed germination on Devil's Peak, Cape Town
… century ago and is currently dominated by alien, annual grasses. Additional aspects of the study included determining the physiological status of the seed from 31 harvested species (through viability and germinability tests) towards identifying key restoration species, and, assessing intervention …
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Environmental Cues in the Seasonal Development of the Southern California Annual Grassland
<p>Annual grasslands characteristically experience a succession of seasonal phases which provide for the coexistence of various species by allowing them to make their major demands upon environmental resources at different times. Thus, an ecosystem furnishing certain resources at a limited rate is …
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Response of Pinyon-juniper woodlands to fire, chaining, and hand thinning
… = 7.43, p = 0.027] to less than 2%. Perennial grasses on the site are slightly higher in the treated area. There was a significant increase in perennial grass cover from 2013 to 2014 [F(1,10) = 14.5, p = 0.003]. The hand thinning did not have significant effects on shrubs, annual grasses, …
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The Impact of Habitat Alteration on the Population Dynamics of a Declining Woodland Bird in the Mount Lofty Ranges
… have been largely outcompeted by fast-growing annual crop grasses and herbs. This significant compositional change has altered patterns of seed production. Granivores such as the diamond firetail (Stagonopleura guttata) are likely to be affected by such alterations. This species has been …
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Relationships among spread-sticker application, blossom cap retention, berry scarring, thrips populations, and Botrytis bunch rot in 'Chardonnay' grapes, and a survey of pesticide use and pest severity in Virginia vineyards in 1990 and 1991
… opinions, black rot, Japanese beetle, and annual grasses were the most severe disease, insect, and weed problems respectively. Pesticides most commonly used were captan, glyphosate, and carbaryl.
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Evaluating the use of renewable fuel sources to heat flue-cured tobacco barns
… wood pellet burner. Full maturity harvest of annual grasses fertilized with 112 kg per ha N resulted in higher yields. However, fertilizing for maximum yield would increase the CO2 footprint for biomass fuel pellet production.
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Ecology of the stalk borer Papaipema nebris (Guenee), (Lepidoptera:noctuidae), in the southwestern Virginia no-till corn agroecosystem
… stem sections, higher numbers of larvae fed on grasses, such as orchardgrass, Dactylis glomerata L. or fescue, Festuca arundinacea Schreb., compared to numbers feeding on other plants. In no-choice laboratory and field tests, larvae tunnelled into plant stalks at the same frequency by which they …
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Targeted short-term nutrient reduction to manage Ventenata dubia an invasive winter annual grass: soil and plant responses
<p>Invasive winter annual grasses, IWAGs, have degraded extensive ecosystems around the world and continue to invade new ones yearly. IWAGs readily form large monocultures or near monocultures, thus management and restoration goals largely focus on maintaining or increasing plant diversity in …
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Effects of Cheatgrass Control on Wyoming Big Sagebrush in Southeastern Utah
… decadent stands of sagebrush with few perennial grasses and forbs. Sagebrush seedlings and perennial grasses compete for limited resources with annual grasses and forbs. To determine the affects of cheatgrass control on sagebrush growth and reproductive characteristics, imazapic (PLATEAU®, AC …
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Factors affecting the nutritional composition and digestibility of corn for silage: Cover crops and cell wall composition
… 15 different winter crop treatments: 5 winter annual grasses in monoculture or with one of two winter annual legumes (crimson clover [CC] and hairy vetch [HV]). After harvesting the winter crops, each plot was planted with either corn or forage sorghum. Crimson clover increased DM yield …
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Investigation of the relationships between biomass reduction, soil disturbance, soil nutrients and weed invasion in basalt plains native grassland remnants in Victoria, Australia
… to prevent the dominant native perennial tussock grasses from over shadowing the diversity of forbs that grow between the tussocks, but the effects of various biomass reduction methods on weediness, and the underlying causes of weediness, have not been studied in any depth. The outcomes of the …
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Forward screening for herbicide resistance in Arabidopsis thaliana and the monocot species Triticum aestivum
… Indaziflam is a potent herbicide used to control annual grasses and broadleaf weeds. To better understand the plant pathways affected by indaziflam, a forward genetic screen for indaziflam resistance was completed in A. thaliana. Approximately 750, 000 A. thaliana seeds were screened for …
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Investigations of physiological and competitive relationships of Elymus species related to establishment in the Great Basin, USA.
… North America is rapidly being invaded by exotic annual grasses that decrease cover of native perennial bunchgrasses and shrubs. Bromus tectorum (cheatgrass) is the most widespread and problematic of the annual grass invaders in the Great Basin. Restoration in the Great Basin has had limited …
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