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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 73 for “"Plant populations"”.
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Quantifying and Simulating Fine-Scale Spatial Patterns in Plant Populations
<p>Plant ecology as a discipline has increasingly acknowledged the importance of fine-scale spatial patterns in developing our understanding of community/population dynamics. These spatial patterns are largely determined by direct and indirect interactions between plants and their immediate …
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Estimates of Genetic Parameters From a Liguleless Corn Synthetic Grown at Two Plant Populations
Made available in DSpace on 2014-12-14T14:37:20Z (GMT). No. of bitstreams: 1 7714932.pdf: 2220099 bytes, checksum: 65999241659c2f8cb6a80c2735f3d02b (MD5) Previous issue date: 1977
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Yield and water use efficiency of different plant populations of dryland corn and sorghum
… The objective was to determine the effect of plant population on yield, water use, and water use efficiency, of one cultivar of corn (<i>Zea mays</i> L.) and two cultivars of sorghum (<i>Sorghum bicolor </i>(L.) Moench). Plant population treatments for corn were 37, 49, and 62 thousand plants …
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The effect of maleic hydrazide in controlling plant populations in the strawberry in southwest Virginia
… Maleic Hydrazide (MH) in controlling strawberry plant populations were studied. Foliar applications of MH at 1000 ppm resulted in reduced runner length. The effect of MH sprays appeared to be directly related to the stage of rooting at the time of spray applications. Rooted plants were affected …
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Use of herbicides, tillage, and grazing cattle for establishment of corn in rotation with alfalfa and rye
… (Medicago sativa) survival, corn (Zea mays) plant populations and corn growth in an alfalfa-corn rotation. Alfalfa was overseeded with rye (Secale cereale) in autumn prior to planting corn in spring of each year. Treatments were 1) non-grazed control with standard chemical treatments for …
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Agronomic management to improve corn productivity under high-yielding environments
… corn grower makes today are: 1) which hybrid to plant, 2) what population to plant, and 3) what nitrogen (N) program to use. Hybrid selection is a critical management decision made by farmers because for any given year the spread in grain yield among current commercial hybrids that year can be …
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Distribution of Invasive Plant Species on Debris Cones at Mount Rainier National Park
<p>Invasive plant populations within Mount Rainier National Park are a biological and ecological threat to the unique mountain landscape. A better understanding of their distribution and transport within the landscape is needed to improve invasive species monitoring for National Park Service …
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Contribution of crop morphological characteristics and density of selected crops to weed species composition and suppression
… of the different crop species and different crop populations (p < 0.001). Weed dry matter (DM) was lowest in turnip (0.58 g/m²) and highest in dwarf French bean (123.50 g/m²) at final harvest. By final harvest crop density had a marked effect on weed DM production. There was decreased weed DM at …
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Empirical investigation of de novo mutations conferring herbicide resistance
… select for adaptive alleles that allow weed populations to survive. These resistance alleles may be available immediately from the standing genetic variation within the population, as well as, may immigrate via pollen or seeds from other populations. Moreover, because all natural populations …
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Intercropping Studies With Soybean (Glycine Max (L.); Merr.) and Maize (Zea Mays L.) or Ryegrass (Lolium Perenne L.)
… was two rows of soybean per row of maize. Maize plant populations were 30,000 plants/ha and soybean populations were 250,000 plants/ha.
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Loblolly Pine Genetics Structure Its Mycorrhizal Community
<p>Plant populations are constantly exposed to a multitude of biotic and abiotic environmental selection pressures. The ability of a population to persist in or adapt to its environment is heavily influenced by the genetic underpinnings of the traits involved. Thus, in order to understand patterns …
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Transient dynamics in plant population models
… explores the role of transient dynamics in plant populations based on long-term demographic data. Based on a survey of modeling results for plant populations in the literature, I found that theoretical indices of transient behavior greatly overemphasized the role of transient responses for …
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Transient dynamics in plant population models
… explores the role of transient dynamics in plant populations based on long-term demographic data. Based on a survey of modeling results for plant populations in the literature, I found that theoretical indices of transient behavior greatly overemphasized the role of transient responses for …
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The Detection of Morphological Variation across Time in Two Roan Mountain Endemics: <em>Geum radiatum</em> and <em>Houstonia montana</em>.
… variation between geographically distant populations has long been recognized. The primary objective of this study was to test whether nonrandom shifts in morphology have occurred across a 150-year time span in two rare, endangered plant species <em>Geum radiatum</em> and <em>Houstonia …
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Agronomic management and biostimulants to increase corn and soybean productivity
… the yield increases are nitrogen (N) fertility, plant population, foliar protection, hybrid/variety, and additional nutrient fertility. Recently another management factor, biostimulants, is being evaluated as an option to further increase grain yield. Biostimulant products vary in their function, …
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Structure of relict arctic plant communities along the north shore of Lake Superior
… of Lake Superior is home to disjunct arctic plant populations which are relicts from the Wisconsinan glaciation and survive in a cold lake-supported microclimate. Although these species are threatened by climate change, there have been few studies about their structure and diversity and …
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Application of Machine Learning and Hyperspectral Imaging in Plant Phenomics Research
… cover, and pod location in edamame for many plant populations in short time using less labor and resources. Using genome-wide association study, we identified several genetic markers that were associated with those traits. These markers can be used in marker-assisted selection to develop the …
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Evaluation of Weed Management and the Agronomic Utility of Cotton Grown on a 15-Inch Row Configuration and the Biology and Ecology of Doveweed
For more than a century, farmers planted cotton in rows spaced 91-cm or more apart. Row spacing was dictated primarily by equipment for cultivation, which was initially draft animals and later, tractors. Harvesting equipment also was designed to accommodate these wide row spacings. Recent advances …
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Consequences of plant population size for pollinator visitation and plant reproductive success
… have a prominent role in determining the size of plant populations, and can affect plant-pollinator interactions. It is hypothesized that in small plant populations the ability to set seeds can be reduced due to limited pollination services, since individuals in small populations can receive less …
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Prescribed Fire Effects on Woodland Structure, Light Levels and Understory Plant Communities in Missouri Oak-Hickory Woodlands
… measure of the light available to understory plant populations because canopy closure measured with a concave spherical densiometer is often used as a surrogate for light measures. There was a significant linear relationship between canopy closure and transmittance of photosynthetically active …
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