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 14 of 14 for “"long-term experiment"”.
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The Investigation of the Soil Seedbank in a Long-term Mowing and Fertilization Experiment
… have affected the seedbank community in a long-term experimental study of a coastal plain wetland. After 20 years of mowing, unmowed plots are dominated by trees with a limited understory, while the mowed plots are dominated by herbaceous perennial species. Long-term fertilization and …
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Long term effects of wet site timber harvesting and site preparation on soil properties and loblolly pine (Pinus taeda L.) productivity in the lower Atlantic Coastal Plain
Short term studies have suggested that ground based timber harvesting on wet sites can alter soil properties and inhibit early survival and growth of seedlings. Persistence of such negative effects may translate to losses in forest productivity over a rotation. During the fall and winter of 1989, …
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Tropical bracken, a powerful invader of pastures in South Ecuador: Species composition, ecology, control measures, and pasture restoration
… by repeated burning of the areas. In the long run, the grass was outcompeted by the fern possibly due to weakening of its vitality by burning and grazing, and the areas have been abandoned. The density of bracken fronds in a settled bracken area of our research site remained constant over …
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Salt stress responses in pear and quince: physiological and molecular aspects
… responses in pear and quince. Two different experiments have been performed: a “short-term” trial in a growth chamber and a “long-term” experiment in the open field. In the short-term experiment, three different genotypes usually adopted as pear rootstocks (MC, BA29 and Farold®40) and the …
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Studies of tumor promoters and drug-metabolic enzymes in hamster buccal pouch mucosa
… hamster buccal pouch mucosa (HBPM) model. Two experiments were designed to investigate the effects of two new mouse skin tumor promoters, okadaic acid (OA) and methyl methanesulfonate (MMS), on HBPM. Short term effects of OA were studied. A single application of10 1.1.g of OA in 0.1 ml of …
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Virus-host interactions in the cassava brown streak disease pathosystem
… of host-tolerance on virus was investigated in a long-term experiment where three cassava varieties Albert, Kiroba and Kaleso (field-resistant to CBSD) were graft-inoculated with UCBSV and CBSV. The three cassava varieties showed differences in virus movement, symptom development, severity and …
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Variation in the physiological processes of eastern white pine (Pinus strobus L.) differing in sensitivity to ozone, sulfur dioxide, and nitrogen dioxide
… pollutant sensitivity classes (i.e. sensitive, intermediate, and tolerant) were exposed to ozone, sulfur dioxide, and nitrogen dioxide singly, and in. combinations at various concentrations. Visible symptom expression, needle length, and needle dry weight of current year needles were determined …
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Long-Term Effects of Rice Rotation, Tillage, and Fertility on Near-Surface Soil Carbon and Nitrogen Cycling
… region of eastern Arkansas, to evaluate the long-term effects of rice-based crop rotations [with corn (Zea mays L.), soybean (Glycine max L.), and winter wheat (Triticum aestivum L.)], tillage [conventional-tillage and no-tillage (NT)], soil fertility (optimal and sub-optimal), and soil depth …
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Mineral element profiles of animal wastes and edible tissues from cattle fed animal wastes
Experiments were conducted to determine mineral element levels in feedstuffs, animal wastes and tissues from cattle fed broiler litter or cattle waste. Heifers fed 30% broiler litter ensiled with corn forage performed as well as heifers fed corn silage and soybean meal but performance tended to be …
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Soil health assessment of the Sanborn Field long-term experimental study
… soil health characteristics of the Sanborn Field long-term experimental study in Columbia, Missouri, United States. Soil samples were collected on each of four dates over two years (8 th May 2014, 4th September 2014, 1st April 2016, and 18th August 2016) from selected plots to address each …
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Geological applications of synthetic fluid inclusions
… in the system NaCl-KCl-H₂0 have been determined by experimentally synthesizing fluid inclusions in quartz in the presence of known brine compositions and then measuring the dissolution temperatures of halite and/or sylvite daughter crystals within the inclusions using a microscope …
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Assessing the impact of cover crops on soil health in a long-term no-till rotation: a case study from Northeast Kansas
… practices like conventional tillage and prolonged fallow periods. Despite its recognized benefits, there are concerns regarding potential drawbacks, such as nutrient stratification and soil acidification over time. Cover crops have emerged as a promising tool for enhancing soil health, …
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Oil Palm’s Sustainable Future: The influence of within-plantation management practices on yield and pollinator diversity in oil palm
… data chapter, I used data from a large-scale, long-term experiment that manipulated understory vegetation complexity in industrial oil palm plantations in Riau, Indonesia, to analyze whether enhancing understory complexity in mature oil palm plantations can influence yield in varying rainfall …
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Decoupling aggression and risk-taking: patterns of variation in two species of freshwater fish
… biology and aquaculture. Chapter 2 describes a long-term experiment on boldness, aggression and the relationship between them in sticklebacks that grew at different rates under two different competitive regimes. In one treatment (the low interaction condition) food was dispersed, while in the …