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Physical Sciences and Mathematics Commons™
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- Compost (2)
- Vermicompost (2)
- Biocontrol (1)
- Carbon (1)
- Disease suppression (1)
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- Earthworms (1)
- Flooding (1)
- Heat transfer through soil (1)
- Iron (1)
- Manganese (1)
- Mass transfer through soil (1)
- Microaggregates (1)
- Northeastern forests (1)
- Organic (1)
- Phosphorus (1)
- Rainfall infiltration (1)
- Rhizoctonia solani (1)
- Soil Amendment (1)
- Soil structure (1)
- Sulfur (1)
- Sustainable agriculture (1)
- Thermophilic Compost (1)
- Underground power cables (1)
Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Micro-Topological Effects On Redox-Sensitive Nutrient Availability Of Manganese, Iron, Sulfur, And Phosphorus, Lindsey C. Ruhl
Micro-Topological Effects On Redox-Sensitive Nutrient Availability Of Manganese, Iron, Sulfur, And Phosphorus, Lindsey C. Ruhl
Graduate College Dissertations and Theses
The working hypothesis for this study was that small elevation differences in field depressions affect the availability of redox active nutrients because the bottom of the depression remains waterlogged and in reducing conditions longer than the edge of the depression. Mn, Fe, S and P availabilities were investigated in a field depression with a 20 meter radius and 0.5 meter depth on a flood-prone, organic vegetable farm. One depression (Depression 1) was sampled seven times during three field seasons (May 2012-June 2014). The last two dates included sampling in an additional three depressions to allow a comparison among depressions on …
Earthworm Presence In Northern Forests: Impact On Distribution Of Soil Carbon Within Aggregate Fractions, Meghan Elizabeth Knowles
Earthworm Presence In Northern Forests: Impact On Distribution Of Soil Carbon Within Aggregate Fractions, Meghan Elizabeth Knowles
Graduate College Dissertations and Theses
Growing concerns over climate change is driving research aimed at determining ways of retaining soil carbon (C) within managed northeastern forests. Earthworms are exotic to the state of Vermont and the current extent of earthworm community presence in the state's forests, as well as the long term impact these communities will have on soil C storage, is still unknown. Current research suggests that earthworms have conflicting effects on the C cycle of soils, simultaneously enhancing mineralization through soil mixing, while protecting C through the stabilization of microaggregate (mA) structures. The mA soil fraction represents a pool of physically stable structures …
Biological Indicators Of Compost-Mediated Disease Suppression Against The Soilborne Plant Pathogen Rhizoctonia Solani, Lynn Fang
Graduate College Dissertations and Theses
Compost can suppress soilborne plant pathogens that cause significant damage on globally important food crops. However, reports of plant pathogen suppression are inconsistent likely because there are no established standards for feedstock material, application rate, and maturity age upon application. Excellent results can be achieved in greenhouse trials, but field applications are much less reliable. Disease suppression occurs through the activity of biocontrol organisms (direct antagonism), and general microbial competition. Biocontrol species are hypothesized to colonize the pile during the curing phase, but single species may not be as important as microbial consortia. Substrate composition during maturation may give rise …
Effect Of Rainfall Events On The Thermal And Moisture Exposure Of Underground Electric Cables, Andrew Fuhrmann
Effect Of Rainfall Events On The Thermal And Moisture Exposure Of Underground Electric Cables, Andrew Fuhrmann
Graduate College Dissertations and Theses
Cable ampacity analysis is generally performed assuming constant worst-state environmental conditions, which often correspond to a dry soil condition or to a condition with uniform ambient soil moisture content. The characteristic time scale of thermal variation in the soil is large, on the order of several weeks, and is similar to the time scale between rainfall events in many geographic locations. Intermittent rainfall events introduce significant transient fluctuations that influence the thermal conditions and moisture content around a buried cable both by increasing thermal conductivity of the soil and by increasing the moisture exposure of the cable insulation. This paper …
An Evaluation Of Vermicompost As A Fast-Acting Nitrogen Amendment To Mitigate Nitrogen Deficiencies In Organic Vegetable Production, Peter Dalton Austin
An Evaluation Of Vermicompost As A Fast-Acting Nitrogen Amendment To Mitigate Nitrogen Deficiencies In Organic Vegetable Production, Peter Dalton Austin
Graduate College Dissertations and Theses
For sustained production, organic agriculture depends on plant needs being synchronized with the release of nutrients from organic amendments during decomposition within the soil. Because decomposition is strongly dependent on soil moisture and temperature, nutrient needs may not always be met as planned or synchronous with plant need. Unlike conventional agriculture, fast acting amendments are not readily available. Much of the evidence that vermicompost benefits crop production comes from studies on seed germination and production of starts in greenhouses. Yet, there is a dearth of information derived from field studies. Soil, soil and water nitrogen, plant development, and marketable yield …