Theses and Dissertations at Montana State University (MSU)
Permanent URI for this collectionhttps://scholarworks.montana.edu/handle/1/733
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Item Extending cool season production of vegetables in the high tunnel: balancing heat and light(Montana State University - Bozeman, College of Agriculture, 2019) Baumbauer, David Alan; Chairperson, Graduate Committee: Mac Burgess; Macdonald H. Burgess was a co-author of the article, 'The Montana high tunnel growers survey - identifying grower practices and concerns' submitted to the journal 'HortTechnology' which is contained within this thesis.; Macdonald H. Burgess was a co-author of the article, 'Row cover influences light transmisson, air and soil temperatures in the high tunnel during Spring and Fall' submitted to the journal 'Journal of agricultural and forest meteorology' which is contained within this thesis.; Macdonald H. Burgess was a co-author of the article, 'Season, sowing date, and row cover influence the production of cool season vegetables in the moveable high tunnel' submitted to the journal 'Canadian journal of plant science' which is contained within this thesis.; Colleen B. Schmidt and Macdonald H. Burgess were co-authors of the article, 'The influence of low daily light integral on the growth of baby kale, lettuce and spinach' submitted to the journal 'HortScience' which is contained within this thesis.Montana high tunnel growers face challenges associated with being at a northern latitude and high elevation. The wide seasonal fluctuation in photosynthetically active radiation coupled with wide diurnal temperature swings produces a dynamic growing environment within the high tunnel. This dissertation is comprised of four studies investigating the management of light and temperature and their influences on high tunnel grown crops. Chapter one is an introduction to high tunnels and production strategies. Chapter two discusses the results of the Montana High Tunnel Growers Survey, in which respondents reported that managing the high tunnel environment was their number one challenge. Two thirds of respondents produced crops during the shoulder seasons of spring and fall, a period of time when the climatic conditions are especially dynamic. Chapter three presents the findings on the influences various types of season extension have on light and temperature levels and the impacts they have on the accumulation of growing degree hours, soil degree hours, and daily light integral. While each layer retains heat, moderating the effect of low night air temperatures, it comes at the cost of lower light energy at the crop level. Heat retention performance of high tunnel plus row cover improves as outside air temperature decreases, maintaining crop level air temperature at -3°C despite an outside air temperature of -22°C. Chapter four presents the results of seeding date and row cover effects on the yield and days to harvest of six cool season crops. Row cover within the high tunnel only improved crop yields when outside air temperatures were well below the historical average. The early seeding date in the fall resulted in higher yields and fewer days to harvest, indicating that the two weeks difference between August 15th and August 30th has a large impact on production. Chapter five reports on the influence of low daily light integral has on the production of kale, lettuce, and spinach. While all three responded to increasing light, lettuce had the largest response with a 200% increase in dry weight when the daily light integral increased from 8 to 14 mol m -2 d -1.Item A yield and day length requirement evaluation of single- and multi-cut sainfoin (Onobrychis viciaefolia Scop.)(Montana State University - Bozeman, College of Agriculture, 1969) Delaney, Ronald HowardItem Visualization of light inside leaves of Saxifraga rhomboidea(Montana State University - Bozeman, College of Engineering, 2002) Brown, Lisa AnnItem The Corn Palace is blue, or, Interiors I know(Montana State University - Bozeman, College of Arts & Architecture, 1992) Jacobson, David PaulThe primary abstract component in my paintings and pastels is the intensity of color that is provided by my responses to light. The hues and geometric shapes of light and architecture subdue the illusion of three dimensional space: distant light - walls and ceilings - advance, while foreground - floors and furniture - recede. I design these architectural elements and paint them in colors that will facilitate a coexistent duality of flatness and perspective depth. To achieve harmony in this contrast of illusion, I use both simple and complex processes. By sketching, drafting, and xeroxing, I investigate light and value, composition and color. The results of these explorations are skeletons for my paintings and pastels. I then translate these preliminary ideas into more complete pieces by using first opaque and then transparent layers of paint or pastel to achieve intense, but balanced color effects. The spaces I portray are de-humanized even in my initial sketchings. Occupants in these public spaces have no importance to me. In this respect, I am a minimalist. My work manifests a personal and abstract narrative which consists of color, shape, geometry and design. The human element is, and is provided by, the viewer.Item Temperature, light, and soil effects on the establishment of Bebb's willow (Salix bebbiana)(Montana State University - Bozeman, College of Agriculture, 1989) Atchley, Jennifer LauraItem The effect of pre-adult and adult light on reproductive performance of white leghorn pullets(Montana State University - Bozeman, College of Agriculture, 1961) Wilcox, Thomas W.Item Moments(Montana State University - Bozeman, College of Arts & Architecture, 1990) Honeyman, Elizabeth FryeSpace, color, light, rhythm, and movement are among the formal qualities I use to express my moment of creation. The two sets of paintings (the black and white paintings and the fluorescent paintings) reflect the time and place in which they were painted. Most of the fluorescents were painted during the bright summer and in a large well-lighted studio. The black and white paintings are products of the dark cramped studio in which they were painted. These were done during the fall and early winter. These works are created in a direct and immediate relationship with the canvas and are a reflection of the process of life. The process of painting coequals the fluidity and awareness of the moment and its expansion into life.Item Evaluation of intercropped sugar beets Beta vulgaris L. with emphasis on competition for light(Montana State University - Bozeman, College of Agriculture, 1971) Ozkan, MuammerItem On the geometry and topology of the angular momentum of light(Montana State University - Bozeman, College of Letters & Science, 2010) Gelbord, Todd Richard; Chairperson, Graduate Committee: Sachiko TsurutaThe classical field theory approach to the angular momentum of light, specifically how it represents the spin angular momentum of light, has been a matter of controversy for some time. This thesis analyses the aforementioned approach from the point of view of the Exterior Calculus and de Rham Cohomology. It is found purely mathematically that the spin angular momentum of a circularly polarized plane wave of light must be identically zero. It is concluded that the classical formulation of the angular momentum of a plane wave of light is, on some level, incomplete.