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Full-Text Articles in Life Sciences
Volunteer Glyphosate-Resistant Corn And Soybean Competition And Control, Jill Alms
Volunteer Glyphosate-Resistant Corn And Soybean Competition And Control, Jill Alms
Electronic Theses and Dissertations
The continuous use of glyphosate-resistant crops has resulted in volunteer crops with the same herbicide resistance as the cash crop and an increasing weed problem. Volunteer corn reduces soybean yields however; little research has examined corn yield loss due to volunteer corn or volunteer soybean competition. These studies investigated yield loss and control of volunteer soybean in corn, and volunteer corn in soybean and corn. Using several densities of competitive plants, the yield loss was fit to a hyperbolic equation that indicated incremental yield loss (I value) to be 29.9 for volunteer corn in soybeans, 5.6 for volunteer corn in …
Spatial Variability Of Saline And Sodic Soils In The Black Glaciated Region Of The Northern Great Plains, Usa, Rachel K. Owen
Spatial Variability Of Saline And Sodic Soils In The Black Glaciated Region Of The Northern Great Plains, Usa, Rachel K. Owen
Electronic Theses and Dissertations
Recent (1990-2014) increases in salt affected soils in the Northern Great Plains states of South Dakota (SD) and North Dakota (ND), MLRA 55B and 55C, have prompted more intensive research on groundwater derived saline and sodic soil characteristics in semi-humid and humid climates. Past research has focused on salinity and sodicity in irrigated agricultural systems in semi-arid and arid climates. Due to the disconnect between prior research and current problems in this region, it is necessary to assess widely used laboratory methods, and determine if short cuts can be used for rapid evaluation. The objectives of this research were: 1) …
Drought Resistance And Resilience Of Non-Native Vs. Native Grasses In The Northern Tallgrass Prairie, Wyatt Kirwan
Drought Resistance And Resilience Of Non-Native Vs. Native Grasses In The Northern Tallgrass Prairie, Wyatt Kirwan
Electronic Theses and Dissertations
Drought can have major impacts on rangeland productivity and remains highly unpredictable. Like many other rangelands in the US, the Tallgrass Prairie of eastern South Dakota contains native prairie where the plant composition includes mostly native species as well as pasture that has been converted to or invaded by cool-season introduced species. So how are these two plant communities impacted by drought? The specific objective of this study was to compare drought resistance and drought resilience of native prairie to introduced cool-season pasture (Smooth brome - Bromus inermis and Kentucky bluegrass - Poa pratensis). Our Hypothesis was that native prairie …
Classifying And Mapping Native Grasslands Of South Dakota's Northern Prairie Coteau And Characterizing Habitat For Dakota Skipper Conservation, Diane M. Narem
Classifying And Mapping Native Grasslands Of South Dakota's Northern Prairie Coteau And Characterizing Habitat For Dakota Skipper Conservation, Diane M. Narem
Electronic Theses and Dissertations
Native tallgrass prairie is becoming increasingly rare due to conversion and degradation, putting pressure on endemic prairie species such as the federally threatened Dakota skipper butterfly (Hesperia dacotae). To develop a conservation plan for the butterfly in South Dakota, accurate vegetation classification, mapping, and characterization are critical. The objectives of this study were to 1) rank prairie condition, 2) classify and map upland prairie, 3) characterize and compare vegetation at Dakota skipper inhabited and formerly inhabited sites, and 4) identify potential Dakota skipper habitat within a 225 mi2 (58,275 hectares) study area of the SD Prairie Coteau. Condition metrics were …