Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network

Open Access. Powered by Scholars. Published by Universities.®

PDF

Iowa State University

Plant Sciences

Graduate Theses and Dissertations

Agronomy

Publication Year

Articles 1 - 4 of 4

Full-Text Articles in Entire DC Network

Investigations Into The Function Of Common Milkweed (Asclepias Syriaca) In The Agricultural Landscape, Sydney Lizotte-Hall Jan 2018

Investigations Into The Function Of Common Milkweed (Asclepias Syriaca) In The Agricultural Landscape, Sydney Lizotte-Hall

Graduate Theses and Dissertations

The monarch butterfly’s (Danaus plexippus Linnaeus) vibrant orange color with contrasting black veins and white spots make it recognizable to many. Unfortunately, the remarkable migration made by the eastern monarch population is at risk due to the recent decline in this cohort of the species. Many factors are said to have caused the decline, including overwintering habitat destruction, increased dependence on herbicide-tolerant crops, extreme climatic events, predation, loss of breeding habitat, etc.

Two studies were conducted to: 1) determine the impact of sub-lethal herbicides on growth of common milkweed and utilization by monarchs and 2) investigate simple methods for ...


Potassium And Sulfur Availability And Lime Potential Of Ash Co-Product Of Corn Cellulosic Ethanol Processing, Samuel Groenenboom Jan 2016

Potassium And Sulfur Availability And Lime Potential Of Ash Co-Product Of Corn Cellulosic Ethanol Processing, Samuel Groenenboom

Graduate Theses and Dissertations

Lignin-derived ash obtained as a co-product of corn residue used for ethanol production may have value as a soil amendment. Preliminary laboratory analyses indicated that the ash had potential lime value and higher concentrations of K and S compared with other nutrients. The value of the ash to supply K and S and to increase soil pH was evaluated at two Iowa sites compared with commonly applied sources of K (KCl) and S (gypsum) and pure CaCO3. At each site, three 2-year trials were initiated to assess the K, S, and lime values of the ash. Several rates of each ...


Agronomic, Seed Traits And Oleate Stability Of Soybean Lines Containing The High-Oleate Transgene Dp-305423-1 And The Molecular Characterization Of The Genomic Region Flanking The High-Oleate Transgene, Jordan Dustin Spear Jan 2012

Agronomic, Seed Traits And Oleate Stability Of Soybean Lines Containing The High-Oleate Transgene Dp-305423-1 And The Molecular Characterization Of The Genomic Region Flanking The High-Oleate Transgene, Jordan Dustin Spear

Graduate Theses and Dissertations

To improve the oxidative stability of soybean [Glycine max (L.) Merr.] oil, it is desirable to increase the percentage of the monounsaturated fatty ester oleate. By altering the endogenous FAD2-1gene in soybean, oleate concentrations of greater than 750 g kg-1 can be obtained. From a commercial perspective, it is important to understand the influence of this genetic alteration on agronomic and seed traits, as well as the stability of the increased oleate concentration across a range of environments.

Objective one of my research was to evaluate the influence of the DP-305423-1 high-oleate (HO) transgene on agronomic and seed ...


The Agronomic And Economic Performance Of Flax In Iowa, Stefans Robert Gailans Jan 2010

The Agronomic And Economic Performance Of Flax In Iowa, Stefans Robert Gailans

Graduate Theses and Dissertations

Demand for flax (Linum usitatissimum L.) has increased due to the discovered health benefits of adding flaxseed to human diets. A facility in northwest Iowa that processes organic flaxseed for oil provides a viable market for organic growers in the Midwest. Organic growers are particularly concerned about adequate fertility and weed management when adding flax to their crop rotations. Our objective was to evaluate flax response to N rate and source as well as to ambient weed competition when following either soybean or corn in rotation. The particular response variables investigated were seed yield, straw yield, harvest index, oil concentration ...