Electronic Theses and Dissertations

Award Winner

Recipient of the 2004 Outstanding Master's Thesis Award - Second Place.

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Open Access Thesis


Thousands of hectares of warm-season grass plantings in Iowa have few to no native forbs. Diversifying these species poor plant communities with native prairie forbs could result in increased resistance to climatic extremes, increased biodiversity, reduced noxious "weedy" plant invasion, and reduced geographic isolation between existing native prairie remnants. I hypothesized that frequent mowing in the first one or two years after broadcasting forb seed into an established stand of warm-season grasses can increase forb emergence and reduce forb mortality. I further hypothesized that fall seeded forbs would establish better that those seeded in spring. To test my hypothesis, I seeded 23 forb species at a rate of 3.7 kg/ ha or 350 viable seeds/ m2. I assessed and compared forb emergence and mortality using three mowing treatments and two seeding treatments; fall seeding with frequent mowing the first growing season (mow-1), spring seeding with frequent mowing the first growing season (mow-ls) winter seeding with frequent mowing two consecutive growing seasons (mow-2), and fall seeding without mowing (no-mow). I also destructive sampled forb plants to assess growth differences between mow-1 and no-mow treatments. Over time, forb emergence was significantly (p

Year of Submission


Year of Award

2004 Award

Degree Name

Master of Science


Department of Biology

First Advisor

Laura Jackson, Co-Chair, Thesis Committee


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Date Original


Object Description

1 PDF file (ix, 180 pages)



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