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An agroecological approach to incorp...

The University of Wisconsin - Madison.

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An agroecological approach to incorporating native warm-season grasses into Wisconsin farms.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	An agroecological approach to incorporating native warm-season grasses into Wisconsin farms./
作者:	Woodis, Julie Elizabeth.
面頁冊數:	151 p.
附註:	Adviser: Randall D. Jackson.
Contained By:	Dissertation Abstracts International69-05B.
標題:	Agriculture, Agronomy. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3314292
ISBN:	9780549629818

An agroecological approach to incorporating native warm-season grasses into Wisconsin farms.
Woodis, Julie Elizabeth.

An agroecological approach to incorporating native warm-season grasses into Wisconsin farms. - 151 p.

Adviser: Randall D. Jackson.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2008.

Managed grazing for livestock production is a growing enterprise in the temperate USA. Most grass-based farmers sow non-native species and manage for low-diversity plant assemblages. However, higher plant functional group diversity in pastures has potential benefits. We employed an agroecological research framework by formulating specific social, ecological, and agronomic research objectives related to the incorporation of native warm-season grasses into Wisconsin farms. First, we constructed a written questionnaire assessing Wisconsin farmer attitudes towards and perceptions of native grasses. Thirty-five percent of farmers indicated that they are interested in native grasses for pasture use, but a large majority of respondents reported that they are unfamiliar with the identification and establishment of native grasses. The most important predictor of farmer interest in native grasses was their perception of how native grasses affect the environment. Second, in a field experiment, three native warm-season grasses were drill-seeded into an existing cool-season pasture at two times (spring and fall), and combinations of disturbance (grazing and burning) and soil amendments (nitrogen, carbon, and ambient) were applied to promote their establishment. Native grasses did not establish where nitrogen was applied, and the carbon amendment limited the rate of recruitment compared to the ambient treatment. For non-nitrogen plots, establishment was greater under burning vs. grazing but did not differ between seeding times. An ordination analysis showed that shifts in the plant community were driven more by treatments than by environmental factors. Treatments also affected pasture production, but the nature of the effect varied by year. Over 50% of the variability within forage quality parameters was attributed to non-management variables. Third, a greenhouse experiment that tested how defoliation timing and intensity affected production of smooth brome (cool-season) and big bluestem (warm-season) grasses showed different treatment effects on similar metrics: total available forage and aboveground production. Smooth brome produced more total biomass, although during late-summer months big bluestem yielded more available forage. There were challenges to this interdisciplinary approach, but in addition to generating information that informs plant ecology theory and farm management, it allowed us to target gaps in current research and better understand agroecosystems as a whole.

ISBN: 9780549629818Subjects--Topical Terms:

1018679
Agriculture, Agronomy.

An agroecological approach to incorporating native warm-season grasses into Wisconsin farms.
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