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Evaluating Cool-Season Turfgrasses as Potential Perennial Groundcover for Maize Production Systems.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Evaluating Cool-Season Turfgrasses as Potential Perennial Groundcover for Maize Production Systems./
Author:	Chen, Allen A.
Description:	1 online resource (117 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 83-12, Section: B.
Contained By:	Dissertations Abstracts International83-12B.
Subject:	Agronomy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28967601click for full text (PQDT)
ISBN:	9798819395950

Evaluating Cool-Season Turfgrasses as Potential Perennial Groundcover for Maize Production Systems.
Chen, Allen A.

Evaluating Cool-Season Turfgrasses as Potential Perennial Groundcover for Maize Production Systems. - 1 online resource (117 pages)

Source: Dissertations Abstracts International, Volume: 83-12, Section: B.

Thesis (Ph.D.)--Iowa State University, 2022.

Includes bibliographical references

Agriculture in the American Midwest is characterized by high intensity maize (Zea mays L.) and soybean (Glycine max (L.) Merr.) production. Many conventional practices have led to degradation of the environment and represent a considerable loss of valuable ecosystem services. Perennial groundcovers (PGC) are a unique approach to addressing the many issues associated with maize production, while providing an alternative to other conservation practices, such as the use of annual cover crops, which can complicate management and affect economic returns. We conducted three studies to develop perennial groundcover systems based on cool-season turfgrasses. Two studies were field experiments that investigated the compatibility of cool-season PGCs when grown with maize, one that explored unimproved and wild turfgrass germplasm obtained from the USDA-GRIN, while the other evaluated commercially available cultivars of cool-season turfgrasses. The third study investigated the photothermal controls behind the summer dormancy mechanism in Sandberg bluegrass (Poa secunda J. Presl) under controlled environment conditions. The first field experiment used 20 accessions of Kentucky bluegrass (Poa pratensis L.), Sandberg bluegrass, and red fescue (Festuca rubra L.) interplanted within conventional maize for two years. No differences in maize grain yield were detected between species treatments during the establishment year in 2017. In 2018, only red fescue was different from all other treatments. Maize grain yield under the no-grass control was 10.0 Mg ha-1, 9.7 Mg ha-1 with Sandberg bluegrass, 8.9 Mg ha-1 with Kentucky bluegrass, and 7.9 Mg ha-1 with red fescue. Additionally, maize grown with red fescue produced 2.3 g kg-1, 4.8 g kg-1, and 3.9 g kg-1 more protein than Kentucky bluegrass, Sandberg bluegrass, and control, respectively, but produced 878 L ha-1 and 758 L ha-1 less estimated ethanol than the control and maize grown with Sandberg bluegrass, respectively. The second field experiment evaluated commercially available cultivars of cool-season grass as PGC across seven species: Kentucky bluegrass (Poa pratensis L.), red fescue (Festuca rubra L.), sheep fescue (Festuca ovina L.), tall fescue [Lolium arundinaceum (Schreb.) Darbysh.], Sandberg bluegrass (Poa secunda J. Presl), western wheatgrass (Pascopyrum smithii P.A. Love), and intermediate wheatgrass [Thinopyrum intermedium (Host) Barkworth & D.R. Dewey] over three years. In 2018, maize grown with 'Shannon' Kentucky bluegrass was not different from the no-grass control, yielding only 1.3 Mg ha-1 less. All other grass treatments yielded less grain than the control. In 2019, maize grown with 'Summer' and 'JT-783' tall fescue were not different from the control, though with considerable grain yield decreases of 2.3 Mg ha-1 and 2.6 Mg ha-1, respectively. In 2020, yield comparisons were inconclusive due to severe damage from a storm, but all species treatments yielded similarly to the no-grass control. These results, which were obtained without any growth suppression of the PGC in the spring, indicate that with careful selection, Kentucky bluegrass and Sandberg bluegrass have the potential to be used as PGC without adversely affecting maize grain yields. Future goals in developing PGCs for maize production should focus on introducing more compatible turfgrasses, either through breeding or selection of desirable traits. Additional research is needed to investigate the nutrient dynamics and interactions of a PGC system with the main crop, as well as implementation of cool-season PGCs in other cropping systems and maize hybrids.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798819395950Subjects--Topical Terms:

2122783
Agronomy.
Subjects--Index Terms:

Cover cropsIndex Terms--Genre/Form:

542853
Electronic books.

Evaluating Cool-Season Turfgrasses as Potential Perennial Groundcover for Maize Production Systems.
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