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Eva Fang Thesis.pdf (8 MB)

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The Effects of Methiozolin Rates and Nitrogen Fertility Strategies for Annual Bluegrass Control and Creeping Bentgrass Safety on Golf Greens

Fang, Chen
http://rave.ohiolink.edu/etdc/view?acc_num=osu1448982403

Abstract Details

2015, Master of Science, Ohio State University, Horticulture and Crop Science.
Annual bluegrass (Poa annua L.) is considered the most problematic weed on golf greens because of its fecund characteristic, low heat and disease tolerance in the summer, massive seed head reproduction, and bright green color. Methiozolin was initially an herbicide for weed control in crop fields and now is being developed for annual bluegrass control on golf greens. It has shown effectiveness and safety on multiple grass species, including creeping bentgrass (Agrostis stolonifera), kentucky bluegrass (Poa pratensis), and bermudagrass (Cynodon dactylon). As a systemic herbicide, methiozolin is mainly taken up by root absorption and shows limited acropetal movement in the plant. It is recommended that methiozolin be watered in immediately after application. Nitrogen, as one of the essential elements of plants, plays an important role in the lateral growth and chlorophyll formation of creeping bentgrass, which can greatly influence the recovery rate, color, and other quality characteristics of the turfgrass surface. Digital Image Analysis (DIA) is a new method for turfgrass surface quality evaluation. DIA has shown efficiency in data analysis with an equal accuracy as the normalized difference vegetation index (NDVI) and better consistency than visual evaluation method (NTEP). Two experiments were conducted on the Ohio State University Golf Club practice green and one on a USGA green at the Ohio Turfgrass Foundation Research and Education Facility. The first project on the OSU Golf Club putting green was designed to study the interaction of methiozolin, nitrogen rate and fertilizing frequency on creeping bentgrass recovery and annual bluegrass suppression/control in the spring with fall only methiozolin treatments and fall/spring methiozolin treatments. The second project consisted of three methiozolin rates and four rates to determine the best combination of spring methiozolin rate and spring nitrogen application strategies that shows best control over annual bluegrass while benefiting creeping bentgrass recovery and safety. The third project at the OSU Research and Education Facility was to study the effects of five nitrogen rates on the lateral growth/recovery and quality of creeping bentgrass with/without methiozolin treatments. The first project found that there was no significant interaction between methiozolin, nitrogen rates and fertilizing frequency in the spring. Spring methiozolin applications had a negative effect on creeping bentgrass color and recovering rate, but also a subsequent control on annual bluegrass after methiozolin fall treatments. Among all nitrogen strategies, the 24.4 kg N ha-1 every two weeks and the 12.2 kg N ha-1 every week were the best for creeping bentgrass green-up and recovery in the spring of 2014. The second experiment project found that methiozolin rates higher than the protocol rate (0.53 kg a.i. ha-1) had significant negative effects on annual bluegrass color and significantly more decrease on annual bluegrass population. Both creeping bentgrass and annual bluegrass color increased significantly with higher nitrogen rates and 24.4 kg N ha-1 had significantly more decrease on annual bluegrass population, which means higher nitrogen rates benefits creeping bentgrass more than annual bluegrass under methiozolin treatments. The third study found that there was no significant negative effects of methiozolin on creeping bentgrass color or lateral growth. According to the regression, there was a quadratic relation between creeping bentgrass color and time. The lateral growth rate of creeping bentgrass was constant through time and was only influenced by the nitrogen rate.
David S. Gardner (Advisor)
John R. Street (Advisor)
T. Karl Danneberger (Committee Member)
David J. Barker (Committee Member)
279 p.
Horticulture
methiozolin; nitrogen; annual bluegrass; creeping bentgrass; digital image analysis

Recommended Citations

Citations

  • Fang, C. (2015). The Effects of Methiozolin Rates and Nitrogen Fertility Strategies for Annual Bluegrass Control and Creeping Bentgrass Safety on Golf Greens [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1448982403

    APA Style (7th edition)

  • Fang, Chen. The Effects of Methiozolin Rates and Nitrogen Fertility Strategies for Annual Bluegrass Control and Creeping Bentgrass Safety on Golf Greens. 2015. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1448982403.

    MLA Style (8th edition)

  • Fang, Chen. "The Effects of Methiozolin Rates and Nitrogen Fertility Strategies for Annual Bluegrass Control and Creeping Bentgrass Safety on Golf Greens." Master's thesis, Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1448982403

    Chicago Manual of Style (17th edition)

osu1448982403
679
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