Full TGIF Record # 18061
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Web URL(s):https://listings.lib.msu.edu/iowat/1989.pdf#page=74
    Last checked: 01/10/2017
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Publication Type:
i
Report
Author(s):Agnew, M. L.; Christians, N. E.; Moore, R. W.
Title:Summer Slow-Release Nitrogen Sources Comparison Study
Source:1989 Iowa Turfgrass Research Report. July 1989, p. 70.
Publishing Information:Ames, Iowa: Iowa State University
Keywords:TIC Keywords: Fertilizer analysis; Slow-release fertilizers; Summer; Poa pratensis; Visual evaluation; Shoot density; Application timing; Nitrogen fertilizers
Abstract/Contents:Study to determine the effect of late spring and summer fertilization with 8 slow-release nitrogen (N) sources on visual quality and shoot density. Study was initiated in the spring of 1985 and will be terminated in the spring of 1989. The turf is Glade kentucky bluegrass, established in September 1984. In all years except 1988, the turf was watered to prevent drought stress. Periodic drought stress was allowed during the drought of 1988. Individual treatment cells measured 5 ft by 5 ft and were randomized in a complete-block design with three replications. The turf was mowed at 2 in and preemergence herbicides were used to prevent crabgrass. Treatments included eight slow-release N sources applied at 2 lb N/1000 ft2/season of urea (46-0-0) split into two equal applications on April 10 and September 20. One additional treatment, using combinations of Powder Blue and urea, was applied for comparison. This treatment applied 0.25 lb N(Powder Blue)/0.75 lb n (urea) in April and September, and 0.5 lb N(Powder Blue)/0.5 lb N (urea) in May and August. The N-Sure treatments began in 1986, while all other treatment began in 1985. Visual quality data were taken on May 5, May 25, June 27, July 24, and October 19, 1988. Water was withheld from plots during August and early September. visual quality ratings and shoot density results are provided in a table with least significant difference values. Data taken on May 25, June 27, and July 24, reflect the spring application of fertilizers. In this case, all treatments responded equally. Following the drought, the Powder Blue/urea treatment provided the best quality, while there was little or no difference between other fertilizer sources. Thatch depth and quality will be measured in the spring of 1989, after which time this study will be terminated. A new fertilizer trial comparing fertilizer sources and programs is planned for the spring of 1989.
Language:English
References:0
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Agnew, M. L., N. E. Christians, and R. W. Moore. 1989. Summer Slow-Release Nitrogen Sources Comparison Study. Iowa Turfgrass Res. Rep. p. 70.
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https://listings.lib.msu.edu/iowat/1989.pdf#page=74
    Last checked: 01/10/2017
    Requires: PDF Reader
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MSU catalog number: SB 433 .A1 I55
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