Full TGIF Record # 18059
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Web URL(s):https://listings.lib.msu.edu/iowat/1989.pdf#page=68
    Last checked: 01/10/2017
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Publication Type:
i
Report
Author(s):Spear, G. T.; Christians, N. E.
Title:1988 NBPT Test
Source:1989 Iowa Turfgrass Research Report. July 1989, p. 64-68.
Publishing Information:Ames, Iowa: Iowa State University
Keywords:TIC Keywords: N-butyl phosphorothioic triamide; Urea; Growth rate; Poa pratensis; Dry conditions; Granular fertilizers; Phytotoxicity; Heat stress; Application rates; Color evaluation; Clipping weight; Soil amendments; Urea hydrolysis
Abstract/Contents:Study to test the effects of N-(n-Butyl) thiophosphoric triamide (NBPT) treated granular urea from Enichem Americas versus untreated urea on Kentucky bluegrass in hot, dry weather. Observations included both color quality and tipburn that may result from application of the fertilizers at varied rates. Also, clipping dry weights were measured periodically to compare growth following the treatments. The turf used in the study had been established on a Nicollet (Aquic Hapludoll, fine-loamy, mixed mesic) soil (pH 7.5, 2.3% organic matter) with Park Kentucky bluegrass (Poa pratensis L.). The investigation was conducted in 1988. The turf was irrigated regularly to prevent drought stress. Experimental units were 5 ft by 5 ft each with three replications of seven different treatments. The study was arranged in a randomized, complete-block design with two treatments and repeated menasurements on the same plot areas in three replications. The treatments included granular urea applied at 1 lb N/1000 ft2 (49 kg N/ha) and 1.5 lb N/1000 ft2 (73 kg N/ha) with NBPT at 0, 0.25, and 0.5% of the weight of N. No urea was applied to the control treatments. The treatments were initially applied the last week of May and were repeated the third week of July. Color and tipburn ratings were taken weekly following the treatments, until symptoms ceased. Clipping weights were recorded weekly, as growth conditions permitted, at a 2 in (5 cm) mowing height. Results are provided in tables. The effect of NBPT on turf color and the occurrence of tipburn varied with the NBPT rate. Treatment effects were fairly consistent between both applications and among weeks following the treatment. Color ratings of the NBPT treatments were not different from the corresponding urea treatments and tipburn was greater in plots that received the NBPT treatments. Clipping yield was not affected by NBPT. Clipping yeild decreased steadily in the weeks following application of treatments but relative treatment effects remained constant throughtout the study.
Language:English
References:4
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Spear, G. T., and N. E. Christians. 1989. 1988 NBPT Test. Iowa Turfgrass Res. Rep. p. 64-68.
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https://listings.lib.msu.edu/iowat/1989.pdf#page=68
    Last checked: 01/10/2017
    Requires: PDF Reader
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MSU catalog number: SB 433 .A1 I55
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