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| Web URL(s): | https://dl.sciencesocieties.org/publications/aj/pdfs/91/2/AJ0910020344
Last checked: 12/14/2016
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| Publication Type:
| Refereed |
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| Author(s): | Young, William C. III;
Chilcote, David O.;
Youngberg, Harold W. |
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| Author Affiliation: | Department of Crop and Soil Sciences, Oregon State University, Corvallis, OR 97331-3002 |
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| Title: | Chemical dwarfing and the response of cool-season grass seed crops to spring-applied nitrogen |
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| Section: | Forages & turfgrass
Other records with the "Forages & turfgrass" Section
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| Source: | Agronomy Journal. Vol. 91, No. 2, March/April 1999, p. 344-350. |
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| Publishing Information: | Madison, WI: American Society of Agronomy |
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| # of Pages: | 7 |
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| Keywords: | TIC Keywords: Cool season turfgrasses; Nitrogen fertilization; Spring; Fertilization timing; Seed yield; Festuca rubra subsp. commutata; Festuca arundinacea; Dactylis glomerata; Fertilization rates; Paclobutrazol; Growth regulators; Application rates; Growth; Dry weight; Tillers (vegetative); Seed production; Seed weight; Florets; Spikelets
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| Abstract/Contents: | "Seed yield response of cool-season grasses to spring-applied N is usually limited because of lodging. This study investigated whether chemical dwarfing of these crops improves their seed yield response to spring-applied N. Chewing's fescue [Festuca rubra L. subsp. fallax (Thuill.) Nyman; syn. F. rubra var. commutata Gaudin], tall fescue (Festuca arundinacea Schreb.), and orchardgrass (Dactylis glomerata L.) were established in September 1983 near Corvallis, OR. Treatments were all combinations of 90, 120, 150, 180, and 210 kg N ha⁻¹ applied at the double-ridge stage of development, followed by paclobutrazol [(2RS,3RS)-1-(4-chlorophenyl)-4,4-dimethyl-2(1H-1,2,4- triazol-1-yl)-pentan-3-ol] at 0, 0.25, 0.5 and 1 kg a.i. ha⁻¹ applied at floret initiation stage in 1985 and 1986. Averaged across years and N rates, the 1 kg ha⁻¹ rated reduced Chewing's fescue height by 23% and tall fescue and orchardgrass heights by 30%. In the absence of paclobutrazol, Chewing's fescue and tall fescue seed yields were the greatest at 90 kg N ha⁻¹. Paclobutrazol did not affect seed yield response of Chewing's fescue to N rates, but tall fescue seed yield in 1986 was the greatest at 150 kg N ha⁻¹ when only 0.25 kg a.i. paclobutrazol ha⁻¹ was applied. Averaged across N rates, the 0.5 kg ha⁻¹ rate increased Chewing's fescue seed yield by 32% in 1985 and 18% in 1986 and also increased tall fescue by 32% in 1985 and 23% in 1986. Orchardgrass seed yield was the greatest at 180 kg N ha⁻¹ in both years. Paclobutrazol did not affect orchardgrass seed yield in 1985, and the 1 kg ha⁻¹ rate decreased seed yield in 1986. We concluded that in western Oregon paclobutrazol application at floret inititation does not improve seed yield response of these crops to spring-applied N, but it would significantly improve Chewing's fescue and tall fescue seed yield, regardless of the N rate applied. Results did not indicate any advantage for applying paclobutrazol on orchardgrass seed crop." |
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| Language: | English |
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| References: | 21 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Young, W. C. III, D. O. Chilcote, and H. W. Youngberg. 1999. Chemical dwarfing and the response of cool-season grass seed crops to spring-applied nitrogen. Agron. J. 91(2):p. 344-350. |
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| Web URL(s):
https://dl.sciencesocieties.org/publications/aj/pdfs/91/2/AJ0910020344
Last checked: 12/14/2016
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: S 22 .A45 |
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