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| Web URL(s): | http://archive.lib.msu.edu/tic/rpr/1988/14549,%20U%20Nebraska, Shearman.PDF
Last checked: 04/29/2014
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Material Type: | Manuscript |
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| Monographic Author(s): | Shearman, Robert C. |
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| Author Affiliation: | Department of Horticulture, University of Nebraska - Lincoln |
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| Monograph Title: | Turfgrass Culture and Water Conservation: [1988 Annual Research Report], 1988. |
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| Publishing Information: | Lincoln, Nebraska: Department of Horticulture, University of Nebraska |
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| # of Pages: | 14 |
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| Collation: | 13, [1] pp. |
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| Abstract/Contents: | "During 1988, studies were conducted on creeping bentgrass water use rates, root growth, root distribution, topgrowth, verdure, clipping to verdure ratio, and wear tolerance. Studies were intiated to evaluate the effects of mowing height and vertical mowing frequency on creeping bentgrass putting green quality and rooting characteristics. A study was initiated to observe the effects of syringing on creeping bentgrass putting green quality, root growth and stress tolerance. A study was initiated to determine the interactive effects of mowing, nitrogen, clipping removal or return, and irrigation frequency on creeping bengrass competition with annual bluegrass under fairway conditions. In addition, two fairway studies were initiated to determine the interactive effects of potassium nutrition and irrigation level on both Kentucky bluegrass and perennial ryegrass fairways. Creeping Bentgrass Water Use Rates. Ten creeping bentgrass cultivars were evaluated for water use under field conditions. Water use rates varied from a low of 3.2 mm for Pennlinks on 22 May 1987 to a high of 10.7 mm on 25 June 1987 for Seaside. In 1988, Pennlinks had a low water use of 3.5 mm on 3 Oct. and a high of 8.5 mm on 11 June, while Seaside ranged from a low of 4.3 mm on 3 Oct. to a high of 9.9 mm on 10 and 11 June. Seaside was the cultivar with the highest water use rate, while Pennlinks consistently had the lowest during the two year study. Water use among the 10 cultivars varied from 16% to 28% with a mean of 20%. Cultivar selection could be used to account for a 20% reduction in water use. These results also indicate a strong potential to breed and select cultivars with lower water use rates. Creeping Bentgrass Growth and Development. Ten creeping bentgrass cultivars were studied for topgrowth, clipping yield, verdure, and clipping yield to verdure ratio. Cultivars differed in topgrowth by as much as 24%. Clipping yields varied by 31%. Verdure varied by 18%. Clipping yield was positively correlated (r=0.83) and verdure was negatively correlated (r=-0.79) to cultivar water use rates. Clipping yield to verdure ratios varied from 0.7 for Pennlinks to 1.3 for Seaside. Cultivars with ratios of less than 1.0 had intermediate to low water use rates while those with ratios of 1.0 or greater had intermediate to high water use rates. Topgrowth characteristics of clipping yield and verdure could be used as selection criteria for cultivars with reduced water rates. Creeping Bentgrass Root Growth and Distribution. Creeping bentgrass cultivars varied in total root production by 31%. Pennlinks produced the greatest root growth and Penneagle produced the least. Cultivars varied in their root distribution. Five cultivars produced root growth to depths of 750 mm, while two cultivars produced roots only to 450 mm. Emerald, Prominent and Penneagle had 90%, 85%, and 87% of their root growth in the upper 300 mm, respectively. These results demonstrate that creeping bentgrass cultivars could be selected or developed with improved root production and distribution. Cultivars with low water use rates and with the ability to redistribute their root systems in the soil profile as surface soil moisture is depleted are feasible to develop within creeping bentgrass. Creeping Bentgrass Wear Tolerance. Creeping bentgrass wear tolerance as influenced by cultivar and nitrogen nutrition were evaluated. Cultivars differed in wear tolerance; however, there was a cultivar x nitrogen interaction for wear tolerance. In most cultivars, wear tolerance increased as nitrogen nutrition increased from 2.0 to 4.0 lbs/100 sq ft/growing season and declined from 2.0 to 6.0 lbs/100 sq ft/growing season but wear tolerance for Penneagle increased linearly with rates of nitrogen from 2.0 to 6.0 lbs/100 sq ft/growing season. Turfgrass wear tolerance was positively correlated to cultivar verdure density (r=0.80). Wear injury recovery varied among cultivars, but all cultivars recovered better as nitrogen rate was increased from 2.0 to 6.0 lbs/100 sq ft/growing season. New Investigations. New investigations have been initiated in late 1988. These investigations involve cultural practice interactions on putting green and fairway turfgrass quality, playability and stress tolerance. Three graduate students have been hired to serve as project leaders in these investigations. These students include: K. S. Erusha, T.A. Salaiz, and K. N. Kim. Results of their work will be forth coming in 1989." |
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| Language: | English |
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| References: | 0 |
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| See Also: | See also related summary article "Turfgrass cultural practices and their interactive effects on rooting" 1988 Turfgrass Research Summary [USGA/GCSAA], 1988, p. 22, R=14549. R=14549 |
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| Note: | "USGA Progress Report - 1988"
"A USGA/GCSAA/University of Nebraska Research Project Initiated in 1984"
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
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Last checked: 04/29/2014
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