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Web URL(s): | http://usgatero.msu.edu/v05/n11.pdf Last checked: 06/05/2006 Requires: PDF Reader |
Publication Type:
| Report |
Author(s): | Chong, She-Kong;
Zhang, Anquan;
Boniak, Richard;
Huang, Yanhe;
Ok, C.-H. |
Author Affiliation: | Chong: Professor; Zhang: Graduate Research Assistant; Boniak: Ph.D.; Huang: Professor; Ok: Ph.D., Department of Plant, Soil and Agricultural Systems, Southern Illinois University, Carbondale, Illinois |
Title: | Saturated hydraulic conductivity of coarse-textured rootzone mixes |
Source: | USGA Turfgrass and Environmental Research Online. Vol. 5, No. 11, June 1 2006, p. [1-10]. |
Publishing Information: | Far Hills, NJ: United States Golf Association, Green Section |
# of Pages: | 12 |
Keywords: | TIC Keywords: Saturated hydraulic conductivity; Root zone mixture; Sand texture; Soil moisture; Porosity; USGA recommendations; Bulk density
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Abstract/Contents: | "The USGA recommendation for putting green construction require total porosity (Pt), air-filled porosity (Pa), and saturated hydraulic conductivity (Ksat) of the sand mix meet specific values in order to be qualified as a USGA green. Reports indicate that Ksat of the same material measured by different technicians and laboratories resulted in large variations that limit the utility of the data. The objective of this study was to develop a procedure for measuring Ksat of coarse-textured rooting mixes. Anew permeameter was developed. The saturation tank and permeameter was combined into a single system hence the soil column could be kept submerged in water at all times to avoid air re-entry into the sample. Soil-moisture-density curves of sand and sand mixes showed the optimum sand mix moisture content for packing the sample was between 0.06 and 0.07 g g-1. Research also indicated that if peat moss is used as an amendment, the application rate should not be more than 0.02 g g-1 of sand. In packing the soil column, the 3-layer approach as described in the Proctor's test, was adopted and modified for column construction. Both Ksat and bulk density of soil columns constructed by 1-, 2-, and 3-layer approaches were statistically evaluated. Results indicated that the 2- and 3-layer approaches not only could generate adequate firmness comparable to a severely compacted putting green, but also provide consistent and uniform soil columns for Ksat measurement. For practical purposes, the 2-layer approach was suggested for soil column construction in order to save time and labor. No differences were found in bulk density and Ksat between sand columns packed by either 1.32 or 3.02 kg hammers. Since a larger soil sample (76 mm in diameter) was suggested for measuring Ksat, the 3.02 kg hammer should be used in packing soil columns. The developed procedure was tested by laypersons using the same sand mix and the results showed only about 10% differences in Ksat compared to Ksat measured by technicians." |
Language: | English |
References: | 17 |
See Also: | Other Reports from this USGA research project: 2003-19-260 |
Note: | Summary as abstract Pictures, color Figures Tables Graphs |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Chong, S.-K., A. Zhang, R. Boniak, Y. Haung, and C.-H. Ok. 2006. Saturated hydraulic conductivity of coarse-textured rootzone mixes. USGA Turfgrass Environ. Res. Online. 5(11):p. [1-10]. |
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| Web URL(s): http://usgatero.msu.edu/v05/n11.pdf Last checked: 06/05/2006 Requires: PDF Reader |
| MSU catalog number: SB 433 .A1 A65 [online] |
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