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| Web URL(s): | https://gsrpdf.lib.msu.edu/?file=/1960s/1962/621129.pdf
Last checked: 01/24/2017
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Professional |
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| Content Type: | Q & A |
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| Corporate Author(s): | USGA Green Section |
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| Title: | [USGA greens drainage] |
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| Section: | Questions frequently asked
Other records with the "Questions frequently asked" Section
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| Source: | USGA Journal and Turf Management. November 1962, p. 29-30. |
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| Publishing Information: | New York: United States Golf Association |
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| # of Pages: | 2 |
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| Question: | "In greens constructed according to USGA Green Section specifications, does all the free moisture drain when the "dumping phenomenon" occurs? Why?" |
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| Answer/Response: | "Yes. To answer why, one should recall the incidents leading to the formation of the false water table initially. In general, they are as follows: (a) The water enters the seedbed from the surface and fills all the micropores; at this point the soil near the surface reaches field capacity. (b) While the micropores are filled near the surface, many micropores also are filled for short periods of time. This process continues downward until all the soil is wet down to the sandgravel interface which is underlying the permeable seedbed. (c) Surface tension of the water holds the free water against the force of gravity (the only force attracting the water downward). (d) As water accumulates, a column is formed. When it becomes high enough so that its weight overcomes the ability of surface tension to retain the free water, the interface is then penetrated; and like sheep through a weak fence, each water molecule follows its leader until all the macropores have emptied. When this occurs, the seedbed is at field capacity– the driest it can become due to downward drainage alone. The remaining moisture will be removed either by transpiration or evaporation. One superintendent stated he can irrigate until the point just prior to the "dumping phenomenon;" and after applying a small additional amount of water, much more is drained out than that additional amount added. The question then arose, "If he is so good, why does he need the gravel and sand layers?" He could not do this without the gravel and sand layers under a seedbed of given permeability." |
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| Keywords: | TIC Keywords: USGA recommendations; Soil moisture; Golf greens; Drainage; Excess water removal
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| Language: | English |
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| References: | 0 |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
USGA Green Section. 1962. [USGA greens drainage]. USGA J. Turf Manage. p. 29-30. |
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| Web URL(s):
https://gsrpdf.lib.msu.edu/?file=/1960s/1962/621129.pdf
Last checked: 01/24/2017
Requires: PDF Reader
Notes: Item is within a single large file |
| 
MSU catalog number: SB 433.15 .U84 |
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