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Web URL(s):https://archive.lib.msu.edu/tic/ressum/2020/2020.pdf#page=171
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Author(s):Wherley, Benjamin; Bowling, Will; McInnes, Kevin; Provin, Tony; Segars, Chrissie
Author Affiliation:Texas A&M University, College Station, TX
Title:Long-term dynamics and management requirements of sand-capped fairways
Section:Integrated turfgrass management
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Ecophysiology: Soil problems
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Source:Turfgrass and Environmental Research Program: 2020 Research Summaries. 2020, p. 163-170.
Publishing Information:[New York, New York]: The United States Golf Association Green Section
# of Pages:8
See Also:Other Reports from this USGA research project: 2018-08-658
USGA Summary Points:Although traditional soil physical testing methods would suggest use of a 8 inch sand-cap based on the particle size distribution of this sand, the highest overall turf quality levels continue to be associated with shallower sand-capping treatment depths of 2 and 4 inches (6 to 7 out of 9, respectively). The 8 inch capping depth continues to produce lower turf quality levels, at times dropping to unacceptable levels (4 out of 9) (Fig. 1) The highest soil volumetric water contents within the upper sand-cap (0-3 in. depth) continue to be associated with topdressed over time (TD 2 in.) treatments (30% VWC). The 2 and 4 inch capping depths exhibit intermediate soil moisture levels (~18-19% VWC), while the 8 inch capping depth supports the least moisture (~13%). These data are very similar to those observed during the 2019 season. Although water droplet penetration time (WDPT) tests performed in previous years had shown moderate to severe hydrophobicity (at 0.5 depth) within the 8 inch sand-capping depth treatments, the 2020 data showed more widespread, but minimal levels of hydrophobicity across all capping depths (Fig. 3).. Based on data from subsoil SAR tests performed during October 2020, both gypsum treatments offered significant reductions in subsoil SAR (SAR = 10.1 and 9.6, respectively for 10 lbs. monthly and 100 lbs. annually) relative to the non-gypsum treatments (SAR=12.5). While statistically significant, these reductions may not be considered to be agronomically beneficial, and highlight the importance of additional strategies for mitigating subsoil Na accumulation. (Fig. 4) In this 3rd year of the clay loam subsoil study, secondary cultural management treatments did not lead to any statistically significant differences for any of the measured parameters (turf quality, soil volumetric water content, organic matter levels, surface hardness). (Data not shown) As with the sandy loam study, capping depth was primary driver of treatment differences in the clay loam cultural management study. Turf quality trended lower for the 8 capping depth, but sustained minimally acceptable quality levels for most of the season atop the clay loam subsoil (Figure 5). This was presumably due to lower permeability and higher water holding capacity of the clay loam relative to sandy loam subsoil (data not shown). This was also reflected in soil moisture level differences (Figure 6).
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
2020. Long-term dynamics and management requirements of sand-capped fairways. USGA Turfgrass Environ. Res. Summ. p. 163-170.
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    Last checked: 08/05/2021
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    Notes: Item is within a single large file
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