Golf courses and sports fields with turfgrass surfaces have been moving toward sand‐based root zone construction to enhance playability. Sand‐capped systems are ideally suited for situations where poor water quality and/or clayey soils necessitate rapid drainage and the need to flush salts. This study evaluated sand‐capping depth and subsoil texture on dynamics and availability of water as well as subsequent turf canopy and rooting characteristics. Objectives of this study were (a) to assess season‐long turf performance and root distribution of ‘Tifway’ hybrid bermudagrass (Cynodon dactylon × C. transvaalensis Burt. Davy) turf established on various sand‐cap depths (0–5 cm topdressed over 2 yr or 5, 10, or 20 cm) atop two subsoils (fine sandy loam or clay loam) and (b) to determine how sand‐capping × subsoil combinations influence required irrigation frequency (1 vs. 2 d wk⁻¹ at 0.6 × reference evapotranspiration) and soil moisture dynamics. Irrigation frequency had minimal effect on percent green cover during the entire study period. Root mass detected within the underlying 30‐cm subsoil was inversely proportional to sand‐cap depth. Turf performance during the study was primarily affected by capping depth and subsoil, suggesting that playing surfaces can be negatively affected if the wrong capping depth is chosen in the construction of sand‐capped turfgrass systems.

中文翻译：

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覆砂深度和底土对“ Tifway”百慕大草对灌溉频率和干旱的响应的影响

具有草皮表面的高尔夫球场和运动场已朝着以沙子为基础的根部区域建设，以提高可玩性。沙封系统非常适合水质差和/或粘土质的土壤需要快速排水并需要冲洗盐的情况。这项研究评估了砂层深度和下层土壤质地对水的动力和可用性以及随后的草皮冠层和生根特性的影响。这项研究的目的是（a）评估'Tifway'杂交百慕大草（Cynodon dactylon × C. transvaalensis）的整个季节草皮性能和根系分布伯特 戴维（Davy）草皮在两个底土（细砂壤土或黏土壤土）顶部的各种沙层深度（2年或5、10或20厘米的0-5 cm地表土上）上建立，并且（b）确定如何进行砂土覆盖×下层土壤的组合会影响所需的灌溉频率（0.6×参考蒸散量下的1相对2 d wk ^-1）和土壤水分动态。在整个研究期间，灌溉频率对绿色覆盖率的影响最小。在下层30 cm的底土中检测到的根质量与沙帽深度成反比。在研究过程中，草皮性能主要受覆盖深度和下层土壤的影响，这表明，如果在覆砂草皮草体系的构建中选择了错误的覆盖深度，则会对比赛场地产生负面影响。