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Sand Topdressing Applications Improve Shear Strength and Turfgrass Density on Trafficked Athletic Fields

机译:追沙应用可提高交通田间的剪切强度和草皮密度

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Drain tile installation into a native-soil athletic field and subsequent sand topdressing applications are cost-effective alternatives to complete field renovation. However, if cumulative topdressing rates exceed root system development, surface stability may be compromised. The objective of this research was to evaluate the effects of cumulative topdressing, over a compacted sandy loam soil, on the fall wear tolerance and surface shear strength of a kentucky bluegrass (Poa pratensis)-perennial ryegrass (Lolium perenne) stand. Research was initiated in East Lansing, MI, on 10 Apr. 2007. A well-graded, high-sand-content root zone (90.0% sand, 7.0% silt, and 3.0% clay) was topdressed at a 0.25-inch depth [2.0 lb/ft(2) (dry weight)] per application, providing cumulative topdressing depths of 0.0, 0.5, 1.0, 1.5, or 2.0 inches applied from 11 July to 15 Aug. 2007. Fall traffic was applied twice weekly to all treatments from 10 Oct. to 3 Nov. 2007. In 2008, topdressing applications and traffic, as described earlier, were repeated on the same experimental plots. Results obtained from this research suggest that the 0.5-inch topdressing depth applied over a 5-week period in the summer will provide improved shoot density and surface shear strength in the subsequent fall. Results also suggest that topdressing rates as thick as 4.0 inches accumulated over a 2-year period will provide increased shoot density, but diminished surface shear strength.
机译:将排水砖安装到天然土壤运动场中,以及随后的砂面追施应用是完成场地翻新的经济高效的替代方案。但是,如果累积的追肥率超过了根系发育水平,则表面稳定性可能会受到损害。这项研究的目的是评估在密实的沙壤土上累积的追肥对肯塔基州蓝草(Poa pratensis)-多年生黑麦草(Lolium perenne)林分的耐秋季磨损性和表面剪切强度的影响。研究于2007年4月10日在密西根州的东兰辛开始。在0.25英寸深度处追肥了一个渐变好,含沙量高的根部区域(90.0%的沙子,7.0%的淤泥和3.0%的粘土)[每个应用2.0 lb / ft(2)(干重)],从2007年7月11日至8月15日施加的累积追肥深度为0.0、0.5、1.0、1.5或2.0英寸。秋季跌倒流量每周两次应用于所有处理从2007年10月10日至11月3日。2008年,在同一实验区重复进行了如前所述的追肥应用和交通。从这项研究获得的结果表明,夏季5周内施加的0.5英寸追肥深度将在随后的秋季提供更高的枝条密度和表面剪切强度。结果还表明,在2年的时间内累积的追肥速率高达4.0英寸,可以增加枝条密度,但降低表面剪切强度。

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