Physical properties of sports turf rootzones modified with organic fibers

The rootzones of athletic fields are often built of sand for the benefit of improved drainage. Sand-based rootzones often have stability issues if the turfgrass is not fully established. The use of inorganic fibers to stabilize rootzone may create disposal and environmental issues. Previous work showed that undecomposed organic fibers such as wheat (Triticum aestivum L.) straw could stabilize sand rootzones without causing negative effect and organic matter (OM) buildup. The primary objective of this study was to evaluate the physical properties of sand rootzones modified with 1% (w/w) peat, wheat straw, coconut (Cocos nucifera L.) coir, and recycled cotton (Gossypium hirsutum L) fiber, and 2% peat. The study was conducted in field plots during 2017 and 2018. The results showed that OM content in all treatments with 1% organic fiber was comparable with that amended with 1% peat. Coconut coir and wheat straw at 1% showed similar soil moisture, water infiltration, turfgrass shoot density, and ball bounce to the values in the 1% peat treatment. The sand rootzone modified with 1% recycled cotton had lower shoot density and soil moisture than the other treatments, despite its higher infiltration rate. All rootzones modified with 1% organic fiber showed accelerated water infiltration during the 6-mo period following rootzone construction and Kentucky bluegrass (Poa pratensis L.) establishment. In conclusion, wheat straw presented physical properties similar to or better than peat.