SportsTurf

January 2018

SportsTurf provides current, practical and technical content on issues relevant to sports turf managers, including facilities managers. Most readers are athletic field managers from the professional level through parks and recreation, universities.

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www.spor tsturfonline.com 10 // January 2018 1 represents completely dead or brown turf, 9 represents the highest possible turfgrass quality, and 6 represents minimally acceptable turfgrass quality. Weeds were evaluated at six randomly selected locations in each fi eld and then averaged. Agronomic responses In general, the three fertilized treatments have maintained turfgrass quality around the minimally acceptable level, sometimes rising above, other times dipping just below. However, the fi eld that has been neglected (mowed only) slowly declined from a visual quality of 5 to 4 over the past three seasons. These results suggest that the three fertilization strategies are capable of producing approximately equal and acceptable turfgrass quality. The mowing only treatment has demonstrated that fertilization is a necessary step for maintaining acceptable quality. Weed percentages were relatively low at all fi elds near the beginning of the study. A decline in weed population was observed in 2015 for all but the neglected fi eld (a conventional herbicide was accidentally applied to the organic fi eld in 2015). Weed populations rose in 2016, a season that saw no fertilizer or herbicide applications on any of the fields. In 2017, weed populations declined in the standard and UW Integrated fi elds, while rising sharply in the organic fi eld. In July 2017, weed populations were <10% in the herbicide treated fi elds and 40-55% in the Organic and Mowing Only Programs. In conclusion, we found that all three fields treated with fertilizer produced acceptable turfgrass quality for the majority of the study period. Weed populations were kept below 20% for the two treatments using herbicides. Weeds were highest in the mowing only program, followed by the organic management program, which saw substantial weed encroachment in 2017. This finding highlighted that weed encroachment cannot be managed by maintaining adequate fertility alone at this site. Environmental hazard analysis The Environmental Impact Quotient (EIQ) and Hazard Quotient are two formulas using toxological data to provide quasi- quantitative estimates of the environmental Table 2. Application Data for 2015. Field# Management Program Fertilization Herbicide FIELD 1 Organic Chick Magic Organic Fertilizer (5-3-0) 1.5 lbs N/1000 sq. ft • 40% soluble nitrogen • 60% slow release nitrogen Liquid 17-0-5, and Granular 25-0-5* 1.5 lbs N/1000 sq. ft. • 100% quick release nitrogen TruePower 3* FIELD 2 City of Stoughton Liquid 17-0-5, and Granular 25-0-5 1.5 lbs N/1000 sq. ft • 100% quick release nitrogen TruePower 3 FIELD 3 Integrated Turfgrass Management Spread-It and Forget-It Fertilizer (35-0-10) 1.5 lbs N/1000 sq. ft. • 20% soluble nitrogen • 80% slow release nitrogen Confront FIELD 4 Mowing Only None None * These applications were made by mistake and were not factored into the estimated cost of the application, but obviously infl uenced the agronomic outcomes. Table 3. Application Data for 2017. Field# Management Program Fertilization Herbicide FIELD 1 Organic Milorganite (5-2-0) 2.0 lbs N/1000 sq. ft. • 15% soluble nitrogen • 85% slow release nitrogen None FIELD 2 City of Stoughton Granular (25-0-5) 2.0 lbs N/1000 sq. ft.* • 66% soluble nitrogen • 33% slow release nitrogen Millennium Ultra 2 Dimension Ultra 40wp FIELD 3 Integrated Turfgrass Management Spread-It and Forget-It Fertilizer (35-0-10) 1.5 lbs N/1000 sq. ft. • 20% soluble nitrogen • 80% slow release nitrogen Confront FIELD 4 Mowing Only None None * This application was split between two dates in 2017 An aerial view of the four fields at Racetrack Park.

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