Golf Course Management

AUG 2019

Golf Course Management magazine is dedicated to advancing the golf course superintendent profession and helping GCSAA members achieve career success.

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Page 69 of 107

66 GOLF COURSE MANAGEMENT 08.19 Figure 2. Iron sulfate stains can easily be seen on the soil surface when the canopy is thin, as it was during this grow-in. application of iron often results in increased greening of the plant. Previous tests of iron products on turf Iron may be supplied to turfgrass in sev- eral ways through the numerous iron prod- ucts available in the turf market. ose prod- ucts come in different forms, ranging from fine powder to granular to liquid. Over the past several years, approximately 14 stud - ies have been conducted at the University of Florida testing various iron products applied to turfgrass. e results of these studies were consistent and were based on the form of iron used. For example, turfgrass treated with granular iron did not respond in any of the studies, whereas turfgrass treated with the same iron source in a foliar application re - sponded with increased turf greening. ese different responses lead one to ask, "Why? If turfgrass responds to liquid iron applied to the leaves, shouldn't it respond to the same iron applied as a soluble granule to the soil?" In some cases, the results of granular iron applications may be considered undesirable. Small orange/reddish dots are often observed on cart paths and sidewalks (Figure 1). ese stains are the telltale sign of granular iron sulfate that was not removed from the con - crete surface and subsequently came into contact with water. e stains are the result of the iron oxidizing into iron oxide, which is the same thing as rust that forms on metal. Interestingly, the same reaction occurs on the soil surface but generally goes unnoticed be -

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