Sportsmaster CRF 19 19 5 This excellent product, which you can use at the beginning of the season, will bring your turf to life. Thanks to Sportsmaster CRF 19 19 5, your turf will respond quickly, no matter how cold the weather, thanks to its nitrogen-rich content. Sportsmaster CRF 19 19 5 supports balanced and healthy growth from the first day of application without fluctuations in nutrient release.