Abstract
Experiments were conducted to determine the effects of selected biostimulants on St. Augustine turfgrass exposed to short-term periods of freezing temperatures, which are common in north-central Florida during March and April. Aqueous solutions of a triterpenic acid-rich extract from Siberian fir (Abiessibirica) [(TTA), 0 and 300 mg·L-1 a.i.], a seaweed (Ascophyllum nodosum) extract [(CSE), 30 mg·L-1 a.i.], acetylthioproline [(AP), 250 mg·L-1 a.i.], and amino levulinic acid [(5-ALA), 15 mg·L-1 a.i.] were sprayed on residential St. Augustine turfgrass about 50 hours prior to the forecasted freezing event. After freezing, the aesthetic quality of AP-treated St. Augustine turfgrass was the same as in untreated turfgrass plots, but it was drastically reduced in turfgrass treated with 5-ALA. In contrast, St. Augustine tufgrass aesthetic quality was higher in CSE- and TTA-treated plots than in untreated plots. These results indicate that CSE and TTA may help alleviate the negative effects of short-term exposure to freezing temperatures in St. Augustine turfgrass.
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