Influence of plant growth regulators on turfgrass growth, antioxidant status, drought tolerance

A series of studies were conducted to examine the antioxidant status, drought and disease tolerance, and growth response to foliar application of soluble seaweed (Ascophyllum nodosum) extracts (SE) and humic acid (HA; 25% active HA or 2.9% active HA) in tall fescue (Festuca arundinacea Schreb), Kentucky bluegrass (Poa pratensis L.) and creeping bentgrass (Agrostis palustris Huds.) grown under low (;Foliar application of humic acid (2.9% active HA) at 23.7 and 47.4 l ha;Drought stress induced an increase of antioxidants ;Foliar application of humic acid (25% active HA) at 5 l ha;The antioxidant SOD activity. photosynthetic capacity in terms of F...