Abstract
AbstractLimited information is available on the effect of fertility and chemical management under drought conditions. A study investigated the effects of the plant growth regulator trinexapac‐ethyl (TE; applied at 1.6 L ha−1 month−1) and the soil surfactant Revolution® (applied at 20 L ha−1 month−1) on Princess 77 bermudagrass (Cynodon dactylon L. Pers). The experiment included two reference evapotranspiration replacement levels (ETo) of 45% and 75% combined with a 2 × 2 factorial of N (23 and 45 kg N ha−1 month−1 and Fe (0 and 2 kg Fe ha−1 month−1) fertility levels. At 75% ETo, turfgrass quality remained above acceptable levels (6.7), with the lowest quality observed in control plots receiving low N without iron. Normalized difference vegetation index (NDVI) was higher at 75% ETo, but plots receiving TE with high N and no iron and irrigated at 45% ETo had NDVI values similar to plots irrigated at 75% ETo. Under drought conditions (45% ETo), 14 out of 16 treatment combinations maintained acceptable turfgrass quality, except for the control with low N and iron (5.7) and Revolution® with high N but no iron (5.4). Overall, the results suggest that TE plus/or ad soil surfactants may improve turfgrass quality and NDVI under drought conditions.
Published Version
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