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Abstract
ABSTRACT
Laboratory and greenhouse studies were conducted to investigate the impacts of selected wetting agents (WAs), plant growth regulators (PGRs), and biological products (BPs) on turf quality and soil biological health using soil respiration, phosphatase activity, and urease activity as indicators of soil biological health. Disease suppressive nature of soil following the application of these treatments was investigated by inoculating grass with Dollar spot (Clarireedia spp. formerly Sclerotinia homoeocarpa) pathogen. In the Laboratory study, among WAs, Sixteen 90 and Duplex enhanced soil respiration whiles Vivax and Magnus suppressed it. Urease activity was enhanced by Vivax, Fleet, Magnus and Sixteen 90. Phosphatase activity was enhanced by only Dispatch. Among PGRs, Anuew, Cutless, and Proxy enhanced soil respiration, phosphatase and urease activity respectively. BPs did not significantly impact the variables of this study. In the Greenhouse study, among WAs, Vivax, Fleet, Magnus, and Dispatch enhanced soil respiration whereas phosphatase and urease were not significantly impacted by WAs. In the Greenhouse study, among PGRs, Cutless, Trimmit, and Anuew suppressed soil respiration. None of BPs significantly impacted the variables of this study in the Greenhouse. Turf quality was significantly improved by WAs, Revolution, Cascade, Pervade, and Sixteen 90, 7 weeks after treatment whiles Kapre Reme NSL, a BP also improved turf quality. Disease suppressive nature of soil was not significantly improved by any treatment.
Laboratory and greenhouse studies were conducted to investigate the impacts of selected wetting agents (WAs), plant growth regulators (PGRs), and biological products (BPs) on turf quality and soil biological health using soil respiration, phosphatase activity, and urease activity as indicators of soil biological health. Disease suppressive nature of soil following the application of these treatments was investigated by inoculating grass with Dollar spot (Clarireedia spp. formerly Sclerotinia homoeocarpa) pathogen. In the Laboratory study, among WAs, Sixteen 90 and Duplex enhanced soil respiration whiles Vivax and Magnus suppressed it. Urease activity was enhanced by Vivax, Fleet, Magnus and Sixteen 90. Phosphatase activity was enhanced by only Dispatch. Among PGRs, Anuew, Cutless, and Proxy enhanced soil respiration, phosphatase and urease activity respectively. BPs did not significantly impact the variables of this study. In the Greenhouse study, among WAs, Vivax, Fleet, Magnus, and Dispatch enhanced soil respiration whereas phosphatase and urease were not significantly impacted by WAs. In the Greenhouse study, among PGRs, Cutless, Trimmit, and Anuew suppressed soil respiration. None of BPs significantly impacted the variables of this study in the Greenhouse. Turf quality was significantly improved by WAs, Revolution, Cascade, Pervade, and Sixteen 90, 7 weeks after treatment whiles Kapre Reme NSL, a BP also improved turf quality. Disease suppressive nature of soil was not significantly improved by any treatment.