| Abstract/Contents: | "This study was conducted on a mature stand of creeping bentgrass (Agrostis stolonifera) and annual bluegrass (Poa annua) at the Valentine Turfgrass Research Center, Penn State Univ., University Park, PA. The objective of the study was to determine the efficacy of plant growth regulators and bio-stimulants by color ratings and determinations of plant height and foliar yield. This study was a randomized complete block design with three replications. All treatments were applied on June 5, June 19, July 16, July 31,2002 using a three foot C2 powered boom sprayer calibrated to deliver 40 gpa using two, flaat fan, 11004 nozzles at 40 psi. The test site was maintained similar to that of a golf course putting green with respect to irrigation, fertilization and mowing. Turfgrass height was measured using a Turfcheck 1 prism. After the June 5 application date Coron was substituted for ammonium sulfate as a nitrogen source as the ammonium sulfate caused significant phytotoxicity. At no time did color ratings reveal that treated turf was in an unacceptable condition after switching the nitrogen source to Coron. However, on June 10, turf treated with Primo Maxx, Kick, Potent-Sea, N-Hance, Base One, and Coron teneded to have poorer color than untreated turf. Throughout the course of the study, there was consistent tendency for turf that was treated with all materials to have color better than the untreated control. On some dates, significant differences were found for height measurements. For example, on June 10, turf treated with Primo Maxx, Kick, Potent-Sea, N-hance, Base One and Coron tended to have poorer color than untreated turf. Throughout the course of the study, there was a consistent tendency for turf that was treated with all materials to have color better than the untreated control. On significant dates, significant differences were found for height measurements. For example, on June 10, turf treated with Primo Maxx, Astron, and Coron; Primo Maxx, Kick, Potent-Sea, N-Hance, Base One, and Coron; Primmo Maxx, MacroSorb Foliar, and Coron; Primo Maxx and Coron; Primo Maxx and Gary's Green 18-34; and Primo Maxx, Gary's Green 18 3-4, and Gary's Green PK Plus 3-21-18 had lower height than untreated turf. However, by June 24 turf treated with Primo Maxx, Kick, Potent-Sea, N-Hance, Base One, and Coron was found to have a height higher than untreated turf. On July 8, turf treated with Primo Maxx was shorter than untreated turf and turf that had received Coron and Gary's 18-3-4 with Primo Maxx. On July 16, only turf treated with Primo Maxx was shorter than untreated turf. The other two dates on which a treated turf was found to have a height difference from the untreated turf was on August 12. On this date, turf treated with Primo Maxx plus Coron was shorter than the untreated turf. However, on August 19, the reverse response was found. With exception of turf treated with Coron or that treated with Primo Maxx and Gary's Green 18-3-4, all other treated turf had lower clipping yields than untreated turf on June 10, 17 and 24. By July 1, only turf treated with Primo Maxx; Primo Maxx, Astron and Coron; Primo Maxx and Coron; and Primo Maxx, Gary's Green 18 3-4 plus Gary's PK 3-21-18 had lower clipping yields. On July 8, only turf treated with Coron alone and that treated with Primo Maxx, Kick, Potent-Sea, N-Hance, Base One and Coron had clipping uields similiar to the untreated check, all other treatments caused siginificantly lowe clipping yields. On July 16, no treatments caused significantly lower yields than untreated turf, however, turf treated wit Primo Maxx, alone had less yield than turf treated with Coron alone. On July 22, only turf treated with Coron and Primo Maxx with Gary's Green 18-3-4 plus Gary's PK Plus 3-21-8 had yields similiar to the untreated turf. all other treated turf had lower yields than the treated turf. On Aug.5, turf treated with Primo Maxx had less clipping yield than the untreated turf. In addition, turf treated Primo Maxx, Kick, Potent-Sea, Kick, N-Hance, Base One, and Coron; Primo Maxx, MacroSorb Foliar, and Coron; and Coron alone. On August 12 ,only turf treated with Primo Maxx, had less yield than untreated turf. By Aug.19, turf treated with Primo Maxx, Kick, Potent-Sea, N-Hance, Base One, and Coron; Primo Maxx, MacroSorb Foliar, and Coron; Primo Maxx plus Coron; and Primo Maxx, Gary's Green 18-3-4, and Gary's PK Plus 3-21-18, had yields that were significantly higher than untreated turf." |
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