Full TGIF Record # 65522
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Publication Type:
Author(s):Goatley, Mike Jr.
Author Affiliation:Assistant Professor of Agronomy, Mississippi State University
Title:Warm-season turfgrass rooting responses to biostimulators
Meeting Info.:July 16, 1991
Source:Mississippi State Turfgrass Field Day. 1991, p. 7-13.
# of Pages:7
Publishing Information:[Mississippi State: Mississippi State University]
Keywords:TIC Keywords: Cynodon; Zoysia japonica; Eremochloa ophiuroides; Biostimulants; Sod rooting; Sod establishment; Root strength; Sod; Stress response; Shade; Rooting; Shade resistance
Abstract/Contents:This report focuses on four major topics: Monthly biostimulator applications study; Bermudagrass rooting in the shade; Bermudagrass squares treated with biostimulator after sod harvest; and Greenhouse studies with biostimulator applications to bermudagrass. Established Cynodon dactylon X transvaalensis v. Tifway, Eremochloa ophiuroides v. common and Zoysia japonica v. Meyer were sprayed with three biostimulators (ROOTs, Fe ROOTs, and PGR IV) at 60 gpa at 30 psi. ROOTs and FeROOTs were applied at 1 and 2 gallons product per acre and PGR IV was applied at .5 ounces at 1 ounce per 1000 square foot. PGR IV Treatments were only made during the months of August and September. Cynodon dactylon X transvaalensis v. Tifway rooting in spring was significantly increased with applications of ROOTs at 1 gallon per acre. All other ROOTs and FeROOTs applications did not stimulate significant root growth. Eremochloa ophiuroides v. common was generally not responsive to Biostimulator application regardless of levels or timing. Eremochloa ophiuroides v. common did not exhibit a color change with the FeROOTs application. Zoysia japonica v. Meyer rooting was also generally non-responsive to biostimulants giving no significant root lift value differences. All ROOTs and FeROOTs applications stimulated root growth, but the differences were not significant from the control. The sod squares were irrigated as needed to prevent desiccation during the first week after transplanting, and received no supplemental irrigation water after seven days. The frames of sod were lifted with a hand-held push/pull gauge scale attached to the metal frame approximately 3 weeks after transplanting. (I. Monthly biostimulator applications study) This seems to support the observation made in previous studies that the most beneficial times to apply biostimulators to warm-season turfgrasses might be when root growth is being initiated in the spring or is slowing in the fall. Four tables included with root lift dates of each grass and the root lift values by date and biostimulator brand and rate. (II. Bermudagrass rooting in the shade) Bermudagrass sod squares were removed from the field 1 week after treatments of July 11, August 16, and September 16 and placed on root frames in a densely shaded area (approximately 50% full sunlight). ROOTs at 1 or 2 gallons pre acre had statistically higher root lift values than the control. FeROOTs also had larger values, but the data was not significantly different from the control. However, no consistency in response to biostimulator applications was indicated for the Sept. 16 and Oct. 16 root lift dates. No significant differences were indicated for ROOTs, FeROOTs, or PGR IV treatments at either date. (III. Bermudagrass squares treated with biostimulator after sod harvest) Harvested Cynodon dactylon v. Tifway squares were treated with ROOTs, FeROOTs, and PGR IV at levels of 2 GPA product, 2 GPA product, and 0.5 oz. Per 1000 ft2, respectively. Treatment date was August 23, 1990. The root lift methodology was used to determine data. Some extra sod strops remaining from a separate sod harvest study were used to evaluate bermudagrass rooting response if the biostimulators were applied after sod cut. The PGR IV treatment at 0.5 oz. resulted in a highly significant response in root lift values as compared to the control or the ROOTs or FeROOTs treatments. Both ROOTs and FeROOTs root lift values were similar to the check root lift values. (IV. Greenhouse studies with biostimulator applications to Bermudagrass) 4'' diameter Cynodon dactylon v. Tifway plugs were removed from test plots treated with the biostimulators ROOTs, FeROOTs, and PGR IV. Biostimulators were applied as described above. The plugs were placed in sand filled crops. Three different experiments were performed simultaneously. One set of the plugs was used simply for comparing any treatment response of biostimulator-treated bermudagrass plugs maintained under irrigated conditions in the greenhouse (irrigation supplied as an overhead mist 2 times daily for 15 minute). A second set of plugs were placed under shade cloth (50% sunlight reduction) under the mist system. The third set of plugs were placed on a plastic covered bench (no overhead mist irrigation) and received daily watering with a salt solution (1800 mg NaCl per liter). After approximately one month the roots were collected and oven-dried at 200°F for 24 hours and weighed. Harvest showed significant rooting response difference was indicated for ROOTs at 1 GPA. Root dry weights for these plugs were almost 4X greater than the control and other ROOTs and FeROOTs treatments. No differences in biostimulator in either "standard" or "salt" irrigation were observed. PGR IC at 0.5 oz per 1000 ft2 provided 3X increase in root mass as compared to the control. All other treatments except for ROOTs at 2 GPA were equal to or larger than the control. No differences in rooting for "standard" or "shade" conditions were indicated for any other biostimulator treatment, and in both cases root dry weights for the check were quite high.
See Also:Other items relating to: Biostimulants
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Goatley, M. Jr. 1991. Warm-season turfgrass rooting responses to biostimulators. Miss. State Turfgrass Field Day. p. 7-13.
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