197,457 research outputs found
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Forced Transition of Tifway 419 using Select Cultural Management Practices
No full textA test was devised to investigate a forced spring transition from perennial ryegrass, back to Tifway (419) bermudagrass with scalping as the main treatment. Scalping of the turf was combined with various nitrogen and aerification treatments performed initially on May 22, 1997. Turfgrass aeration, either with or without extra nitrogen applications, when combined with an initial scalping operation, did not enhance bermudagrass transition by twenty-eight days after treatment (DAT), at the end of June 1997. Turfgrass color, quality and density were adversely affected from initial aerification treatments, especially when combined with initial scalping, The turf recovered best from multiple applications of nitrogen (applied at scalping and again at 7DAT). Turfgrass density (visual estimates) showed that in conjunction with scalping, two applications of nitrogen, totaling 1.5 lbs./month, without aerification, provided a dense turf at 16DAT, which was second only to the untreated control plot. At 27 DAT, scalping + N + N + aerification treated plots had the highest estimate of visual density, eventually showing a benefit from aerification. Scalped and aerified turf alone (no nitrogen) had unacceptable turf density at 16DAT and 27DAT. Generally, two 0.75 lb./N/m applications with aerification proved beneficial over the single application of nitrogen plus aerification, when both turfs were initially scalped. Although non-significant statistically, the additional treatment of nitrogen provided 10% more bermudagrass cover than the single application of nitrogen, for turfs both overseeded and scalped. Scalping alone, plus a single application of N, produced 33% less bermudagrass by June 30, then that of the untreated control
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Evaluation of Timing Applications of Ethephon and Trinexepac-Ethyl for Seed Head Suppression of Poa annua
No full textSeed head production from Poa annua is problematic on winter turfs, whether they are overseeded or not. Flowering culms are unsightly, prevent a uniform surface, and insure a continuous crop of seeds for the future. A field test was conducted to evaluate the effects of PROXY and a PROXY/PRIMO PGR tank mix for seed head control. Treatments were applied on three different dates in order to evaluate the degree of response of treatments and help define treatment window applications for future programs. PROXY when applied alone at 5 ounces/product/M produced a maximum of 60% seed head control at 26 days after a single application on February 15, and 83% seed head control at 27 days after a single application on March 1. A tank mix of PROXY/PRIMO (5.0/0.25 ounces/product/M) generally produced greater seed head control than PROXY alone. The tank mix produced seed head control effects quicker, greater, and longer than PROXY alone. Seed head suppression and percent seed head control was greatest when products were applied initially on either February 15 or March 1, 2001. PROXY/PRIMO produced the darkest color turf when applied on either February 15 or March 1. At least three tank mixes seem to be needed, applied monthly to suppress/control seed heads throughout the winter/spring season
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Use of Foramsulfuron (TADS) as a Transition Agent for Removing Perennial Ryegrass Overseed from Tifway 419 Bermudagrass
No full textTwo rates of Foramsulfuron (TADS) were applied at both low (0.50 lbs/M) and high (1.0 lbs/M) rates of water soluble nitrogen in May 2003 to enhance the transition from ryegrass to bermudagrass. Overall, the 0.2-ounce product/M rate of TADS herbicide, regardless of applied -N- rate produced excellent turfgrass color, density and overall turf quality. The same 0.2-ounce rate produced a good spring transition. Overall, the 0.4-ounce rate of TADS produced slightly more bermuda than the 0.2-ounce rate at the "end" of the transition (June 6). The higher fertility rates yielded better quality, color and turf density during transition then the low -N- rate when TADS was applied at the 0.4-ounce/product/M rate. Note that Tifway bermudagrass has in general, a more decumbent growing bermuda than common bermudagrass, which is less competitive during spring transition than Tifway 419. In summary, all rates of TADS enhanced spring transition. When the high rate of TADS is used on Tifway 419 (0.4 ounce/product/M), then better turf performance was achieved with the higher -N- rate applied in early May
Velký Vřešťov - ohrazení 1 - Bílý Kopec
No full textStav: 3Označení: 1255 (DB ohrazení)Popis: Poloha Bílý kopec. Ostrožna nad částí obce Malý Vřešťov, obklopená údolím říčky Trotiny. Hradiště vymezeno příkopem a valem vysokým až 2,5 m
Líšina - ohrazení 1 - Líšinský kopec
No full textStav: 3Označení: 830 (DB ohrazení)Popis: Poloha Líšinský kopec (394,4 m n. m.). Výběřek návrší nad údolím říčky Merklínky. Po obvodu náhorní plošiny identifikovatelné zbytky opevnění, převážně v podobě terénní hrany. Areál nedatován, v malé sondě zjištěna kulturní vrstva s atypickými zlomky pravěké keramiky.Poznámka: Vymezení PIAN je orientační
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Use of Foramsufulron (TADS) as a Transition Agent to Remove Poa Trivialis from an Overseeded Tifgreen Bermudagrass Putting Green
No full textFive sulfonylurea urea herbicides and one PGR were applied to a Tifgreen bermudagrass putting green to determine their response as spring applied transition aids to enhance the removal of Poa trivialis ovrseed. All sufonyl urea herbicide caused marginal to extreme injury to Poa trivialis by 9 DAT, which lasted at least a minimum of 3 weeks. Manor caused the least amount of injury and discoloration, but had little effect in promoting the transition back to bermudagrass. Tranxit caused extreme plot injury (leaf bronzing), but forced transition. The injury resulted in unacceptable quality. Embark PGR enhanced transition at 9 DAT only, with acceptable quality. After a second application of Emark, quality was reduced to sub-marginal levels, which was caused by straw colored leaf sheaths. TADS increased Bermuda transition at 9 DAT, but not at 23 DAT, regardless of the addition of fungicides, or not. The addition of fungicides to TADS in general did not affect color, quality or turf transition, with the exception on Jens 7 (38 DAT) when the lower rate (0.10 ounce/p/M) with fungicide had excellent quality (6.8) due to readily observed visual density (7.5). Trifloxysulfuron caused increased transition at 9 DAT only, and developed moderate turf injury, as well as poor turf color at 9 and 23 DAT. All entries produce turfs with good color, quality and density by 31 July. After a standard aerification and topdressing, and fertilization with 1.5 lbs of additional -N- / M. No treatments produced enhanced transition without marginal to unacceptable turf performance. TADS at 0.10 ounce/p/M were safer to the turf than was the 0.20 ounce/p/M rate of TADS
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Application of Proxy PGR for Poa Seed Head Suppression, 2000
No full textProxy (ethephon) was applied to 100% pure stands of Poa annua as either a single or repeat application 24 days apart at both a five and ten-ounce product rate per 1000 square feet. Percent plot seed heads were decreased significantly on three of five evaluation dates before either the loss of treatment effect and/or environmental conditions triggered profuse flowering (by 20 April, 2000). The five-ounce rate produced moderate seed head suppression at 16 and 25 days after the first treatments by which afterwards, control was minimal. By April, the five-ounce repeat applications were no better in suppression of seed heads than either of the single applications, regardless of application timing (March 3 or 29). The ten-ounce rates generally produced 40% - 80% greater seed heads suppression than the five-ounce rate treatments. Maximum seed head control was achieved by the repeat applications (March 3 and 29) of the ten-ounce rate, which consistently produced between 8% and 19%, seed head cover up until the first ten days of April 2000. Proxy, when applied at the five-ounce/M rate had the greatest effect in seed head suppression early in the test (10 March). Perhaps earlier season applications at the five-ounce rate may be necessary to manifest greater suppression initially, and perhaps in a cumulative fashion for season long control
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Response of Tall Fescue to R.P.-EXP31130A and R.P.-EXP31598A
No full textEXP31130A and EXP31598A were applied as repeat applications on June 5 and July 23, 1997 to tall fescue turf maintained at 3.0 inches. Application rates were 0.18 and 0.36 lbs. AI/A (31130A) and 7.0 and 14.0 fl. oz/prod/A (31598A). Each treatment was applied with and without Sequestrene 338 iron chelate, at the rate of 0.1 oz/m ². Untreated and iron-only controls were included in the test. Neither herbicide compound (either with of without iron) caused discoloration, leaf tip burn, sheath necrosis, or blotchy colored turf at the rates and timing applications performed here for low maintenance tall fescue under desert summer conditions. EXP31598A herbicide, when applied without iron to tall fescue turf, exhibited acceptable levels of turfgrass color at all times when applied at the 7 ounce/prod./acre rate. EXP31598A herbicide, when applied without iron to tall fescue turf, exhibited a lighter, but acceptable color turf, when applied at the 14 ounce/prod./acre rate. When iron was added, the 14 ounce/prod./acre rate of EXP31598A produced in general, a slightly darker turf than the same compound at the 7.0 ounce/prod./acre rate. Improved turf color resulted from the addition of iron at 0.1 ounce/m ² for tall fescue treated with EXP31130A. This occurred more so for turf treated at the low rate (0.18 lb. AI/A) than for turf treated at the high rate (0.36 lb. AI/A). The addition of iron to EXP31130A did not increase overall quality at either application rate of the herbicide. When iron was added (0.1 ounce/m ²), turfgrass quality was improved for EXP31598A, especially at the high application rate of 14 ounce/prod./acre
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Evaluation of Timing Applications of Ethephon and Trinexepac-Ethyl for Seed Head Suppression of Poa annua
No full textSeed head production from Poa annua is problematic on winter turfs, whether they are overseeded or not. Flowering culms are unsightly, prevent a uniform surface, and insure a continuous crop of seeds for the future. A field test was conducted to evaluate the effects of PROXY and a PROXY/PRIMO PGR tank mix for seed head control. Treatments were applied on three different dates in order to evaluate the degree of response of treatments and help define treatment window applications for future programs. PROXY when applied alone at 5 ounces/product/M produced a maximum of 60% seed head control at 26 days after a single application on February 15, and 83% seed head control at 27 days after a single application on March 1. A tank mix of PROXY/PRIMO (5.0/0.25 ounces/product/M) generally produced greater seed head control than PROXY alone. The tank mix produced seed head control effects quicker, greater, and longer than PROXY alone. Seed head suppression and percent seed head control was greatest when products were applied initially on either February 15 or March 1, 2001. PROXY/PRIMO produced the darkest color turf when applied on either February 15 or March 1. At least three tank mixes seem to be needed, applied monthly to suppress/control seed heads throughout the winter/spring season
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AEF 130360 Overseeding Safety
No full textSeveral items need consideration when products are evaluated for use as transition agents. These are (1) efficacy of ryegrass removal [rate of ryegrass decline and appearance of turf during transition], (2) tolerance and performance of incoming bermudagrass and (3) application safety for next season’s repeat overseed operations. This test was designed to evaluate application safety for the next overseeding which occurs in the early fall. Therefore, AEF was applied in the summer to bermudagrass turf prior to overseed operations. Most responses of the perennial ryegrass (overseed) turf to previous treatments of AEF 130360 occurred immediately after overseeding, from mid-October to early November. AEF 130360 applied 2 weeks before overseeding caused a significant decrease in seedling vigor, percent plot ryegrass cover, and percent bermudagrass plot straw present. Both AEF treatments applied closest to overseeding (2 weeks prior) had the least amount of initial ryegrass, the greatest amount of green bermudagrass, and later in the season, the most amount of straw (dormant) bermudagrass. Differences in turfgrass quality were not significant due to treatments at any time throughout the test, and most treatments ranked higher than the control in overall quality. Under the conditions of this test, application of AEF 130360 at either 0.64 or 1.28 ounces/product/M made one month before actual oversseding did not cause detrimental effects to ryegrass emergence, ryegrass cover, turfgrass color or overall quality
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