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Zhaolong Wang, Jixiong Sun, Ji Li, and Yanhua Zhu

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Edward J. Nangle, David S. Gardner, James D. Metzger, John R. Street, and T. Karl Danneberger

Gardner and Wherley (2005) . Three varieties of turfgrass were used: sheep’s fescue ( Festuca ovina L.), tall fescue [ Schedenorus phoenix (Scop.) Holub], and rough bluegrass ( Poa trivalis L.). Applications of TE reduced clipping yields in all

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Yang Gao and Deying Li

initiated on 20 Mar. 2011. After the 8-week fertilization period, a 4-week no-fertilization period was introduced to evaluate the fertility levels remaining in the root zones based on clipping yield change and visual quality. After the evaluation, watering

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Nicholas Menchyk, Douglas G. Bielenberg, Samuel Martin, Clint Waltz, Hong Luo, Frank Bethea Jr., and Haibo Liu

clipping yields and higher levels of nonstructural carbohydrates leading to a potential increase in shade tolerance in ‘Diamond’ zoysiagrass ( Qian and Engelke, 1999 ). Atkinson et al. (2012) demonstrated that ‘Diamond’ can be maintained with 0.013 kg a

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Christian M. Baldwin, Haibo Liu, Lambert B. McCarty, Hong Luo, and Joe E. Toler

.) control, respectively. The bentgrass green did not receive additional topdressing except one after each of the three core aerifications annually. Data collection. Data collected included microenvironment conditions, visual TQ, clipping yield, chlorophyll

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Christian M. Baldwin, Haibo Liu, Lambert B. McCarty, Hong Luo, Joe Toler, and Steven H. Long

#9840; Taylor), visual turfgrass quality (TQ), clipping yield, chlorophyll concentration, root total nonstructural carbohydrates (TNC), soil bulk density, and water infiltration rates. Canopy and soil (7.6 cm depth) temperatures were recorded after each

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Jinghua Fan, George Hochmuth, Jason Kruse, and Jerry Sartain

involving RW. Fig. 1. Changes in concentrations of nitrogen (N) species in reclaimed water at the Envirotron greenhouse (Gainesville, FL) during 1 year [started from 18 July 2011 (week 0)]; 1 mg·L −1 = 1 ppm. Response of turf quality and clippings yields

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Daniel Hargey, Benjamin Wherley, Andrew Malis, James Thomas, and Ambika Chandra

differences due to TE were observed in study 2, there were again decreased clipping yields observed with the use of TE in both cultivars. Fig. 2. Effect of plant growth regulator (PGR) and trinexapac-ethyl on mean weekly clipping dry weights of ‘Floratam’ and

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Young K. Joo, Nick E. Christians, and John M. Bremner

We evaluated the response of Kentucky bluegrass (Pea pratensis L.) turf to urea amended with the urease inhibitors PPD, NBPT, and ATS and with the cations K+ (KCl) and Mg+2 (MgCl2). Treatments for the 2-year field experiment included liquid urea applied monthly in June to Sept. 1985 and 1986 at 49 kg N/ha with PPD (1%, 2%, 3% by weight of applied N), NBPT (0.5%, 1%, 2%), ATS (5%, 15%, 25%), K+ (5%, 15%, 25%), and Mg+2 (5%, 15%, 25%). The NBPT was included only in the 1986 field study. The Mg+2 and K+ reduced foliar burn and increased turf quality during mid- and late Summer 1985 at the 5% rate, but clipping yield was not affected by any treatment. In 1986, under milder climatic conditions, PPD and NBPT increased clipping yield by 13.2% and 15.2%, respectively. At the 15% rate, ATS increased clipping yield by 15.1%, but, on average, PPD and NBPT were much more effective. Chemical names used: phenylphosphorodiamidate (PPD), N-(n -butyl) thiophosphoric triamide (NBPT), and ammonium thiosulfate (ATS).

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J.M. Fu, A.J. Koski, and Y.L. Qian

Salt problems in turfgrass sites are becoming more common. The effects of mowing management on salinity tolerance are not well understood. The objective of this study was to examine the effects of three mowing regimes on turf quality and growth responses of `L-93' creeping bentgrass (Agrostis palustris L.) to salinity stress. Sods of `L-93' creeping bentgrass were grown in containers (45 cm long and 10 cm in diameter) in a greenhouse. Treatments included three mowing regimes (clipping three times weekly at 25.4 mm, four times at 12.7 mm, and daily at 6.4 mm) and four levels of irrigation water salinity (control, 5, 10, and 15 dS·m-1). The relationship of increasing soil salinity with increasing irrigation water salinity was linear in each soil layer. Increasing salinity reduced turf quality and clipping yield more severely and rapidly when mowed at 6.4 mm than at 12.7 or 25.4 mm. Regression analysis of soil salinity and turf quality suggested that turf quality of creeping bentgrass mowed to 6.4, 12.7, and 25.4 mm fell to an unacceptable level when soil salinity reached 4.1, 12.5, and 13.9 dS·m-1, respectively. Data on turf quality, clipping yield, and verdure indicated that salinity damage becomes more severe under close mowing conditions and that a moderate increase in mowing height could improve salinity tolerance of creeping bentgrass.