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  • Author or Editor: Nick E. Christians x
  • Journal of the American Society for Horticultural Science x
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Abstract

A turfgrass blend of ‘Parade’, ‘Adelphi’, ‘Glade’, and ‘Rugby’ Kentucky bluegrasses (Poa pratensis L.) was treated with N-[2,4-dimethyl-5-[[(trifluromethyl) sulfonyl] phenyl] acetamide (mefluidide) at 0.28 and 0.56 kg ha−1; (2-chloroethyl) phosphonic acid (ethephon) at 2.24, 4.48, and 6.72 kg ha−1; 5-(4-chlorophenyl)-3,4,5,9,10-pentaaza-tetracyclo [5,4,1,02,6,08,11]dodeca-3,9-diene (BAS 106 00 W) at 1.68, 3.36, and 5.04 kg ha−1, and α-(1-methylethyl)-α-[4-(trifluromethoxy) phenyl]-5-pyrimidinemethanol (EL-500) at 0.84, 1.21, and 1.40 kg ha−1 in field and greenhouse studies. Each of the materials investigated was effective in retarding Kentucky bluegrass growth in field studies. However, effects on growth inhibition and turfgrass quality varied between years. Ethephon was the only material not effective in reducing clipping yield in the greenhouse, whereas none of the growth retardants inhibited root organic matter production or rhizome weight in the greenhouse study.

Open Access

Abstract

‘Baron’ Kentucky bluegrass (Poa pratensis L.), ‘Kentucky 31’ tall fescue (Festuca arundinacea Schreb.), and ‘Reliant’ hard fescue (Festuca ovina var. duriuscula L. Koch.) were treated with N-[2,4-dimethyl-5-[[(trifluromethyl) sulfonyl] amino] phenyl] acetamide (Mefluidide) at 0.28 and 0.56 kg/ha, (2-chIoroethyI) phosphonic acid (ethephon) at 2.24, 4.48; and 6.72 kg/ha; and 5-(4-chIorophenyl)-3,4,5,9,10-pentaaza-tetracyclo [5,4,1,02’6, 08,11] dodeca-3,9-diene (BAS 106 00 W) at 1.68, 3.36, and 5.04 kg/ha. Similar responses to all rates of mefluidide and BAS 106 00 W, and to the 2.24 kg/ha rate of ethephon were observed for Kentucky bluegrass and hard fescue. Tall fescue shoot growth was reduced by mefluidide and the BAS 106 00 W, but to a lesser extent than the other 2 species, and was not affected by ethephon. Ethephon elongated internodes and shortened leaf blades of Kentucky bluegrass. Ethephon at 2.24 kg/ha reduced Kentucky bluegrass clipping weight and increased root organic matter production without reducing quality.

Open Access

Abstract

Concentrated solutions of Fluf, Fluf-Plus, Tuf, Fan NPK, Formolene, Maxigro-Plus, urea, and Folian were applied at 12.2, 24.4, and 48.8 kg N/ha with a gravity-fed, spinning disk, liquid applicator to a blend of Kentucky bluegrasses (Poa pratensis L. ‘Adelphi’, ‘Aquila’, ‘Glade’, and ‘Parade’) at times when environmental conditions were conducive to foliar burn. The methylene ureas, including Fluf, Fluf-Plus, and Tuf caused minimal burn at all rates of N. Formolene could be safely applied at 12.2 and 24.4 kg N/ha, and remained marginally acceptable at 48.8 kg N/ha. Fan NPK, urea, and Folian caused unacceptable levels of fertilizer burn at rates greater than 24.4 kg N/ha.

Open Access