INFLUENCE OF PHOSPHORUS AND NITROGEN ON ANNUAL BLUEGRASS ENCROACHMENT IN A CREEPING BENTGRASS PUTTING GREEN
Annual bluegrass (Poa annua L.) encroachment into newly established creeping bentgrass (Agrostis stolonifera L.) putting greens is a concern for golf course turfgrass managers attempting to maintain uniform and consistent putting surfaces.A 2-yr field study was conducted at the Joseph Valentine Turfgrass Research Center (University Park,PA USA) on a 2-yr-old sand-based ‘Penn A-4’ creeping bentgrass putting green to determine the influence of phosphorus (P) on changes in annual bluegrass cover and to identify soil and tissue P concentrations associated with limited annual bluegrass encroachment.Treatments were the factorial combination of four nitrogen (N) rates (195,293,391,and 488 kg N ha-1) and four P rates (0,43,86,and 129 kg P ha-1 yr-1).Treatments ≥ 43 kg P ha-1 yr-1 resulted in an increase in annual bluegrass cover compared to treatments with no P applied,but annual bluegrass cover was not affected as rates of P increased above 43 kg P ha-1 yr-1.Annual bluegrass cover in 0 kg P ha-1 yr-1 plots decreased by 2% over the 2-yr experiment; whereas,cover increased from ~3 to 7 % in plots receiving 43 to 129 kg P ha-1 yr-1.After 2-yr of treatments,soil Mehlich 3-P concentrations were positively correlated with changes in annual bluegrass cover; treatments producing concentrations >13 mg kg-1 had greater annual bluegrass cover than those measuring < 13 mg kg-1.Tissue P concentrations were significantly correlated with changes in annual bluegrass cover on all evaluation dates during this 2-yr study.Treatments producing tissue P concentrations ranging from 4.0 to 5.5 g P kg-1 had less annual bluegrass cover than treatments producing tissue concentrations > 5.5 g P kg-1.Nitrogen had no effect on annual bluegrass encroachment and no N-by-P treatment interaction occurred during the study.
annual bluegrass creeping bentgrass fertility nutrition
R. B. Raley P.J. Landschoot J.T. Brosnan
Agrium Advanced Technologies,Grantsville,MD 21536 USA Dept. ofPlant Science,Pennsylvania State University,University Park,PA 16802 USA Dept. of Plant Sciences,University of Tennessee,Knoxville,TN 37996 USA
国际会议
The 12th International Turfgrass Research Conference(第十二届国际草坪学术大会)
北京
英文
649-655
2013-07-14（万方平台首次上网日期，不代表论文的发表时间）