NITROGEN PARTITIONING COMPARISONS AMONG WARM-SEASON TURFGRASS SPECIES
A greenhouse study was conducted to evaluate the partitioning of nitrogen (N) in roots and shoots of four widely utilized warm season turfgrass species (‘Celebration’ bermudagrass,‘Argentine’ bahiagrass,‘Empire’ zoysiagrass and ‘Floratam’ St.Augustinegrass) grown in a greenhouse at Gainesville,Florida.Studies suggest that warm season grass species respond differently to applied N and that N partitioning varies among species.The objective of this research was to compare N partitioning of four turfgrass species for shoot growth,root growth,and root architectural parameters (root length,and diameter).Rooting parameters (root length and diameter) were analyzed using Win-Rhizo software (Regent Instrument Inc.,Canada) and root and shoot tissue was analyzed for total nitrogen content.Based on total root length,root shoot ratio (R/S) and N content in roots,Floratam St.Augustinegrass had greater N partitioning to roots than the other species with a total of ~108 kg N ha-1 in 2011 and ~94 kg N ha-1in 2012.In comparison to other species,Floratam St.Augustinegrass demonstrated potential for improved N retention in roots,thus Floratam St.Augustinegrass might be able to absorb more nutrients that could enhance its persistence in unfertile soils.Rooting characteristics and N partitioning mechanisms are important to avoid nutrient stress and selection for these characteristics may improve breeding efforts for more N efficient cultivars.
Rooting characteristics N retention Root shoot ratio
Bishow Poudel Diane Rowland John Erickson Bryan Unruh Kevin Kenworthy
Department of Agronomy,University of Florida,Gainesville,FL 32611 USA Department ofEnvironmental Horticulture,University of Florida,Gainesville,FL 32611 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
503-507
2013-07-14（万方平台首次上网日期，不代表论文的发表时间）