Postprint version. Published in Journal of Turfgrass Management, Volume 3, Issue 2, January 1, 1999, pages 21-29.
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A greenhouse study was conducted in a hydroponic system to determine the nitrogen (N) utilization efficiency (NUE) of 14 creeping bentgrass cultivars. There were significant differences among cultivars in plant tissue dry weight, tissue N content, root absorption efficiency (RAE), and NUE. Considering all plant tissue (whole plant), 'Penncross' accumulated the highest N accompanied with the highest whole plant dry weight (WPDW), while 'Allure' accumulated the lowest total Nand WPDW than all the other cultivars. The proportion of WPDW and total N partitioned to shoots was higher than partitioned to roots in each cultivar. On a whole plant basis, 'Regent' had the highest NUE while 'Allure' had the lowest NUE. N absorption efficiency values were comparatively higher in 'Allure' than any of the other cultivars, while 'Forbes' had the lowest RAE. The RAE value of the cultivars was not a response to the NUE indicating that differences in RAE was not a critical factor involved in genotypic differences in NUE. Differences in NUE among most cultivars were correlated to plant dry weight in a second experiment. Solution systems have the potential for an effective means of screening the NUE of creeping bentgrass cultivars.
Agronomy and Crop Sciences