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| Web URL(s): | https://a-c-s.confex.com/crops/2011am/webprogram/Paper65235.html
Last checked: 02/21/2017
Notes: Abstract only |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Zhang, Chenxi;
Bowman, Daniel;
Rufty, Thomas;
Miller, Grady |
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| Author Affiliation: | North Carolina State University, Raleigh, NC |
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| Title: | Nitrogen uptake kinetics of Kentucky bluegrass as a determinant of nitrogen use efficiency |
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| Section: | Turfgrass ecology and the environment
Other records with the "Turfgrass ecology and the environment" Section
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| Meeting Info.: | San Antonio, TX: October 16-19, 2011 |
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| Source: | 2011 International Annual Meetings: [Abstracts][ASA-CSSA-SSSA]. 2011, p. 65235. |
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| Publishing Information: | [Madison, WI]: American Society of Agronomy, Crop Science Society of America, Soil Science Society of America |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Cultivar evaluation; Kinetics; Lysimeters; Nitrate losses; Nitrogen deficiency; Nitrogen uptake; Nutrient solutions; Poa pratensis
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| Abstract/Contents: | "A nutrient solution screening procedure was used to identify Kentucky bluegrass (Poa pratensis L.) cultivars having high vs. low NO3-N uptake capacity. Subsequent column lysimeter studies were carried out to examine if advantageous nitrogen uptake ability would translate into increased competitiveness and reduced nitrate leaching. Tillers of 80 Kentucky bluegrass cultivars were rooted and transferred to a flow-through solution culture system. After establishment, plants were treated to develop N deficiency. 15N-labeled KNO3 was introduced at high (1 mM) and low (0.05 mM) concentrations to screen for differences in the kinetic uptake parameters Vmax and Km, respectively. After a brief uptake period, plants were harvested, dried, and analyzed for 15N content to determine N uptake rate. There were significant and substantial differences among the cultivars for uptake at both high and low N concentrations. Accordingly, 'Julia' and 'Midnight' were selected as representative cultivars exhibiting superior and inferior uptake ability, respectively. To examine the role of uptake capacity on competitiveness, the two cultivars were planted alternately in a grid pattern using column lysimeters filled with medium-coarse sand. After establishment, 15N-labeled potassium nitrate solution (1mM and 0.05mM) was applied to each column. After an uptake/flush period, individual plants of each cultivar were harvested and pooled for 15N analysis. Cultivar 'Julia' exhibited only slightly higher (6.6%, p = 0.067) nitrate uptake than Midnight at 1mM N, and no difference at 0.05mM N." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Zhang, C., D. Bowman, T. Rufty, and G. Miller. 2011. Nitrogen uptake kinetics of Kentucky bluegrass as a determinant of nitrogen use efficiency. Int. Ann. Meet. p. 65235. |
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| Web URL(s):
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Last checked: 02/21/2017
Notes: Abstract only |
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