Nitrate/ammonium ratios affect ryegrass growth and nitrogen accumulation in a hydroponic system

Ryegrass has increasingly been used in constructed wetlands for treatment of eutrophic wastewater. To properly match plant species with the characteristics of wastewater being treated, it is important to know the performance of plant species under different nitrate/ammonium (NO3-/NH4+) ratios. We in...

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Bibliographic Details
Published in:Journal of plant nutrition 2011-01, Vol.34 (1-4), p.206-216
Main Authors: Cao, Haiqin, Ge, Ying, Liu, Dong, Cao, Qianjin, Chang, Scott X, Chang, Jie, Song, Xiulin, Lin, Xue
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
biomass production
constructed wetlands
dry matter production
Economic plant physiology
Flowers & plants
Fundamental and applied biological sciences. Psychology
Grasses
hydroponics
Lolium perenne
Metabolism
Metabolism. Physicochemical requirements
N concentration
nitrates
nitrogen
Nutrition. Photosynthesis. Respiration. Metabolism
Plant physiology and development
root growth
root shoot ratio
shoots
Soils
wastewater
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Summary:Ryegrass has increasingly been used in constructed wetlands for treatment of eutrophic wastewater. To properly match plant species with the characteristics of wastewater being treated, it is important to know the performance of plant species under different nitrate/ammonium (NO3-/NH4+) ratios. We investigated ryegrass (Lolium perenne L.) dry matter (DM) production and N accumulation under five NO3-/NH4+ ratios (100/0, 75/25, 50/50, 25/75, 0/100) in a hydroponic system. The results showed that ryegrass total DM, shoot DM, root DM and nitrogen (N) accumulation were greater under NO3-/NH4+ ratios of 50/50 and 75/25 than under other NO3-/NH4+ ratios, indicating that ryegrass can be best used in constructed wetlands for treating wastewater with such NO3-/NH4+ ratios to achieve high biomass production and efficient removal of N. On the other hand, for treating wastewater with either NO3- or NH4+ dominate the inorganic N, other plant species that are more adapted to such conditions should be explored.
ISSN:0190-4167
1532-4087
DOI:10.1080/01904167.2011.533322