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- Publisher
- Wiley
- Copyright
- Copyright © 2001 Wiley Subscription Services, Inc., A Wiley Company
- ISSN
- 0931-2250
- eISSN
- 1439-037X
- DOI
- 10.1046/j.1439-037x.2001.00471.x
- Publisher site
- See Article on Publisher Site
Abstract
The absorption and utilization of nitrogen (N) by plants are affected by salinity and the form of N in the root medium. A hydroponic study was conducted under controlled conditions to investigate growth and N uptake by barley (Hordeum vulgare L.) supplied with five different NH4+‐N/NO3−‐N ratios at electrical conductivity of 0 and 8 dS m−1. The five NH4+‐N/NO3‐N ratios were 0/100, 25/75, 50/50, 75/25 and 100/0, each giving a total N supply of 100 mg N l−1 in the root medium. A mixed N supply of NH4+ and NO3− resulted in greater accumulation of N in plants than either NO3− or NH4+ as the sole N source. Plants produced a significantly higher dry matter yield when grown with mixed N nutrition than with NH4+ or NO3− alone. Total dry matter production and root and shoot N contents decreased with increasing salinity in the root medium. The interaction between salinity and N nutrition was found to be significant for all the variables. A significant positive correlation (r=0.97) was found between nitrogen level in the plant shoot and its dry matter yield.
Journal
Journal of Agronomy and Crop Science – Wiley
Published: Jun 5, 2001