Journal
AGRICULTURAL WATER MANAGEMENT
Volume 202, Issue -, Pages 174-182Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.agwat.2018.02.027
Keywords
CO2 concentration; Nitrogen; Reduced irrigation; Water use efficiency; Nitrogen use efficiency
Categories
Funding
- National Natural Science Foundation of China [51725904, 51439006, 51621061]
- National Key Research Program [2016YFC0400207]
- Chinese Scholarship Council (CSC)
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The interactive effects of CO2 concentration elevation, N fertilization, and reduced irrigation regimes on water and nitrogen use efficiency (WUE and NUE) of tomato (Solarium lycopersicum L.) plants at both leaf and whole plant scales were investigated in a split-root pot experiment. The plants were grown in two separate climate controlled greenhouse cells at atmospheric [CO2] of 400 (a[CO2]) and 800 (e[CO2]) ppm, respectively. In each cell, plants were fertilized at either 1.5 or 3 g N per pot. The leaf physiological parameters, C and N content in stem, leaf and fruit were determined, and both WUE and NUE were evaluated. Plants harvested from 3 g N per pot associated with e[CO2] environment possessed the greatest photosynthetic rate (P-n) and lowest stomatal conductance (g(s)) and transpiration rate (T-r), resulting in the highest WUE at stomatal and leaf levels. Especially alternate partial root-zone irrigation (PRI) strategy coupled with e[CO2] had the potential to synergistically reduce g(s), and T-r while sustain P-n and leaf water status, and further improve tomato leaf WUE. e[CO2] combined with sufficient N fertilization enhanced the biomass, C accumulation and N uptake of plants under reduced irrigation; yet the WUE and NUE at whole plant scale were affected solely by the N supply being greater in low N fertilizer. These findings provide useful knowledge on efficient irrigation and N management for adapting to the future water-limited and CO2-enriched environment.
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