Abstract
Aims: Nitrogen (N) resorption from senescing leaves is essential to meet N demand for grain development in rice (Oryza sativa L.). We asked whether rice is capable of reducing N in their senesced leaf blade to lower concentration at elevated [CO2] more in low than in high N fertilization. Methods: The effects of elevated [CO2] and N fertilization on senesced leaf N concentration were examined for 3 years with the free-air CO2 enrichment (FACE) technology. Results: Elevated [CO2] decreased the senesced leaf N concentration but the change was generally small and did not hold over the growing seasons. Additionally, there was no evidence that the change was greater at low than at high N fertilization levels. Conclusions: The 3-year field measurements showed that elevated [CO2] did not change the senesced leaf N concentration consistently. The occasional decrease in senesced leaf N concentration was associated with a decrease in green leaf N concentration at elevated [CO2] but not with the proportion of leaf N resorbed during leaf senescence.
Original language | English |
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Pages (from-to) | 231-240 |
Number of pages | 10 |
Journal | Plant and Soil |
Volume | 418 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 2017 Sep 1 |
Keywords
- Atmospheric carbon dioxide concentration
- Global change
- Leaf senescence
- Litter production
- Litter quality
- Nitrogen retranslocation
ASJC Scopus subject areas
- Soil Science
- Plant Science