Journal
EUPHYTICA
Volume 198, Issue 1, Pages 137-151Publisher
SPRINGER
DOI: 10.1007/s10681-014-1101-9
Keywords
Nitrogen use efficiency (NUE); Oryza sativa L.; Oryza glaberrima Steud.; Physiological NUE (pNUE); Absorption NUE (aNUE); Agronomical NUE (agNUE)
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Funding
- CUD (Commission universitaire pour le Developpement) scholarship program in Belgium
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Nitrogen use efficiency (NUE) in cultivated rice has become of utmost importance due to ecological and economical consequences of nitrogen (N) losses. However, detailed information on the components of NUE-physiological, absorption and agronomical NUEs-is lacking. The present study aimed to determine the components of NUE for three cultivars of Asian and African rices [IR64 (Oryza sativa indica), Azucena (O. sativa japonica) and TOG7105 (O. glaberrima)] exposed to a wide range of N supply, from excess to deficiency-from 4x to 1/8x of the standard Yoshida solution (1x). Increasing the N supply to 2x or 4x did not induce much change for most parameters, including tissue N concentrations and pNUE. However, aNUE and agNUE decreased gradually as the N supply increased from 1/2x to 4x. In contrast, lowering the N supply, particularly to 1/4x or 1/8x, induced a significant decrease in most measured parameters, except NUEs. The pNUE increased gradually when lowering the N supply from 1x to 1/8x, while aNUE and agNUE were maximal at 1/2 and/or 1/4x according to the cultivar. In contrast, the F-v/F-m and PSII values remained unchanged. Differences between cultivars were low. However, the O. glaberrima cultivar showed a significantly lower aNUE and agNUE than both O. sativa cultivars under low N supply (1/4 and 1/8x). These results demonstrate that all NUE components were sharply and differentially affected by low N supply, while the PSII remained unaffected. These results are important for determining the cultivar and N supply with the best balance between intensive and sustainable rice cultivation.
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