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Growth and nitrogen uptake of CO 2 ‐enriched rice under field conditions
Author(s) -
Kim H. Y.,
Lieffering M.,
Miura S.,
Kobayashi K.,
Okada M.
Publication year - 2001
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1046/j.1469-8137.2001.00111.x
Subject(s) - panicle , dry matter , oryza sativa , nitrogen , yield (engineering) , agronomy , grain yield , crop , growing season , chemistry , maturity (psychological) , biology , materials science , biochemistry , psychology , developmental psychology , organic chemistry , metallurgy , gene
Summary• The effects of elevated CO 2 are reported here on the uptake of nitrogen (N) and its relationships with growth and grain yield in rice ( Oryza sativa ).• Using free‐air CO 2 enrichment (FACE), rice crops were grown at ambient or elevated (c. 300 µmol mol −1 above ambient) CO 2 and supplied with low, medium or high levels of N.• For the medium and high N treatments, FACE increased N uptake at panicle initiation but not at maturity. For total dry matter, as well as spikelet number and grain yield, positive interactions between CO 2 and N uptake were observed. Furthermore, spikelet number was closely associated with N uptake at panicle initiation.• These results indicate that, to maximize rice grain yield under elevated CO 2 , it is important to supply sufficient N over the whole season, in order to maintain the enhancement in dry matter production. In addition, N availability must be coordinated with the developmental stage of the crop, specifically to ensure that sufficient N is available at panicle initiation in order to maximize spikelet number and grain yield.