Growth and nitrogen uptake of CO2-enriched rice under field conditions
Growth and nitrogen uptake of CO2-enriched rice under field conditions
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DOI：
10.1046/j.1469-8137.2001.00111.x
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发表时间：
2001-05-01
期刊：
影响因子：
9.4
通讯作者：
Okada, M
中科院分区：
文献类型：
--
作者：
Kim, HY;Lieffering, M;Okada, M
The effects of elevated CO2 are reported here on the uptake of nitrogen (N) and its relationships with growth and grain yield in rice (Oryza sativa).Using free-air CO2 enrichment (FACE), rice crops were grown at ambient or elevated (c. 300 mu mol mol(-1) above ambient) CO2 and supplied with tow, 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 CO2 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 CO2, 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 co-ordinated 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.
