Influence of elevated C02 and phosphorus nutrition on the growth and yield of a short-duration rice (Oryza sativa L. cv. Jarrah)

Seneweera, Saman and Milham, Paul and Conroy, Jann (1994) Influence of elevated C02 and phosphorus nutrition on the growth and yield of a short-duration rice (Oryza sativa L. cv. Jarrah). Australian Journal of Plant Physiology, 21 (3). pp. 281-292. ISSN 1445-4408


The growth and development of a short-duration rice cultivar (Oryza sativa L. cv. Jarrah), grown in flooded soil with a range of phosphorus (P) levels and exposed to atmospheric C02 concentrations of either 350 or 700 pL L-1 was followed for 146 days after planting (DAP). Development (estimated by rate of tiller production and time to flowering) was faster with higher soil P levels and C02 enrichment, the effect being more pronounced with C02 enrichment. During the early vegetative phase (up to 35 DAP), when rates of tiller production were low, shoot growth and rates of leaf expansion were faster at elevated C02 concentrations and high soil P levels. Rates of tiller production were greater with these treatments during the 35-56 DAP period, when tillering was at a maximum. Shoot elongation was reduced at elevated C02 levels and at high soil P levels during this period. By 146 DAP leaf weight was greater at high P levels, but C02 enrichment accelerated tiller production to such an extent that final leaf weight was lower at high C02, probably because there were fewer, and smaller, leaves on each tiller. Despite this, grain yield was increased by up to 58% by C02 enrichment, with increases occurring even at low soil P levels. This was due mainly to an increase in grain number per panicle, although panicle number also increased. Higher soil P levels also increased grain number and yield. The P concentration in the foliage was unaffected by the C02 treatments and the concentration required to produce maximum yield was 0.18% (dry wt basis) at both C02 levels. Greater starch accumulation in the stems of high-C02-grown plants may have accounted for the higher number of grains in each panicle.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 28 Feb 2018 04:24
Last Modified: 28 Feb 2018 04:24
Uncontrolled Keywords: Elevated CO2, rice, growth, grain yield
Fields of Research : 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070301 Agro-ecosystem Functionand Prediction
Socio-Economic Objective: D Environment > 96 Environment > 9605 Ecosystem Assessment and Management > 960501 Ecosystem Assessment and Management at Regional or Larger Scales
Funding Details:
Identification Number or DOI: 10.1071/PP9940281

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