Effects of CO2 enrichment at different stages of panicle development on yield components and yield of rice (Oryza sativa L.)

Yoshida, S.

Soil Science and Plant Nutrition 19(4): 311-316

1973


ISSN/ISBN: 0038-0768
DOI: 10.1080/00380768.1973.10432600
Accession: 000078033

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Abstract
In field experiments at Los Banos, plants of rice cv. IR8 were enclosed in mylar film and given CO2 enrichment treatments at 5 stages of panicle development and grain filling. Enrichment for 33 days before flowering increased grain yields by >30% over the controls by increasing grain number and weight. Enrichment for 9-10 days at rachis-branch differentiation or spikelet differentiation increased yields 10% by increasing grain number. A 2-week treatment from reduction division to flowering had no overall effect on yield. Enrichment for the 30 days after flowering increased yields 10% by increasing grain weight and filled-grain percentage. The results indicated that grain number/unit area limited grain yield more than grain filling.