Effects of soil water deficit at different growth stages on rice growth and yield under upland conditions. 2. Phenology, biomass production and yield

H. Boonjung and S. Fukai

Department of Agriculture, The University of Queensland, Brisbane, Queensland 4072, AustraliaReceived 4 December 1995;

revised 19 March 1996;accepted 20 March 1996. ;

Available online 19 March 1999.

AbstractPhenological development, shoot dry matter production, grain yield and yield components of rice were examined in relation to drought occurring at

various stages of growth.Rice was sown three or four times at three-week intervals in the field in each of two years, and performance in

three stress trials was compared with that in corresponding irrigation trials, with the aim of quantifying the response of the crop to water stress of 23–34

days' duration developing at different growth stages. When drought occurred during vegetative stages, it had only a small effect on subsequent

development and grain yield. The reduction in yield of up to 30% was due to reduced panicle number per unit area in one trial, and reduced number of

spikelets per panicle in another. The effect of water stress on yield was most severe when drought occurred during panicle development. Anthesis was

delayed, the number of spikelets per panicle was reduced to 60% of the irrigated control and the percentage of filled grains decreased in one crop to

zero. This decrease in grain yield to less than 20% of the control was associated with low dry matter production during the drought period as well as

during the recovery period following the drought. When drought occurred during grain filling, the percentage of filled grains decreased to 40% and

individual grain mass decreased by 20%. The effect of stress was also related to its severity during grain filling. Stress at this stage hastened maturity.

The results suggest that variation in yield components due to water availability is related to the variation in dry matter production at particular growth

stages. Results of a supplementary shading experiment show that the relationship between spikelet number per panicle or single grain mass and crop

growth rate was the same, whether growth rate was varied by availability of soil water or solar radiation. Filled-grain percentage, however, was more

sensitive to drought stress than shading when comparison was made at a similar crop growth rate.

Author Keywords: Rice; Oryza; Water stress; Yield components; Growth stage; Phenology

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