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

Boonjung H. and Fukai S. (1996) Effects of soil water deficit at different growth stages on rice growth and yield under upland conditions. 2. Phenology, biomass production and yield. Field Crops Research, 48 1: 47-55. doi:10.1016/0378-4290(96)00039-1


Author Boonjung H.
Fukai S.
Title Effects of soil water deficit at different growth stages on rice growth and yield under upland conditions. 2. Phenology, biomass production and yield
Journal name Field Crops Research   Check publisher's open access policy
ISSN 0378-4290
Publication date 1996-01-01
Sub-type Article (original research)
DOI 10.1016/0378-4290(96)00039-1
Volume 48
Issue 1
Start page 47
End page 55
Total pages 9
Publisher Elsevier B.V.
Language eng
Subject 1102 Cardiovascular Medicine and Haematology
1110 Nursing
Abstract Phenological development, shoot dry matter production, grain yield and yield components of rice were examined in relation to drought occurring at various singes 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 true 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.
Keyword Growth stage
Oryza
Phenology
Rice
Water stress
Yield components
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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