Drought stress characterization of post-rainy season (rabi) sorghum in India

Kholova, Jana, McLean, Greg, Vadez, Vincent, Craufurd, Peter and Hammer, Graeme L. (2013) Drought stress characterization of post-rainy season (rabi) sorghum in India. Field Crops Research, 141 38-46. doi:10.1016/j.fcr.2012.10.020


Author Kholova, Jana
McLean, Greg
Vadez, Vincent
Craufurd, Peter
Hammer, Graeme L.
Title Drought stress characterization of post-rainy season (rabi) sorghum in India
Journal name Field Crops Research   Check publisher's open access policy
ISSN 0378-4290
1872-6852
Publication date 2013-02
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.fcr.2012.10.020
Volume 141
Start page 38
End page 46
Total pages 9
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2014
Language eng
Abstract During the post-rainy (rabi) season in India around 3 million tonnes of sorghum grain is produced from 5.7 million ha of cropping. This underpins the livelihood of about 5 million households. Severe drought is common as the crop grown in these areas relies largely on soil moisture stored during the preceding rainy season. Improvement of rabi sorghum cultivars through breeding has been slow but could be accelerated if drought scenarios in the production regions were better understood. The sorghum crop model within the APSIM (Agricultural Production Systems sIMulator) platform was used to simulate crop growth and yield and the pattern of crop water status through each season using available historical weather data. The current model reproduced credibly the observed yield variation across the production region (R2=0.73). The simulated trajectories of drought stress through each crop season were clustered into five different drought stress patterns. A majority of trajectories indicated terminal drought (43%) with various timings of onset during the crop cycle. The most severe droughts (25% of seasons) were when stress began before flowering and resulted in failure of grain production in most cases, although biomass production was not affected so severely. The frequencies of drought stress types were analyzed for selected locations throughout the rabi tract and showed different zones had different predominating stress patterns. This knowledge can help better focus the search for adaptive traits and management practices to specific stress situations and thus accelerate improvement of rabi sorghum via targeted specific adaptation. The case study presented here is applicable to other sorghum growing environments.
Keyword Sorghum
Drought stress characterization
Modelling
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2014 Collection
 
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