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Environmental characterization and yield gap analysis to tackle genotype-by-environment-by-management interactions and map region-specific agronomic and breeding targets in groundnut

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Relation http://oar.icrisat.org/11881/
https://doi.org/10.1016/j.fcr.2021.108160
doi:10.1016/j.fcr.2021.108160
 
Title Environmental characterization and yield gap analysis to tackle genotype-by-environment-by-management interactions and map region-specific agronomic and breeding targets in groundnut
 
Creator Hajjarpoor, A
Kholová, J
Pasupuleti, J
Soltani, A
Burridge, J
Degala, S B
Gattu, S
Murali, T V
Garin, V
Radhakrishnan, T
Vadez, V
 
Subject Plant Breeding
Groundnut
 
Description The high degree of Genotype by Environment by Management (GxExM) interactions is a serious challenge for
production and crop improvement efforts. This challenge is especially true for a crop like groundnut that is often
grown as a rainfed crop in diverse environments and management, leading to considerable production fluctuations
among regions and seasons. Developing a means to characterize the drivers of variable yield and to
identify region specific breeding objectives were the main motivations for this research, using groundnut production
in India, as a case study for rainfed crops. Historically, five groundnut production areas have been
considered by Indian crop improvement programs. Our objectives were to assess the relevance of this zonation
system and possibly to re-define production areas with a higher degree of similarities into homogeneous production
units (HPUs). Towards this, we used yield gap analysis and the geo-biophysical characters of the production
region to understand and deal with GxExM interactions. Weather and soil data, crop parameters, and
management information data were collected and groundnut production was simulated at the district scale over
30 consecutive years. Consequently, the geographic distribution of the potential yields and the yield gaps were
first estimated to understand the main production limitations in a given region. Large and variable yield gaps
(with a mean of ~70 %) were observed and results revealed a readily exploitable production gap (~ 8 M tons),
which might be bridged by following recommended agronomic practices. Water deficit limited the yield potential
by an average of 40 %, although with large variability among districts. However, large and variable yield gaps
remained. To resolve the unexplained variation, principal component and cluster analysis of agronomic model
output together with geo-biophysical indicators for each district were carried out. This resulted in seven HPUs,
having well-defined production-limiting constraints. Grouping by HPU greatly reduced variance in actual and
simulated yields, as compared to grouping across all groundnut production zones in India. The HPU based
approach delimited precise geographic regions within which HPU-specific GxM products could be designed by
crop improvement programs to boost productivity.
 
Publisher Elsevier
 
Date 2021-04
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://oar.icrisat.org/11881/1/main.pdf
Hajjarpoor, A and Kholová, J and Pasupuleti, J and Soltani, A and Burridge, J and Degala, S B and Gattu, S and Murali, T V and Garin, V and Radhakrishnan, T and Vadez, V (2021) Environmental characterization and yield gap analysis to tackle genotype-by-environment-by-management interactions and map region-specific agronomic and breeding targets in groundnut. Field Crops Research (TSI), 267. pp. 1-15. ISSN 0378-4290