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Correlation and regression approaches to modeling rainfall-crop yield relationships in a tropical environment

Indian Agricultural Research Journals

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Title Correlation and regression approaches to modeling rainfall-crop yield relationships in a tropical environment
 
Creator BELLO, N J
 
Subject correlation, regression, modeling rainfall-crop yield
 
Description Simple correlation and multiple regression of total rainfall and actual water availability on maize yield for 3 different phenological stages of maize (Zea mays L.) during 1970-98 growing seasons were done. Both rainfall and actual wateravailability were each significantly correlated with yield, but rainfall at every stage showed a comparatively lowercoefficient of determination of yield than actual water availability, However, the simple correlation model appeared to overestimate the contribution due to rainfall, consequently the sum of the contribution due to both rainfall and actualwater availability (values ranging from 124-173% during the 3 phenological stages) looked unrealistic. However themultiple regression model produced a more realistic result. It showed that the combination of rainfall and actual wateravailability during each phenological stage accounted for less than 100% variation in yield and this implies that some othervariables other than rainfall and A W A might also be important in explaining the variability in yield. Generally the need to be cautious in using rainfall data for yield prediction has been stressed while the advantage of a carefully selected relevant independent agroclimatological indices and adoption of holistic rather than parametric approach to modeling climate-crop yield has been highlighted.
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2013-04-02
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/28700
 
Source The Indian Journal of Agricultural Sciences; Vol 70, No 11 (2000)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/28700/12985
 
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