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Acta Agron Sin ›› 2013, Vol. 39 ›› Issue (03): 449-454.doi: 10.3724/SP.J.1006.2013.00449

• CROP GENETICS & BREEDING·GERMPLASM RESOURCES·MOLECULAR GENETICS • Previous Articles     Next Articles

Heterogeneity of Error Variance and Its Effect on the Variety Evaluation in Corn Regional Trials

WANG Chun-Ping1,*,HU Xi-Yuan 2,*,SHEN Kun-Lun2   

  1.  1 College of Agronomy, Henan University of Science and Technology, Luoyang 471003, China; 2 College of Agronomy, Northwest A&F University, Yangling 712100, China;
  • Received:2012-05-18 Revised:2012-10-05 Online:2013-03-12 Published:2012-12-11
  • Contact: 胡希远, E-mail: xiyuanhu@yahoo.com.cn; 王春平, E-mail: chunpingw@163.com

Abstract:

In order to study the heterogeneity state of error variance and its effect on the variety evaluation in corn regional trials, based on the 16 data sets of the corn regional trials in the Northeast and North China from 2003 to 2006, we assessed the error variation between the environments and the fit-goodness of models for homogeneous and heterogeneous errors, and compared the statistical tests for trial effects from the two models. The results showed that the error variance largely varied between environments in all of the considered trials. The model for heterogeneous errors fitted the trial data better than the model for homogeneous errors. Whether the heterogeneity of error variance was considered in the models considerably impacted the test about variety-environment interaction effects and little did the test about variety effects. The model for heterogeneous errors had higher test efficiency than the model for homogeneous errors.

Key words: Corn, Regional trial, Error variation, Model

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