R help - Mar 2019 - Analysing diallel and line x tester mating design with multiple location in R

Hi Gbemisola,
You can find functions for diallel analysis (Griffing and Hayman) and
LxT analysis in several R packages:
agricolae (on CRAN),
DiallelAnalysisR (on CRAN),
plantbreeding (on R-forge), and
AGD-R (on the CIMMYT website; a front-end built on R).

If these are not enough (!) you could try other stand-alone software,
such as: PBTOOLS, GENES, QGAStation, TNAUSTAT, ICRISAT Genstat
scripts, GSCA (not free), or Dial98.

HTH, Cheers
David Luckett
djluckett at gmail.com
0408 750 703