cc_by-nc-ndPrus, Maryna2025-06-062025-06-062025https://doi.org/10.1111/stan.12353https://hohpublica.uni-hohenheim.de/handle/123456789/17673The subject of this work is the allocation of trials to subregions in crop variety testing in the case of correlated genotype effects. A solution for computation of optimal allocations using the OptimalDesign package in R is proposed. The obtained optimal designs minimize linear criteria based on the mean squared error matrix of the best linear unbiased prediction of the genotype effects. The proposed computational approach allows for any kind of additional linear constraint on the designs. The results are illustrated by a real data example.engBest linear unbiased predictionCorrelated genotype effectsExperimental designLinear mixed modelMulti‐environment trialsOptimal design630Article2025-05-13