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The aim of this study was to verify whether using the Papadakis method improves model assumptions and experimental accuracy in field trials used to determine grain yield for wheat lineages indifferent Value for Cultivation and Use (VCU) regions. Grain yield data from 572 field trials at 31 locations in the VCU Regions 1, 2, 3 and 4 in 2007-2011 were used. Each trial was run with and without the use of the Papadakis method. The Papadakis method improved the indices of experimental precision measures and reduced the number of experimental repetitions required to predict grain yield performance among the wheat genotypes. There were differences among the wheat adaptation regions in terms of the efficiency of the Papadakis method, the adjustment coefficient of the genotype averages and the increases in the selective accuracy of grain yield.

CD 1104 is a cultivar indicated for the wheat-producing regions 1, 2, 3, 4 (irrigated) and 4 (rainfed) of the states of RS, SC, PR, SP, MS, MG, DF, GO, and MT. Its suitability for the industrial segment of strong flours and yield potential (mean of 4.427 kg ha-1) are high.

CD 1805, indicated for the wheat growing in Regions 1, 2 and 3 in the states of Rio Grande do Sul, Santa Catarina and Paraná. The cultivar has quality standards for cookie production and high yield performance with a mean of 3899 kg ha-1, exceeding the controls by 4%.

Cultivar CD 1550 is well-suited for the wheat-growing regions 1 and 2 of Rio Grande do Sul, Santa Catarina and Paraná and 3 of Paraná. It has the characteristics of bread wheat and high gluten strength. The average potential yield is 3828 kg ha-1, 7% higher than that of the controls.

The cultivar CD 120, developed by the Cooperativa Central de Pesquisa Agrícola (COODETEC) is suitable for cultivation in the VCU wheat-producing regions 1 and 2 of the states of Paraná, Santa Catarina and Rio Grande do Sul. It is tolerant to the major wheat diseases and pre-harvest germination and has soft wheat quality and a 6.5 % higher grain yield (3.678 kg ha-1) than the control.

Cultivar CD 123 is recommendable for the wheat-growing regions 1, 2 and 3 of the States of Rio Grande do Sul, Santa Catarina and Paraná. It is a white flour wheat destined for production in cooler regions. The mean potential yield is 3514 kg ha-1, exceeding that of the control cultivars by 5%.

The cultivar CD 122 was tested in the wheat-producing regions VCU 1, 2 and 3, with an average grain yield of 3,527 kg ha-1 when fungicide-treated, exceeding the average of the control cultivars by 5%. CD 122 is resistant to leaf rust and was classified as bread wheat.

The cultivar CD 115 was developed by the Cooperativa Central de Pesquisa Agrícola (COODETEC) and isrecommended for cultivation in the states of Rio Grande do Sul, Santa Catarina and Paraná. The cultivar is tolerant todiseases and pre-harvest sprouting. The mean grain yield in four years of evaluation was 3,420 kg ha-1, exceeding thecontrols by 7%.

CD 121 is indicated for wheat regions with the classification Value for Cultivation and Use 1 and 2, in the states of PR,SC and RS. The cultivar is tolerant to leaf rust, has good agronomic traits, flour suited for cookie baking and an average grain yieldof 3.622 kg ha-1.

The industrial quality and lodging resistance of CD 150, a cross between CD104 and CD108, are high and the plant heightis short. The average yield was 10 % higher than of the controls in the regions II, III and IV. It is suitable for cultivation in the states of PR,SP, MS and GO, MG, and DF.

Cultivar CD 116 was developed by the Cooperativa Central de Pesquisa Agrícola (COODETEC) and issuitable for cultivation in the states of Paraná, São Paulo, Mato Grosso do Sul, Mato Grosso, Minas Gerais, Goiás, andDistrito Federal. CD 116 is tolerant to the major diseases, particularly blast, has a high industrial grain quality and meanyield of 3908 kg ha-1, exceeding the control cultivars by 6%.