Genotype by tillage interaction and performance progress for bread and durum wheat genotypes on irrigated raised beds

Breeding progress was achieved irrespective of agronomic treatment. Tillage influenced plant growth and number of grains per m2 in both wheat types. In bread wheat, genotype by tillage interaction was significant for yield, test weight, and growth parameters. However, no cross-over effects were detected and rank changes were small. In durum wheat, genotype by tillage interaction was only significant for plant growth. The results do not indicate the need for separate breeding programs. However, the question of a need for selection under zero tillage to increase breeding progress is yet to be answered.