Relative Performance of Ontario Soybean Cultivars and Differential Selection of Early Soybean Breeding Lines in Organic versus Conventional Production Systems




Boyle, Torin

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University of Guelph


Organic production systems differ from the conventional for insect pest, weed, disease, and nutrient management. The objective of this thesis was to determine if soybean cultivars and breeding lines responded differently in organic vs. conventional production systems. An F5/F6 generation breeding trial from two bi-parental soybean crosses and a replicated cultivar trials were conducted on an organic farm and conventional research station in the maturity group 0 zone of Southern Ontario. When thirty and thirty-three cultivars were tested in 2014 and 2015, respectively, significant crossover effects between environments indicated a differential cultivar performance between the production systems. GxT Biplots showed that the traits related to resource acquisition were associated with yield in the organic environment rather than nutrient re-mobilization. It was concluded that setting up a separate breeding program targeting an organic production system may lead to the development of a greater number of high yielding organic-adapted cultivars.



Soybean, Plant Breeding, Agronomy, Organic Agriculture