Abstract
A model is presented explaining those mixing effects in cereal cultivar blends that cannot be attributed to reduced disease levels but are thought to result from improved compensatory reactions to environmental stress in cereal cultivar blends. Cultivars are characterized by the slopes b and deviation mean squares s d 2 of linear regressions of their individual pure stand performance on the means of all pure cultivars. It is assumed that a cultivar 1 which yields less than expected in a particular environment does not utilize all growth factors available. The amount of growth factors not utilized is postulated to be taken up by the other mixture component which then produces more than expected in pure stand. It is hypothesized that this additional ‘compensatory’ yield is what is usually named the mixing effect. Two variants of the hypothesis; namely, one-sided and two-sided compensation, are investigated using results from field experiments with winter barley.
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