Abstract
A two-stage approach is developed to describe plant response to interference in mixtures. In the first stage, a nonlinear model is used to define the monoculture yield-density response. The second stage extends the model to mixtures by defining the deviation from the monoculture state caused by interspecific interference. The approach is suggested for use with data from experimental designs involving correlated population density treatments. The approach is applicable where competition for resources is an important component of interference, and it can be used with multi-species associations. The model is suitable for the evaluation of crop-weed interactions, and for the assessment of differential yield responses in intercropping systems.
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