Grain yield and interspecific competition in an oat-common vetch intercropping system at varying sowing density.

RVI showed an increasing trend with an increase in oat density, with the ID5 treatment being significantly higher than ID1 over the two years, with an increase ranging from 6.08% to 7.45%. 3.4 Competition indices under the oat-common vetch intercropping systems In the two-year study, aggressivity of oats is consistently positive (0.29–0.41), while common vetch exhibits negative aggressivity values (-0.29–0.41), indicating that oats are the dominant crop in the intercropping system ( Figure 3 ).

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The LER of the intercropping system showed a trend of an initial increase and subsequent decrease with increasing oat sowing density.

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