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Context-Dependent Allelopathic Interactions Between Winter Cereal Rye and Grain Legumes in Relay-Row Intercropping
Lina Šarūnaitė1, Rokas Antanynas1, Aušra Arlauskienė1
1Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry, LT-58344 Akademija, Lithuania.
Biology
|July 15, 2026
Summary
Allelopathic activity of rye and legumes did not suppress crop yields in organic intercropping. Resource competition and species compatibility were more important for crop performance in the field.
Area of Science:
- Agricultural Science
- Plant Science
- Ecology
Background:
- Plant interactions in agroecosystems involve biochemical interference (allelopathy) and resource competition.
- The relative importance of these mechanisms in field intercropping systems, especially under organic farming, is not well understood.
Purpose of the Study:
- To investigate the association between controlled allelopathic activity of winter cereal rye and grain legumes and their competitive outcomes in relay-row intercropping.
- To assess the influence of allelopathy versus resource partitioning on intercrop performance under organic farming conditions.
Main Methods:
- Greenhouse bioassays and laboratory screening assays were used to evaluate allelopathic potential.
- A field experiment under certified organic farming conditions assessed intercrop performance (biomass, land equivalent ratio).
- Secondary metabolite profiles of belowground biomass were analyzed.
Main Results:
- Aqueous leachates and biomass extracts showed time- and concentration-dependent biological activity on a recipient species in controlled conditions.
- Significant differences in secondary metabolite profiles were observed among species, especially in belowground biomass.
- Field intercropping did not result in persistent suppression of grain legumes; land equivalent ratios exceeded 1.0, indicating yield benefits.
Conclusions:
- Allelopathic effects detected in controlled environments did not translate to significant suppression in field intercropping under organic farming.
- Resource partitioning, species compatibility, and other ecological interactions appear to be more influential than allelopathy in determining intercrop performance.
- Cereal rye-lentil intercropping showed the highest land equivalent ratio, suggesting a beneficial combination.
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