Many factors influence the success of the two intercropped species, including light interception.
This experiment seeks to determine the effect of light as an energy limitation on biomass production of wheat and vetch and N-fixation of vetch. Pots were treated before planting with dicyandiamide to prevent nitrification. Vetch was inoculated with Rhizobium leguminosarum before planting. Plants were harvested periodically and dry weights were regressed against time to estimate relative growth rates. The coefficient of light intensity, while similar for both species, may reflect the transfer of photosynthetate to the symbiont, Rhizobium, in vetch.