Grain peas are a valuable feed crop containing around 20% crude protein. Cultivated as pure crop, grain peas are prone to lodging which often leads to late weed infestation, soil contaminated grains and yield loss.
The barley provides support to the peas, preventing lodging and, thus, reduces yield loss. It increases the soil cover and thus suppresses weeds. Growing two crops at the same time also mitigates the risk of yield loss in one of the crops. With intercropping there is a higher land utilisation per hectare than with pure stand.
Matthias Klaiss, FiBL Switzerland
zenodo.org: Practice abstract "Intercropping grain peas with barley"