Picture 2. Harvest of a wheat crop in an 8-year-old poplar-cereal
intercropping system in the South of France. The poplar density is
75% of the density of a forestry plantation, and wheat is grown on
85% of the plot area, resulting in a high relative density, indicating
a design that is closer to an additive than a substitutive design. The
land equivalent ratio (LER) is over 1.3.