What is annidation and allelopathy ? What is Annidation ? The complimentary interaction between intercrops in the intercrop ping system is known as Annidation When plants are grown as compo nents of intercropping system, interactions between the component spe cies occur. Such interactions are essentially the response of one crop spe cies to the environment as modified by the presence of another species. One component species helps the other. Annidation occurs both in space and time. (a) Spatial Annidation (Annidation in Space) : Here the complimentary interactions between the intercrops occur with regard to spatial position (space/place). This principle is used in Multistorey cropping. The component species occupy different vertical layers by spread ing out their canopies or roots either in air or in soil. As far as aerial annidation is concerned the taller intercrops occupy higher vertical layers and shorter intercrops the lower layers. Such taller compo...