Fig. 4

Number of experiments included in the map in terms of intervention form and experimental conditions. The physical form of intervention is the format in which allelopathy has been implemented in the experiment, coded in the database as either extracted allelochemicals, plant extracts or physical living plants. “Other” intervention forms refers to experiments where physical plants were tested in combination with plant extracts and/or extracted allelochemicals. The data is disaggregated by the experimental conditions