Black walnut trees (Juglans nigra) produce a chemical called juglone in many parts of the tree, including the roots. In

Black walnut trees (Juglans nigra) produce a chemical called juglone in many parts of the tree, including the roots. In producing the chemical the tree is able to decrease growth of some plants around the tree (from the trunk outward to the drip line/edge of canopy). This is considered allelopathy, would be an example of what type of competition


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