ABSTRACT
Competition is generally understood or refers to the negative effects on plant growth caused by the presence of neighbors, usually by reducing the availability of resources. Both the mechanisms and results of plant competition are crucial for food production. Most of the studies are focused on interspecific competition of crop and weeds and between intercrops, to a lesser extent. In agriculture, interspecific competition occurs between weeds and crop plants majorly, and between intercrops of different species, must also be considered. However, crop density and populations can also be optimized to suppress weed growth. The density and biodiversity of weeds will determine their ability to influence crop yield loss. Competition among crop plants is analyzed based on both the mechanisms and outcomes of the relationship. Competition indices are a means to quantify the results of competition. Moreover, these competition indices focus on interspecific competition between crops and weeds.
