Hence, it is logical to think that as the density of the plant increases, the more intense the competition becomes. In fact, this was demonstrated by Kothari et al. (1974) on Dichanthium, a dominant perennial grass species. It was observed in the study that as the number of plants increased from 17 to 135 individuals per meter-squared of land, the mean dry weight and nitrogen content per D. significantly decreased as compared to the other set-ups with lower plant densities. Meanwhile, interspecific competition refers to the interaction between two different plant species vying for the same resources (Freedman, 2011). Crops interspersed with weeds would be a good example of interspecific competition. Those species equipped with the least capacity to compete for the same environmental supply has to adapt or die eventually (Went, 1973).
One of the earliest experimental investigations which cataloged the existence of competition within the floral community was conducted by Clements et al. (1929). Clements and his team planted sunflower, wheat, potatoes, and other plant species in varying distances with each other. Height (cm), leaf area (cm2), and dry weight (g) were then taken 80 days after planting (Clements et al., 1929). The results of the experiment indicated that the closer the plants are to each other, the more apparent growth inhibition becomes. Interestingly, increasing the number of plants per plot resulted in an overall production reaching a maximum value, which did not change even if spacing was decreased (Clements et al., 1929). It was also noted that the growth of all plants within the same plot. .The linear equation showed a positive slope, indicative of competition between millet and tomatoes. .