The purpose of this experiment was to measure the ability of species to invade an area with established individuals at different nitrogen levels. The experiment was located in the same fenced area as E018. The three nitrogen levels were N3*, N5, and N6 as defined in soil details. This experiment was divided into three sections, two types of invasions and monocultures as controls. The design was to plant four species in 1985 and in 1986 have each of the four established species be invaded by each of the three other species. There were four replicates of this section for a total of 144, 5-gallon pots. The four species are Agrostis scabra, Poa pratensis, Sorghastrum nutans, and Solidago nemoralis. The monocultures were the same four species listed above. The pots were sown at a density of about 50 plants per pot. The monocultures were sown again in the spring of 1986 to keep density of individuals the same as that in the invasion pots.