@phdthesis{oai:tsukuba.repo.nii.ac.jp:00008588,
 author = {Tongma, Suthep},
 month = {},
 note = {In natural plant gommunities, the megative effects of a plant on its neighbors are frequently observed. The plant may compete for light, water and nutrients in order to survive or dominate for succession. The most common interference among plants is found in agricultural ecosystems, especially the competition between weeds and crops. In some monoculture crops and a variety of forage crops, although the optimum essential resources are available or properly supplied ..., 1998},
 school = {筑波大学, University of Tsukuba},
 title = {Studies on allelopathic potential of Tithonia diversifolia in soil},
 year = {1999}
}