Allelopathic Effects of Water Extractions from Kummerowia striata on 4 Kinds of Turf Grass

To explore the allelopathic effects and mechanisms of water extractions from different parts of Kummerowia striata on different receiving turf grass: Festuca arundinacea, Lolium perenne, Cynodon dactylon and Trifolium repens. The Petri-dishes and filter-papers method was used to study the effects of water extractions from shearing whole plant, whole plant, leaves, stems, roots and the aboveground part of Kummerowia striata with different concentrations of 0.012 5 g/mL, 0.025 g/mL and 0.05 g/mL on seed germination rate, seed germination speed, seedling root, seedling shoot of the 4 receiving turf grass. The results showed that the seed germination and the seedling growth of the four tested plants are strongly suppressed by Kummerowia striata water extraction. The inhibition to the four receptors' seed germination ratio is Cynodon dactylonTrifolium repens Lolium perenne Festuca arundinacea; the inhibition to the seed germination rate is Lolium perenne Festuca arundinacea Cynodon dactylon Trifolium repens; the inhibition to the height of the seedlings is Lolium perenneTrifolium repensCynodon dactylonFestuca arundinacea; and the inhibition to the root length of seedlings is Trifolium repens Lolium perenne Cynodon dactylon Festuca arundinacea. The four tested plants are strongly constrained by Kummerowia striata water extraction. The synthetical effect(SE) of Festuca arundinacea is the weakest. The inhibition enhanced as the concentration increased. Under the same concentration, the inhibition of water extraction of the leaves and the sheared whole plant is stronger than that of the unsheared whole plant, the stems, the root and the aboveground part. The seed germination and the seedling growth of Festuca arundinacea, Lolium perenne and Cynodon dactylon received the strongest inhibition from Kummerowia striata water extraction extracted from leaves under 0.05 g/mL.And Trifolium repens suffered the strongest inhibition under 0.05 g/mL extraction from the sheared whole plant.