Abstract
Growth of Echinochloa crus-galli var. praticola (hereafter terms var. praticola) treated with herb extraction was evaluated to ascertain the allelopathetic effects by germination tests and pot experiments. The germination percentage of var. praticola seeds was dropped into a solution of Perilla, Applemint and Scented solomon's seal (top part) by distilled water, and also into a solution of Perilla, Gingko (pericarp), Oregano and six other herb species extracted with methanol (Table 1). The initial growth after germination was depressed by the solution of Honeysuckle, Applemint, Bergamot and Turmeric extracted with distilled water and the solution of Gingko (pericarp), perilla, Applemint and three other herb species extracted by methanol. The effects of small pieces of dried Honeysuckle and Applemint mixed with upper soil or full soil in the pot on the growth of var. praticola were then studied. The plant growth was depressed to 33.6% (23.0%) of the control plant in the upper soil (full soil) with 1.6% application of Honeysuckle plant pieces. Applemint caused 50.9% (40.8%) depression of growth in a 1.6% application to upper (full) soil (Table 2). The ability to depress plant growth became remarkable with increased application levels of materials. To determine the durability of effective depression of weed growth, var. praticola was cultivated again with the same soils after thee second experiment. Results showed effective weed depression at only 0.4% plots with upper or full soil for Honeysuckle, and there was little effect for Applemint (Table 3).
