Abstract:In order to reveal the effect of environment condition on seed germination of Sorghum halepense, its germination characters were studied in Hainan Island. The results showed that the germination rate of S. halepense seeds was high with more than 85%, and the germination time was the shortest (2.64 d) under day and night temperature at 35℃/25℃. The seeds treated with 98% concentrated sulfuric acid could improve germination rate. The seed germination time was shortened treated with concentrated sulfuric acid, gibberellin and grinding. The seeds on the soil surface had the highest germination rate, and germination rate decreased and germination time increased with burial depth. Among different treatments, such as temperature, dormancy breaking and burial depth, there were no significant differences in germination rate and germination time of S. halepense seeds between outbreaking and non-outbreaking regions. Therefore, environmental conditions could influence germination of S. halepense seeds, and the seeds under high temperature and on the soil surface had high germination rate and short germination time. Seeds of S. halepense in Hainan Island had high germination rate and wide ecological breadth of germination, which was one of important reasons for its sudden disaster in Hainan in recent years. So, the strengthen control before flowering of S. halepense, reduce seed maturation and dissemination.
