Effects of temperature and calcium chloride on seed germination of ryegrass

To explore the ecological adaptability of ryegrass (Lolium perenne) to the calcium-rich environment in limestone areas, seed germination experiments were conducted. The effects of temperature and calcium chloride on seed germination of ryegrass were studied by investigating the different temperatures and concentrations of calcium chloride. The results showed that under certain temperatures, the germination rate, germination potential, and germination index of ryegrass treated with calcium chloride concentrations (≤ 1.5%) were generally high, whereas high concentrations (≥ 2.0%) of calcium chloride had obvious inhibitory effects (P < 0.05). Temperature had little effect on seed germination of perennial ryegrass under low calcium chloride concentration. The optimal temperature for the seed germination of ryegrass under high concentrations (≥ 2.0%) of calcium chloride was 15 ℃/25 ℃. The results enrich the research on the ecological adaptability of ryegrass, and provide a theoretical basis for ecological restoration, land use, and water and soil conservation in limestone areas.