Fig. 4.

Percentage of emerging and surviving seedlings when seeds were sown on the surface (A and B) or at the 10-mm depth (C–F) of sand (open symbols). The pots were irrigated initially with water of 16 mmP (A and C) or 8 mmP (B, D, E and F), and subsequently with 3 mmP at 1-d (A and C), 2-d (B and D), 4-d (E), or 6-d (F) intervals for 14 d. When seeds were sown on the sand surface, seeds were transferred to Petri dishes on day 14 and observed for another 10 d (the germination percentage is shown by filled symbols). When seeds were sown at the 10-mm depth and irrigated at 6-d intervals, seeds were irrigated with 8 mmP on day 14 and subsequently with 3 mmP at 1-d intervals for 10 d (F). Circles, A. squarrosum; squares, B. dasyphylla; triangles, A. adscensionis. Each point represents the mean of six replications; error bars indicating standard error are shown only where it was larger than the point size.