Fig. 2.
Differences in germination behaviour of seeds sown on 10 April in Valencia (Spain) (A) Each line represents the progress towards germination (hydrothermal units) of seeds with different genetic backgrounds (different values of initial dormancy, ψi) where each line is the average of 10 runs. Small differences due to the initial dormancy value can lead to qualitatively different behaviour. The low (L, blue line) and medium (M, purple line) dormant seeds both germinate in early autumn while the highly (H, green line) dormant seeds miss the favourable autumn season and germinate in the spring in the following year (see also (B)) (B) Temperature and moisture (determinants of germination) during the same period in Valencia. Wet hours is the number of hours per month with at least some moisture in the soil. This is for illustration only and for the simulations in (A) the hourly values of soil moisture were used instead. The black line is the monthly average temperature as used in the simulation of development in (A).