Treatments were three irrigation methods and five rates of Ca
fertilizer. This experimental plan yielded 15 treatments (i.e. 3
×
5)
and each treatment was replicated four times, totally 60 pots.
Irrigation methods included conventional irrigation (CI, soil was
evenly irrigated with tap water in each watering), alternate partial
root-zone irrigation (APRI, watering was alternately applied
to the two halves in the pot in consecutive watering) and fixed
partial root-zone irrigation (FPRI, watering was fixed to half of
the soil in the pot) (Li et al., 2007).