100 cm, and the groundwater table depth is consistently below
25–30 m, so Q = 0; u0 and uh is the amount of soil moisture
stored at planting (mm) and harvesting (mm) based on the
mean value from the dry and wet root-zones for ADI and FDI
and the whole root-zone for CDI, respectively.
2.4. Physiological index measurement
Daily changes of net photosynthetic rate (Pn) and transpiration
rate (Tr) of three leaves per treatment were measured with a
portable photosynthesis system (ADC Bio-Scientific Ltd., UK)
in two representative sunny cloudless days at veraison stage
during 2005 and 2006. Leaf water use efficiency was calculated
with the carbon gained per unit of water loss.
Leaf water potential (CL) was measured synchronously
with a pressure chamber (3005 Plant Water Status Console,
Soil Moisture Equipment Corp., Santa Barbara, CA). Pre-dawn
and midday leaf water potential were also measured after the
fifth irrigation in 2005.